[PATCH v2] printk: Add a short description string to kmsg_dump()

[Jocelyn Falempe]

On 02/07/2024 14:26, Jocelyn Falempe wrote:
> kmsg_dump doesn't forward the panic reason string to the kmsg_dumper
> callback.
> This patch adds a new struct kmsg_dump_detail, that will hold the
> reason and description, and pass it to the dump() callback.
> 
> To avoid updating all kmsg_dump() call, it adds a kmsg_dump_desc()
> function and a macro for backward compatibility.
> 
> I've written this for drm_panic, but it can be useful for other
> kmsg_dumper.
> It allows to see the panic reason, like "sysrq triggered crash"
> or "VFS: Unable to mount root fs on xxxx" on the drm panic screen.
> 
> v2:
>   * Use a struct kmsg_dump_detail to hold the reason and description
>     pointer, for more flexibility if we want to add other parameters.
>     (Kees Cook)
>   * Fix powerpc/nvram_64 build, as I didn't update the forward
>     declaration of oops_to_nvram()
> 
> Signed-off-by: Jocelyn Falempe <jfalempe at redhat.com>
> ---
>   arch/powerpc/kernel/nvram_64.c             |  8 ++++----
>   arch/powerpc/platforms/powernv/opal-kmsg.c |  4 ++--
>   arch/um/kernel/kmsg_dump.c                 |  2 +-
>   drivers/gpu/drm/drm_panic.c                |  4 ++--
>   drivers/hv/hv_common.c                     |  4 ++--
>   drivers/mtd/mtdoops.c                      |  2 +-
>   fs/pstore/platform.c                       | 10 +++++-----
>   include/linux/kmsg_dump.h                  | 22 +++++++++++++++++++---
>   kernel/panic.c                             |  2 +-
>   kernel/printk/printk.c                     | 11 ++++++++---
>   10 files changed, 45 insertions(+), 24 deletions(-)
> 

[...]

I pushed it to drm-misc-next, with the whitespace change in kmsg_dump.h

Thanks all for your reviews and comments.

Best regards,

-- 

Jocelyn