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SubjectRe: [PATCH V3 06/49] compiler_types.h: Add __noinstr_section() for noinstr
On Wed, Oct 13, 2021 at 8:34 PM Lai Jiangshan <jiangshanlai@gmail.com> wrote:
>
> From: Lai Jiangshan <laijs@linux.alibaba.com>
>
> And it will be extended for C entry code.
>
> Cc: Borislav Petkov <bp@alien8.de>
> Reviewed-by: Kees Cook <keescook@chromium.org>
> Signed-off-by: Lai Jiangshan <laijs@linux.alibaba.com>
> ---
> include/linux/compiler_types.h | 6 ++++--
> 1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/include/linux/compiler_types.h b/include/linux/compiler_types.h
> index b6ff83a714ca..3c77631c68bd 100644
> --- a/include/linux/compiler_types.h
> +++ b/include/linux/compiler_types.h
> @@ -208,10 +208,12 @@ struct ftrace_likely_data {
> #endif
>
> /* Section for code which can't be instrumented at all */
> -#define noinstr \
> - noinline notrace __attribute((__section__(".noinstr.text"))) \
> +#define __noinstr_section(section) \
> + noinline notrace __attribute((__section__(section))) \

Can we use __section(section) here (from
include/linux/compiler_attributes.h)? I kind of can't stand seeing
attributes open coded.

> __no_kcsan __no_sanitize_address __no_profile __no_sanitize_coverage
>
> +#define noinstr __noinstr_section(".noinstr.text")
> +
> #endif /* __KERNEL__ */
>
> #endif /* __ASSEMBLY__ */
> --
> 2.19.1.6.gb485710b
>


--
Thanks,
~Nick Desaulniers

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