Re: [PATCH] init/Kconfig: update KALLSYMS_ALL help text
From: Masahiro Yamada
Date: Mon Jul 11 2022 - 01:01:34 EST
On Thu, Jul 7, 2022 at 1:45 PM Baruch Siach <baruch@xxxxxxxxxx> wrote:
>
> CONFIG_KALLSYMS_ALL is required for kernel live patching which is a
> common use case that is enabled in some major distros. Update the
> Kconfig help text to reflect that.
>
> While at it, s/e.g./i.e./ to match the text intention.
>
> Signed-off-by: Baruch Siach <baruch@xxxxxxxxxx>
> ---
Applied to linux-kbuild.
Thanks.
> init/Kconfig | 9 +++++----
> 1 file changed, 5 insertions(+), 4 deletions(-)
>
> diff --git a/init/Kconfig b/init/Kconfig
> index c7900e8975f1..20ef72dd6f44 100644
> --- a/init/Kconfig
> +++ b/init/Kconfig
> @@ -1722,16 +1722,17 @@ config KALLSYMS_ALL
> help
> Normally kallsyms only contains the symbols of functions for nicer
> OOPS messages and backtraces (i.e., symbols from the text and inittext
> - sections). This is sufficient for most cases. And only in very rare
> - cases (e.g., when a debugger is used) all symbols are required (e.g.,
> - names of variables from the data sections, etc).
> + sections). This is sufficient for most cases. And only if you want to
> + enable kernel live patching, or other less common use cases (e.g.,
> + when a debugger is used) all symbols are required (i.e., names of
> + variables from the data sections, etc).
>
> This option makes sure that all symbols are loaded into the kernel
> image (i.e., symbols from all sections) in cost of increased kernel
> size (depending on the kernel configuration, it may be 300KiB or
> something like this).
>
> - Say N unless you really need all symbols.
> + Say N unless you really need all symbols, or kernel live patching.
>
> config KALLSYMS_ABSOLUTE_PERCPU
> bool
> --
> 2.35.1
>
--
Best Regards
Masahiro Yamada