_ddebug table is empty in a CONFIG_DYNAMIC_DEBUG build

_ddebug table is empty in a CONFIG_DYNAMIC_DEBUG build

If you are pulling your hair and wondering why your kernel does not have a /sys/kernel/debug/dynamic_debug directory despite having CONFIG_DYNAMIC_DEBUG enabled and debugfs mounted, the issue could be that you built the kernel using GOLD linker. You can simply switch through the LD Makefile variable (make LD=ld.bfd)

Extracting and applying a clean git patchset from an email thread with notmuch

I just wrote a quick python script to filter the actual patches from a email thread send with git send-email (those "[PATCH 1/15] xyz" threads). The script assumes you use notmuch. Give it a search expression that returns a list of messages that includes all the patches like the thread-id (C-u c i while looking at the thread in emacs).

You can get it on github. There is a small elisp snippet in the README to run the script and apply the patchset from emacs.

Copy current buffer absolute file path to the OS clipboard

(defun copy-full-path ()
  (interactive)
  (let ((path (buffer-file-name)))
    (when path
      (setq path (expand-file-name path))
      (funcall interprogram-cut-function path)
      (message "copied %s in clipboard" path))))

Quick-and-dirty email template for notmuch

(defun prepare-report ()
  (interactive)
  (notmuch-mua-new-mail)
  (insert "foo@example.com")
  (search-forward "Subject: ")
  (insert "work report week " (format-time-string "%W"))
  (search-forward "\n\n")
  (backward-char)
  (insert "my super email content\n"))

Jump to code from Coverity report emails (notmuch)

If you use notmuch as your email client and receive Coverity reports emails, here's a quick function that compiles the reports to a single buffer (newest first), applies some color on the errors, and enables the compilation minor mode so you can use Emacs regular "jump to next error" key.

Adapt the default-directory to your project source.

(defun samba-coverity ()
  (interactive)
  (let ((b (get-buffer-create "*coverity*")))
    (with-current-buffer b
      (erase-buffer)
      (setq default-directory (expand-file-name "~/prog/samba-git"))
      (insert
       (shell-command-to-string
 (concat
  "for i in $(notmuch search --output=messages"
  " 'from:scan-admin@coverity.com'); do notmuch show $i; done"
  " | perl -pE 's,^/(\\S+): (\\d+) in,cov:$1:$2: in,'")))
      (goto-char (point-min))
      (while (search-forward-regexp (rx bol ">>>") nil t)
 (let ((beg (save-excursion (beginning-of-line) (point)))
       (end (save-excursion (end-of-line) (point))))
   (put-text-property beg end 'face 'error)))
      (goto-char (point-min))      
      (compilation-minor-mode))
    (switch-to-buffer b)))