Use (derived-mode-p 'org-mode) instead of (eq major-mode 'org-mode).

* org.el (org-show-hierarchy-above, org-cycle)
(org-global-cycle, org-files-list, org-store-link)
(org-link-search, org-open-file, org-display-outline-path)
(org-refile-get-location, org-update-all-dblocks)
(org-change-tag-in-region, org-entry-properties)
(org-save-all-org-buffers, org-revert-all-org-buffers)
(org-buffer-list, org-cdlatex-mode)
(org-install-agenda-files-menu, org-end-of-subtree)
(org-speedbar-set-agenda-restriction): Use (derived-mode-p
'org-mode) instead of (eq major-mode 'org-mode).

* org-timer.el (org-timer-set-timer): Ditto.

* org-table.el (orgtbl-mode, org-table-align, orgtbl-mode): Ditto.

* org-src.el (org-edit-src-exit, org-edit-src-code)
(org-edit-fixed-width-region, org-edit-src-exit): Ditto.

* org-remember.el (org-remember-handler): Ditto.

* org-mouse.el (dnd-open-file, org-mouse-insert-item): Ditto.

* org-macs.el (org-get-limited-outline-regexp): Ditto.

* org-lparse.el (org-replace-region-by): Ditto.

* org-latex.el (org-latex-to-pdf-process)
(org-replace-region-by-latex): Ditto.

* org-indent.el (org-indent-indent-buffer): Ditto.

* org-id.el (org-id-store-link, org-id-update-id-locations)
(org-id-store-link): Ditto.

* org-html.el (org-export-html-preprocess)
(org-replace-region-by-html): Ditto.

* org-footnote.el (org-footnote-normalize)
(org-footnote-goto-definition)
(org-footnote-create-definition, org-footnote-normalize): Ditto.

* org-docbook.el (org-replace-region-by-docbook): Ditto.

* org-ctags.el (find-tag): Ditto.

* org-colview.el (org-columns-redo)
(org-columns-display-here, org-columns-edit-value)
(org-columns-redo): Ditto.

* org-colview-xemacs.el (org-columns-redo)
(org-columns-display-here, org-columns-edit-value)
(org-columns-redo): Ditto.

* org-capture.el (org-capture-insert-template-here)
(org-capture, org-capture-finalize)
(org-capture-set-target-location)
(org-capture-insert-template-here): Ditto.

* org-ascii.el (org-replace-region-by-ascii):  Ditto.

* org-archive.el (org-archive-subtree): Ditto.

* org-agenda.el (org-agenda)
(org-agenda-get-restriction-and-command)
(org-agenda-get-some-entry-text, org-search-view)
(org-tags-view, org-agenda-get-day-entries)
(org-agenda-format-item, org-agenda-goto, org-agenda-kill)
(org-agenda-archive-with, org-agenda-switch-to): Ditto.

lisp/org-agenda.el

@@ -2460,7 +2460,7 @@ Pressing `<' twice means to restrict to the current subtree or region
 			       nil 'face 'org-warning)))))))
 	 t t))
        ((equal keys "L")
-	(unless (eq major-mode 'org-mode)
+	(unless (derived-mode-p 'org-mode)
 	  (error "This is not an Org-mode file"))
 	(unless restriction
 	  (put 'org-agenda-files 'org-restrict (list bfn))
@@ -2495,7 +2495,7 @@ Agenda views are separated by `org-agenda-block-separator'."
   "The user interface for selecting an agenda command."
   (catch 'exit
     (let* ((bfn (buffer-file-name (buffer-base-buffer)))
-	   (restrict-ok (and bfn (eq major-mode 'org-mode)))
+	   (restrict-ok (and bfn (derived-mode-p 'org-mode)))
 	   (region-p (org-region-active-p))
 	   (custom org-agenda-custom-commands)
 	   (selstring "")
@@ -3041,7 +3041,7 @@ removed from the entry content.  Currently only `planning' is allowed here."
   (let (txt drawer-re kwd-time-re ind)
     (save-excursion
       (with-current-buffer (marker-buffer marker)
-	(if (not (eq major-mode 'org-mode))
+	(if (not (derived-mode-p 'org-mode))
 	    (setq txt "")
 	  (save-excursion
 	    (save-restriction
@@ -3157,7 +3157,7 @@ removed from the entry content.  Currently only `planning' is allowed here."
 
 (defun org-check-for-org-mode ()
   "Make sure current buffer is in org-mode.  Error if not."
-  (or (eq major-mode 'org-mode)
+  (or (derived-mode-p 'org-mode)
       (error "Cannot execute org-mode agenda command on buffer in %s"
 	     major-mode)))
 
@@ -4109,7 +4109,7 @@ in `org-agenda-text-search-extra-files'."
 				    file))))
 	(with-current-buffer buffer
 	  (with-syntax-table (org-search-syntax-table)
-	    (unless (eq major-mode 'org-mode)
+	    (unless (derived-mode-p 'org-mode)
 	      (error "Agenda file %s is not in `org-mode'" file))
 	    (let ((case-fold-search t))
 	      (save-excursion
@@ -4302,7 +4302,7 @@ The prefix arg TODO-ONLY limits the search to TODO entries."
 		       (format "ORG-AGENDA-ERROR: No such org-file %s" file))
 		  rtnall (append rtnall rtn))
 	  (with-current-buffer buffer
-	    (unless (eq major-mode 'org-mode)
+	    (unless (derived-mode-p 'org-mode)
 	      (error "Agenda file %s is not in `org-mode'" file))
 	    (save-excursion
 	      (save-restriction
@@ -4762,7 +4762,7 @@ the documentation of `org-diary'."
 	;; If file does not exist, make sure an error message ends up in diary
 	(list (format "ORG-AGENDA-ERROR: No such org-file %s" file))
       (with-current-buffer buffer
-	(unless (eq major-mode 'org-mode)
+	(unless (derived-mode-p 'org-mode)
 	  (error "Agenda file %s is not in `org-mode'" file))
 	(let ((case-fold-search nil))
 	  (save-excursion
@@ -5744,7 +5744,7 @@ Any match of REMOVE-RE will be removed from TXT."
 	     (time-of-day (and dotime (org-get-time-of-day ts)))
 	     stamp plain s0 s1 s2 rtn srp l
 	     duration thecategory)
-	(and (eq major-mode 'org-mode) buffer-file-name
+	(and (derived-mode-p 'org-mode) buffer-file-name
 	     (add-to-list 'org-agenda-contributing-files buffer-file-name))
 	(when (and dotime time-of-day)
 	  ;; Extract starting and ending time and move them to prefix
@@ -5792,7 +5792,7 @@ Any match of REMOVE-RE will be removed from TXT."
 		       (concat (make-string (max (- 50 (length txt)) 1) ?\ )
 			       (match-string 2 txt))
 		       t t txt))))
-	(when (eq major-mode 'org-mode)
+	(when (derived-mode-p 'org-mode)
 	  (setq effort
 		(condition-case nil
 		    (org-get-effort
@@ -7230,7 +7230,7 @@ and by additional input from the age of a schedules or deadline entry."
     (widen)
     (push-mark)
     (goto-char pos)
-    (when (eq major-mode 'org-mode)
+    (when (derived-mode-p 'org-mode)
       (org-show-context 'agenda)
       (save-excursion
 	(and (outline-next-heading)
@@ -7259,7 +7259,7 @@ Point is in the buffer where the item originated.")
      (with-current-buffer buffer
        (save-excursion
 	 (goto-char pos)
-	 (if (and (eq major-mode 'org-mode) (not (member type '("sexp"))))
+	 (if (and (derived-mode-p 'org-mode) (not (member type '("sexp"))))
 	     (setq dbeg (progn (org-back-to-heading t) (point))
 		   dend (org-end-of-subtree t t))
 	   (setq dbeg (point-at-bol)
@@ -7311,7 +7311,7 @@ Point is in the buffer where the item originated.")
 	 (pos (marker-position marker)))
     (org-with-remote-undo buffer
       (with-current-buffer buffer
-	(if (eq major-mode 'org-mode)
+	(if (derived-mode-p 'org-mode)
 	    (if (and confirm
 		     (not (y-or-n-p "Archive this subtree or entry? ")))
 		(error "Abort")
@@ -7416,7 +7416,7 @@ at the text of the entry itself."
       (and delete-other-windows (delete-other-windows))
       (widen)
       (goto-char pos)
-      (when (eq major-mode 'org-mode)
+      (when (derived-mode-p 'org-mode)
 	(org-show-context 'agenda)
 	(save-excursion
 	  (and (outline-next-heading)

lisp/org-archive.el

@@ -263,7 +263,7 @@ this heading."
 	  (let (this-command) (org-copy-subtree 1 nil t))
 	  (set-buffer buffer)
 	  ;; Enforce org-mode for the archive buffer
-	  (if (not (eq major-mode 'org-mode))
+	  (if (not (derived-mode-p 'org-mode))
 	      ;; Force the mode for future visits.
 	      (let ((org-insert-mode-line-in-empty-file t)
 		    (org-inhibit-startup t))

lisp/org-ascii.el

@@ -144,7 +144,7 @@ command to convert it."
   (interactive "r")
   (let (reg ascii buf pop-up-frames)
     (save-window-excursion
-      (if (eq major-mode 'org-mode)
+      (if (derived-mode-p 'org-mode)
 	  (setq ascii (org-export-region-as-ascii
 		      beg end t 'string))
 	(setq reg (buffer-substring beg end)

lisp/org-capture.el

@@ -496,7 +496,7 @@ bypassed."
 	     (error "Capture template `%s': %s"
 		    (org-capture-get :key)
 		    (nth 1 error))))
-	  (if (and (eq major-mode 'org-mode)
+	  (if (and (derived-mode-p 'org-mode)
 		   (org-capture-get :clock-in))
 	      (condition-case nil
 		  (progn
@@ -588,7 +588,7 @@ captured item after finalizing."
 	  (org-capture-empty-lines-after
 	   (or (org-capture-get :empty-lines 'local) 0))))
       ;; Postprocessing:  Update Statistics cookies, do the sorting
-      (when (eq major-mode 'org-mode)
+      (when (derived-mode-p 'org-mode)
 	(save-excursion
 	  (when (ignore-errors (org-back-to-heading))
 	    (org-update-parent-todo-statistics)
@@ -736,7 +736,7 @@ already gone.  Any prefix argument will be passed to the refile command."
 	(widen)
 	(let ((hd (nth 2 target)))
 	  (goto-char (point-min))
-	  (unless (eq major-mode 'org-mode)
+	  (unless (derived-mode-p 'org-mode)
 	    (error
 	     "Target buffer \"%s\" for file+headline should be in Org mode"
 	     (current-buffer)))
@@ -768,7 +768,7 @@ already gone.  Any prefix argument will be passed to the refile command."
 	      (goto-char (if (org-capture-get :prepend)
 			     (match-beginning 0) (match-end 0)))
 	      (org-capture-put :exact-position (point))
-	      (setq target-entry-p (and (eq major-mode 'org-mode) (org-at-heading-p))))
+	      (setq target-entry-p (and (derived-mode-p 'org-mode) (org-at-heading-p))))
 	  (error "No match for target regexp in file %s" (nth 1 target))))
 
        ((memq (car target) '(file+datetree file+datetree+prompt))
@@ -803,12 +803,12 @@ already gone.  Any prefix argument will be passed to the refile command."
 	(widen)
 	(funcall (nth 2 target))
 	(org-capture-put :exact-position (point))
-	(setq target-entry-p (and (eq major-mode 'org-mode) (org-at-heading-p))))
+	(setq target-entry-p (and (derived-mode-p 'org-mode) (org-at-heading-p))))
 
        ((eq (car target) 'function)
 	(funcall (nth 1 target))
 	(org-capture-put :exact-position (point))
-	(setq target-entry-p (and (eq major-mode 'org-mode) (org-at-heading-p))))
+	(setq target-entry-p (and (derived-mode-p 'org-mode) (org-at-heading-p))))
 
        ((eq (car target) 'clock)
 	(if (and (markerp org-clock-hd-marker)
@@ -1162,11 +1162,11 @@ Point will remain at the first line after the inserted text."
     (or (bolp) (newline))
     (setq beg (point))
     (cond
-     ((and (eq type 'entry) (eq major-mode 'org-mode))
+     ((and (eq type 'entry) (derived-mode-p 'org-mode))
       (org-capture-verify-tree (org-capture-get :template))
       (org-paste-subtree nil template t))
      ((and (memq type '(item checkitem))
-	   (eq major-mode 'org-mode)
+	   (derived-mode-p 'org-mode)
 	   (save-excursion (skip-chars-backward " \t\n")
 			   (setq pp (point))
 			   (org-in-item-p)))

lisp/org-colview-xemacs.el

@@ -353,7 +353,7 @@ This is the compiled version of the format.")
 			  (funcall org-columns-modify-value-for-display-function
 				   title val))
 			 ((equal property "ITEM")
-			  (if (eq major-mode 'org-mode)
+			  (if (derived-mode-p 'org-mode)
 			      (org-columns-cleanup-item
 			       val org-columns-current-fmt-compiled)))
 			 ((and calc (functionp calc)
@@ -657,7 +657,7 @@ Where possible, use the standard interface for changing this line."
 		(org-columns-eval eval))
 	    (org-columns-display-here)))
 	(org-move-to-column col)
-	(if (and (eq major-mode 'org-mode)
+	(if (and (derived-mode-p 'org-mode)
 		 (nth 3 (assoc key org-columns-current-fmt-compiled)))
 	    (org-columns-update key)))))))
 
@@ -1166,7 +1166,7 @@ Don't set this, this is meant for dynamic scoping.")
     (if (marker-position org-columns-begin-marker)
 	(goto-char org-columns-begin-marker))
     (org-columns-remove-overlays)
-    (if (eq major-mode 'org-mode)
+    (if (derived-mode-p 'org-mode)
 	(call-interactively 'org-columns)
       (org-agenda-redo)
       (call-interactively 'org-agenda-columns)))

lisp/org-colview.el

@@ -186,7 +186,7 @@ This is the compiled version of the format.")
 		    (cons "ITEM"
 			  ;; When in a buffer, get the whole line,
 			  ;; we'll clean it later…
-			  (if (eq major-mode 'org-mode)
+			  (if (derived-mode-p 'org-mode)
 			      (save-match-data
 				(org-no-properties
 				 (org-remove-tabs
@@ -499,7 +499,7 @@ Where possible, use the standard interface for changing this line."
 		(org-columns-eval eval))
 	    (org-columns-display-here)))
 	(org-move-to-column col)
-	(if (and (eq major-mode 'org-mode)
+	(if (and (derived-mode-p 'org-mode)
 		 (nth 3 (assoc key org-columns-current-fmt-compiled)))
 	    (org-columns-update key)))))))
 
@@ -1014,7 +1014,7 @@ Don't set this, this is meant for dynamic scoping.")
       (if (marker-position org-columns-begin-marker)
 	  (goto-char org-columns-begin-marker))
       (org-columns-remove-overlays)
-      (if (eq major-mode 'org-mode)
+      (if (derived-mode-p 'org-mode)
 	  (call-interactively 'org-columns)
 	(org-agenda-redo)
 	(call-interactively 'org-agenda-columns)))

lisp/org-ctags.el

@@ -309,7 +309,7 @@ The new topic will be titled NAME (or TITLE if supplied)."
 			    activate compile)
   "Before trying to find a tag, save our current position on org mark ring."
   (save-excursion
-    (if (and (eq major-mode 'org-mode) org-ctags-enabled-p)
+    (if (and (derived-mode-p 'org-mode) org-ctags-enabled-p)
         (org-mark-ring-push))))
 
 

lisp/org-docbook.el

@@ -295,7 +295,7 @@ then use this command to convert it."
   (interactive "r")
   (let (reg docbook buf)
     (save-window-excursion
-      (if (eq major-mode 'org-mode)
+      (if (derived-mode-p 'org-mode)
 	  (setq docbook (org-export-region-as-docbook
 			 beg end t 'string))
 	(setq reg (buffer-substring beg end)

lisp/org-footnote.el

@@ -361,7 +361,7 @@ Return a non-nil value when a definition has been found."
       (looking-at (format "\\[%s\\]\\|\\[%s:" label label))
       (goto-char (match-end 0))
       (org-show-context 'link-search)
-      (when (eq major-mode 'org-mode)
+      (when (derived-mode-p 'org-mode)
 	(message "Edit definition and go back with `C-c &' or, if unique, with `C-c C-c'."))
       t)))
 
@@ -488,7 +488,7 @@ or new, let the user edit the definition of the footnote."
   (let ((label (org-footnote-normalize-label label)))
     (cond
      ;; In an Org file.
-     ((eq major-mode 'org-mode)
+     ((derived-mode-p 'org-mode)
       ;; If `org-footnote-section' is defined, find it, or create it
       ;; at the end of the buffer.
       (when org-footnote-section
@@ -552,7 +552,7 @@ or new, let the user edit the definition of the footnote."
     (backward-char)
     ;; Only notify user about next possible action when in an Org
     ;; buffer, as the bindings may have different meanings otherwise.
-    (when (eq major-mode 'org-mode)
+    (when (derived-mode-p 'org-mode)
       (message
        "Edit definition and go back with `C-c &' or, if unique, with `C-c C-c'."))))
 
@@ -712,7 +712,7 @@ Additional note on `org-footnote-insert-pos-for-preprocessor':
       ;; 2. Find and remove the footnote section, if any.  Also
       ;;    determine where footnotes shall be inserted (INS-POINT).
       (cond
-       ((and org-footnote-section (eq major-mode 'org-mode))
+       ((and org-footnote-section (derived-mode-p 'org-mode))
 	(goto-char (point-min))
 	(if (re-search-forward
 	     (concat "^\\*[ \t]+" (regexp-quote org-footnote-section)
@@ -728,7 +728,7 @@ Additional note on `org-footnote-insert-pos-for-preprocessor':
        ;; of the section containing their first reference.
        ;; Nevertheless, in an export situation, set insertion point to
        ;; `point-max' by default.
-       ((eq major-mode 'org-mode)
+       ((derived-mode-p 'org-mode)
 	(when export-props
 	  (goto-char (point-max))
 	  (skip-chars-backward " \r\t\n")
@@ -789,7 +789,7 @@ Additional note on `org-footnote-insert-pos-for-preprocessor':
        ;; No footnote: exit.
        ((not ref-table))
        ;; Cases when footnotes should be inserted in one place.
-       ((or (not (eq major-mode 'org-mode))
+       ((or (not (derived-mode-p 'org-mode))
 	    org-footnote-section
 	    export-props)
 	;; Insert again the section title, if any.  Ensure that title,
@@ -798,7 +798,7 @@ Additional note on `org-footnote-insert-pos-for-preprocessor':
 	;; separate section with a blank line, unless explicitly
 	;; stated in `org-blank-before-new-entry'.
 	(cond
-	 ((not (eq major-mode 'org-mode))
+	 ((not (derived-mode-p 'org-mode))
 	  (skip-chars-backward " \t\n\r")
 	  (delete-region (point) ins-point)
 	  (unless (bolp) (newline))

lisp/org-html.el

@@ -751,7 +751,7 @@ command to convert it."
   (interactive "r")
   (let (reg html buf pop-up-frames)
     (save-window-excursion
-      (if (eq major-mode 'org-mode)
+      (if (derived-mode-p 'org-mode)
 	  (setq html (org-export-region-as-html
 		      beg end t 'string))
 	(setq reg (buffer-substring beg end)

lisp/org-id.el

@@ -431,7 +431,7 @@ When CHECK is given, prepare detailed information about duplicate IDs."
 		 (delq nil
 		       (mapcar (lambda (b)
 				 (with-current-buffer b
-				   (and (eq major-mode 'org-mode) (buffer-file-name))))
+				   (and (derived-mode-p 'org-mode) (buffer-file-name))))
 			       (buffer-list)))
 		 ;; All files known to have IDs
 		 org-id-files)))
@@ -600,7 +600,7 @@ optional argument MARKERP, return the position as a new marker."
 (defun org-id-store-link ()
   "Store a link to the current entry, using its ID."
   (interactive)
-  (when (and (buffer-file-name (buffer-base-buffer)) (eq major-mode 'org-mode))
+  (when (and (buffer-file-name (buffer-base-buffer)) (derived-mode-p 'org-mode))
     (let* ((link (org-make-link "id:" (org-id-get-create)))
 	   (case-fold-search nil)
 	   (desc (save-excursion

lisp/org-indent.el

@@ -223,7 +223,7 @@ during idle time." nil " Ind" nil
 (defun org-indent-indent-buffer ()
   "Add indentation properties to the accessible part of the buffer."
   (interactive)
-  (if (not (eq major-mode 'org-mode))
+  (if (not (derived-mode-p 'org-mode))
       (error "Not in Org mode")
     (message "Setting buffer indentation. It may take a few seconds...")
     (org-indent-remove-properties (point-min) (point-max))

lisp/org-latex.el

@@ -763,7 +763,7 @@ then use this command to convert it."
   (interactive "r")
   (let (reg latex buf)
     (save-window-excursion
-      (if (eq major-mode 'org-mode)
+      (if (derived-mode-p 'org-mode)
 	  (setq latex (org-export-region-as-latex
 		       beg end t 'string))
 	(setq reg (buffer-substring beg end)

lisp/org-lparse.el

@@ -101,7 +101,7 @@ itemized list in org-mode syntax in an HTML buffer and then use
 this command to convert it."
   (let (reg backend-string buf pop-up-frames)
     (save-window-excursion
-      (if (eq major-mode 'org-mode)
+      (if (derived-mode-p 'org-mode)
 	  (setq backend-string (org-lparse-region backend beg end t 'string))
 	(setq reg (buffer-substring beg end)
 	      buf (get-buffer-create "*Org tmp*"))

lisp/org-macs.el

@@ -384,7 +384,7 @@ point nowhere."
 (defun org-get-limited-outline-regexp ()
   "Return outline-regexp with limited number of levels.
 The number of levels is controlled by `org-inlinetask-min-level'"
-  (if (or (not (eq major-mode 'org-mode)) (not (featurep 'org-inlinetask)))
+  (if (or (not (derived-mode-p 'org-mode)) (not (featurep 'org-inlinetask)))
       org-outline-regexp
     (let* ((limit-level (1- org-inlinetask-min-level))
 	   (nstars (if org-odd-levels-only (1- (* limit-level 2)) limit-level)))

lisp/org-mouse.el

@@ -597,12 +597,12 @@ This means, between the beginning of line and the point."
   (beginning-of-line))
 
 (defadvice dnd-insert-text (around org-mouse-dnd-insert-text activate)
-  (if (eq major-mode 'org-mode)
+  (if (derived-mode-p 'org-mode)
       (org-mouse-insert-item text)
     ad-do-it))
 
 (defadvice dnd-open-file (around org-mouse-dnd-open-file activate)
-  (if (eq major-mode 'org-mode)
+  (if (derived-mode-p 'org-mode)
       (org-mouse-insert-item uri)
     ad-do-it))
 

lisp/org-remember.el

@@ -943,7 +943,7 @@ See also the variable `org-reverse-note-order'."
 	(throw 'quit t))
       ;; Find the file
       (with-current-buffer (or visiting (find-file-noselect file))
-	(unless (or (eq major-mode 'org-mode) (member heading '(top bottom)))
+	(unless (or (derived-mode-p 'org-mode) (member heading '(top bottom)))
 	  (error "Target files for notes must be in Org-mode if not filing to top/bottom"))
 	(save-excursion
 	  (save-restriction
@@ -953,7 +953,7 @@ See also the variable `org-reverse-note-order'."
 	    ;; Find the default location
 	    (when heading
 	      (cond
-	       ((not (eq major-mode 'org-mode))
+	       ((not (derived-mode-p 'org-mode))
 		(if (eq heading 'top)
 		    (goto-char (point-min))
 		  (goto-char (point-max))

lisp/org-src.el

@@ -311,7 +311,7 @@ buffer."
 	     (error "Language mode `%s' fails with: %S" lang-f (nth 1 e)))))
 	(dolist (pair transmitted-variables)
 	  (org-set-local (car pair) (cadr pair)))
-	(if (eq major-mode 'org-mode)
+	(if (derived-mode-p 'org-mode)
 	    (progn
 	      (goto-char (point-min))
 	      (while (re-search-forward "^," nil t)
@@ -415,7 +415,7 @@ the fragment in the Org-mode buffer."
 	(case-fold-search t)
 	(msg (substitute-command-keys
 	      "Edit, then exit with C-c ' (C-c and single quote)"))
-	(org-mode-p (eq major-mode 'org-mode))
+	(org-mode-p (derived-mode-p 'org-mode))
 	(beg (make-marker))
 	(end (make-marker))
 	(preserve-indentation org-src-preserve-indentation)
@@ -634,7 +634,7 @@ the language, a switch telling if the content should be in a single line."
       (when (org-bound-and-true-p org-edit-src-from-org-mode)
 	(goto-char (point-min))
 	(while (re-search-forward
-		(if (eq major-mode 'org-mode) "^\\(.\\)" "^\\([*]\\|[ \t]*#\\+\\)") nil t)
+		(if (derived-mode-p 'org-mode) "^\\(.\\)" "^\\([*]\\|[ \t]*#\\+\\)") nil t)
 	  (if (eq (org-current-line) line) (setq delta (1+ delta)))
 	  (replace-match ",\\1")))
       (when (org-bound-and-true-p org-edit-src-picture)

lisp/org-table.el

@@ -833,7 +833,7 @@ When nil, simply write \"#ERROR\" in corrupted fields.")
     (delete-region (point) end)
     (move-marker end nil)
     (move-marker org-table-aligned-end-marker (point))
-    (when (and orgtbl-mode (not (eq major-mode 'org-mode)))
+    (when (and orgtbl-mode (not (derived-mode-p 'org-mode)))
       (goto-char org-table-aligned-begin-marker)
       (while (org-hide-wide-columns org-table-aligned-end-marker)))
     ;; Try to move to the old location
@@ -3851,7 +3851,7 @@ Use COMMAND to do the motion, repeat if necessary to end up in a data line."
   :lighter " OrgTbl" :keymap orgtbl-mode-map
   (org-load-modules-maybe)
   (cond
-   ((eq major-mode 'org-mode)
+   ((derived-mode-p 'org-mode)
     ;; Exit without error, in case some hook functions calls this
     ;; by accident in org-mode.
     (message "Orgtbl-mode is not useful in org-mode, command ignored"))

lisp/org-timer.el

@@ -407,7 +407,7 @@ replace any running timer."
 		     (org-show-entry)
 		     (or (ignore-errors (org-get-heading))
 			 (concat "File:" (file-name-nondirectory (buffer-file-name)))))))
-		((eq major-mode 'org-mode)
+		((derived-mode-p 'org-mode)
 		 (or (ignore-errors (org-get-heading))
 		     (concat "File:" (file-name-nondirectory (buffer-file-name)))))
 		(t (error "Not in an Org buffer"))))

lisp/org.el

@@ -4523,7 +4523,7 @@ but the stars and the body are.")
 
 (defun org-set-regexps-and-options ()
   "Precompute regular expressions for current buffer."
-  (when (eq major-mode 'org-mode)
+  (when (derived-mode-p 'org-mode)
     (org-set-local 'org-todo-kwd-alist nil)
     (org-set-local 'org-todo-key-alist nil)
     (org-set-local 'org-todo-key-trigger nil)
@@ -6176,7 +6176,7 @@ in special contexts.
 			  (and limit-level (1- (* limit-level 2)))
 			limit-level)))
 	   (org-outline-regexp
-	    (if (not (eq major-mode 'org-mode))
+	    (if (not (derived-mode-p 'org-mode))
 		outline-regexp
 	      (concat "\\*" (if nstars (format "\\{1,%d\\} " nstars) "+ "))))
 	   (bob-special (and org-cycle-global-at-bob (not arg) (bobp)
@@ -6422,7 +6422,7 @@ With \\[universal-argument] prefix arg, switch to startup visibility.
 With a numeric prefix, show all headlines up to that level."
   (interactive "P")
   (let ((org-cycle-include-plain-lists
-	 (if (eq major-mode 'org-mode) org-cycle-include-plain-lists nil)))
+	 (if (derived-mode-p 'org-mode) org-cycle-include-plain-lists nil)))
     (cond
      ((integerp arg)
       (show-all)
@@ -6632,7 +6632,7 @@ open and agenda-wise Org files."
   (let ((files (mapcar 'expand-file-name (org-agenda-files))))
     (dolist (buf (buffer-list))
       (with-current-buffer buf
-	(if (and (eq major-mode 'org-mode) (buffer-file-name))
+	(if (and (derived-mode-p 'org-mode) (buffer-file-name))
 	    (let ((file (expand-file-name (buffer-file-name))))
 	      (unless (member file files)
 		(push file files))))))
@@ -6648,7 +6648,7 @@ open and agenda-wise Org files."
 
 (defun org-cycle-hide-drawers (state)
   "Re-hide all drawers after a visibility state change."
-  (when (and (eq major-mode 'org-mode)
+  (when (and (derived-mode-p 'org-mode)
 	     (not (memq state '(overview folded contents))))
     (save-excursion
       (let* ((globalp (memq state '(contents all)))
@@ -8783,7 +8783,7 @@ For file links, arg negates `org-context-in-file-links'."
 	 (setq cpltxt (concat "file:" file)
 	       link (org-make-link cpltxt))))
 
-      ((and (buffer-file-name (buffer-base-buffer)) (eq major-mode 'org-mode))
+      ((and (buffer-file-name (buffer-base-buffer)) (derived-mode-p 'org-mode))
        (setq custom-id (org-entry-get nil "CUSTOM_ID"))
        (cond
 	((org-in-regexp "<<\\(.*?\\)>>")
@@ -9961,12 +9961,12 @@ visibility around point, thus ignoring
      ((string-match "^/\\(.*\\)/$" s)
       ;; A regular expression
       (cond
-       ((eq major-mode 'org-mode)
+       ((derived-mode-p 'org-mode)
 	(org-occur (match-string 1 s)))
        ;;((eq major-mode 'dired-mode)
        ;; (grep (concat "grep -n -e '" (match-string 1 s) "' *")))
        (t (org-do-occur (match-string 1 s)))))
-     ((and (eq major-mode 'org-mode) org-link-search-must-match-exact-headline)
+     ((and (derived-mode-p 'org-mode) org-link-search-must-match-exact-headline)
       (and (equal (string-to-char s) ?*) (setq s (substring s 1)))
       (goto-char (point-min))
       (cond
@@ -10034,7 +10034,7 @@ visibility around point, thus ignoring
 	      (goto-char (match-beginning 1))
 	    (goto-char pos)
 	    (error "No match"))))))
-    (and (eq major-mode 'org-mode)
+    (and (derived-mode-p 'org-mode)
 	 (not stealth)
 	 (org-show-context 'link-search))
     type))
@@ -10305,7 +10305,7 @@ If the file does not exist, an error is thrown."
 	  (set-match-data link-match-data)
 	  (eval cmd))))
      (t (funcall (cdr (assq 'file org-link-frame-setup)) file)))
-    (and (eq major-mode 'org-mode) (eq old-mode 'org-mode)
+    (and (derived-mode-p 'org-mode) (eq old-mode 'org-mode)
 	 (or (not (equal old-buffer (current-buffer)))
 	     (not (equal old-pos (point))))
 	 (org-mark-ring-push old-pos old-buffer))))
@@ -10629,7 +10629,7 @@ such as the file name."
   (interactive "P")
   (let* ((bfn (buffer-file-name (buffer-base-buffer)))
 	 (case-fold-search nil)
-	 (path (and (eq major-mode 'org-mode) (org-get-outline-path))))
+	 (path (and (derived-mode-p 'org-mode) (org-get-outline-path))))
     (if current (setq path (append path
 				   (save-excursion
 				     (org-back-to-heading t)
@@ -10817,7 +10817,7 @@ this is used for the GOTO interface."
   (let ((org-refile-targets org-refile-targets)
 	(org-refile-use-outline-path org-refile-use-outline-path)
 	excluded-entries)
-    (when (and (eq major-mode 'org-mode)
+    (when (and (derived-mode-p 'org-mode)
 	       (not org-refile-use-cache)
 	       (not no-exclude))
       (org-map-tree
@@ -11099,7 +11099,7 @@ Error if there is no such block at point."
   "Update all dynamic blocks in the buffer.
 This function can be used in a hook."
   (interactive)
-  (when (eq major-mode 'org-mode)
+  (when (derived-mode-p 'org-mode)
     (org-map-dblocks 'org-update-dblock)))
 
 
@@ -13551,7 +13551,7 @@ This works in the agenda, and also in an org-mode buffer."
   (interactive
    (list (region-beginning) (region-end)
 	 (let ((org-last-tags-completion-table
-		(if (eq major-mode 'org-mode)
+		(if (derived-mode-p 'org-mode)
 		    (org-get-buffer-tags)
 		  (org-global-tags-completion-table))))
 	   (org-icompleting-read
@@ -13570,7 +13570,7 @@ This works in the agenda, and also in an org-mode buffer."
     (loop for l from l1 to l2 do
 	  (org-goto-line l)
 	  (setq m (get-text-property (point) 'org-hd-marker))
-	  (when (or (and (eq major-mode 'org-mode) (org-at-heading-p))
+	  (when (or (and (derived-mode-p 'org-mode) (org-at-heading-p))
 		    (and agendap m))
 	    (setq buf (if agendap (marker-buffer m) (current-buffer))
 		  pos (if agendap m (point)))
@@ -14159,7 +14159,7 @@ things up because then unnecessary parsing is avoided."
 	  beg end range props sum-props key key1 value string clocksum)
       (save-excursion
 	(when (condition-case nil
-		  (and (eq major-mode 'org-mode) (org-back-to-heading t))
+		  (and (derived-mode-p 'org-mode) (org-back-to-heading t))
 		(error nil))
 	  (setq beg (point))
 	  (setq sum-props (get-text-property (point) 'org-summaries))
@@ -16381,7 +16381,7 @@ Entries containing a colon are interpreted as H:MM by
   "Save all Org-mode buffers without user confirmation."
   (interactive)
   (message "Saving all Org-mode buffers...")
-  (save-some-buffers t (lambda () (eq major-mode 'org-mode)))
+  (save-some-buffers t (lambda () (derived-mode-p 'org-mode)))
   (when (featurep 'org-id) (org-id-locations-save))
   (message "Saving all Org-mode buffers... done"))
 
@@ -16405,7 +16405,7 @@ changes from another.  I believe the procedure must be like this:
     (save-window-excursion
       (mapc
        (lambda (b)
-	 (when (and (with-current-buffer b (eq major-mode 'org-mode))
+	 (when (and (with-current-buffer b (derived-mode-p 'org-mode))
 		    (with-current-buffer b buffer-file-name))
 	   (org-pop-to-buffer-same-window b)
 	   (revert-buffer t 'no-confirm)))
@@ -16457,17 +16457,17 @@ If EXCLUDE-TMP is non-nil, ignore temporary buffers."
 	 (filter
 	  (cond
 	   ((eq predicate 'files)
-	    (lambda (b) (with-current-buffer b (eq major-mode 'org-mode))))
+	    (lambda (b) (with-current-buffer b (derived-mode-p 'org-mode))))
 	   ((eq predicate 'export)
 	    (lambda (b) (string-match "\*Org .*Export" (buffer-name b))))
 	   ((eq predicate 'agenda)
 	    (lambda (b)
 	      (with-current-buffer b
-		(and (eq major-mode 'org-mode)
+		(and (derived-mode-p 'org-mode)
 		     (setq bfn (buffer-file-name b))
 		     (member (file-truename bfn) agenda-files)))))
 	   (t (lambda (b) (with-current-buffer b
-			    (or (eq major-mode 'org-mode)
+			    (or (derived-mode-p 'org-mode)
 				(string-match "\*Org .*Export"
 					      (buffer-name b)))))))))
     (delq nil
@@ -16770,7 +16770,7 @@ an embedded LaTeX fragment, let texmathp do its job.
       (interactive)
       (let (p)
 	(cond
-	 ((not (eq major-mode 'org-mode)) ad-do-it)
+	 ((not (derived-mode-p 'org-mode)) ad-do-it)
 	 ((eq this-command 'cdlatex-math-symbol)
 	  (setq ad-return-value t
 		texmathp-why '("cdlatex-math-symbol in org-mode" . 0)))
@@ -19476,8 +19476,8 @@ Your bug report will be posted to the Org-mode mailing list.
     (save-excursion
       (while bl
 	(set-buffer (pop bl))
-	(if (eq major-mode 'org-mode) (setq bl nil)))
-      (when (eq major-mode 'org-mode)
+	(if (derived-mode-p 'org-mode) (setq bl nil)))
+      (when (derived-mode-p 'org-mode)
 	(easy-menu-change
 	 '("Org") "File List for Agenda"
 	 (append
@@ -20106,18 +20106,18 @@ block from point."
     ;; Emacs 23
     (add-hook 'occur-mode-find-occurrence-hook
 	      (lambda ()
-		(when (eq major-mode 'org-mode)
+		(when (derived-mode-p 'org-mode)
 		  (org-reveal))))
   ;; Emacs 22
   (defadvice occur-mode-goto-occurrence
     (after org-occur-reveal activate)
-    (and (eq major-mode 'org-mode) (org-reveal)))
+    (and (derived-mode-p 'org-mode) (org-reveal)))
   (defadvice occur-mode-goto-occurrence-other-window
     (after org-occur-reveal activate)
-    (and (eq major-mode 'org-mode) (org-reveal)))
+    (and (derived-mode-p 'org-mode) (org-reveal)))
   (defadvice occur-mode-display-occurrence
     (after org-occur-reveal activate)
-    (when (eq major-mode 'org-mode)
+    (when (derived-mode-p 'org-mode)
       (let ((pos (occur-mode-find-occurrence)))
 	(with-current-buffer (marker-buffer pos)
 	  (save-excursion
@@ -21282,7 +21282,7 @@ If there is no such heading, return nil."
   (org-back-to-heading invisible-OK)
   (let ((first t)
 	(level (funcall outline-level)))
-    (if (and (eq major-mode 'org-mode) (< level 1000))
+    (if (and (derived-mode-p 'org-mode) (< level 1000))
 	;; A true heading (not a plain list item), in Org-mode
 	;; This means we can easily find the end by looking
 	;; only for the right number of stars.  Using a regexp to do
@@ -21307,7 +21307,7 @@ If there is no such heading, return nil."
 
 (defadvice outline-end-of-subtree (around prefer-org-version activate compile)
   "Use Org version in org-mode, for dramatic speed-up."
-  (if (eq major-mode 'org-mode)
+  (if (derived-mode-p 'org-mode)
       (progn
 	(org-end-of-subtree nil t)
 	(unless (eobp) (backward-char 1)))
@@ -21480,7 +21480,7 @@ Show the heading too, if it is currently invisible."
   '(progn
      (add-hook 'imenu-after-jump-hook
 	       (lambda ()
-		 (if (eq major-mode 'org-mode)
+		 (if (derived-mode-p 'org-mode)
 		     (org-show-context 'org-goto))))))
 
 (defun org-link-display-format (link)
@@ -21541,7 +21541,7 @@ To get rid of the restriction, use \\[org-agenda-remove-restriction-lock]."
       (with-current-buffer (find-file-noselect
 			    (let ((default-directory dir))
 			      (expand-file-name txt)))
-	(unless (eq major-mode 'org-mode)
+	(unless (derived-mode-p 'org-mode)
 	  (error "Cannot restrict to non-Org-mode file"))
 	(org-agenda-set-restriction-lock 'file)))
      (t (error "Don't know how to restrict Org-mode's agenda")))
@@ -21558,7 +21558,7 @@ To get rid of the restriction, use \\[org-agenda-remove-restriction-lock]."
      (define-key speedbar-file-key-map ">" 'org-agenda-remove-restriction-lock)
      (define-key speedbar-file-key-map "\C-c\C-x>" 'org-agenda-remove-restriction-lock)
      (add-hook 'speedbar-visiting-tag-hook
-	       (lambda () (and (eq major-mode 'org-mode) (org-show-context 'org-goto))))))
+	       (lambda () (and (derived-mode-p 'org-mode) (org-show-context 'org-goto))))))
 
 ;;; Fixes and Hacks for problems with other packages
 
@@ -21601,12 +21601,12 @@ To get rid of the restriction, use \\[org-agenda-remove-restriction-lock]."
 (eval-after-load "ecb"
   '(defadvice ecb-method-clicked (after esf/org-show-context activate)
      "Make hierarchy visible when jumping into location from ECB tree buffer."
-     (if (eq major-mode 'org-mode)
+     (if (derived-mode-p 'org-mode)
 	 (org-show-context))))
 
 (defun org-bookmark-jump-unhide ()
   "Unhide the current position, to show the bookmark location."
-  (and (eq major-mode 'org-mode)
+  (and (derived-mode-p 'org-mode)
        (or (outline-invisible-p)
 	   (save-excursion (goto-char (max (point-min) (1- (point))))
 			   (outline-invisible-p)))