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Subject: Re: [PATCH v2] getauxval.3: MIPS, AT_BASE_PLATFORM passes ISA level
To:     YunQiang Su <syq@debian.org>
References: <20200322095527.397716-1-syq@debian.org>
From:   "Michael Kerrisk (man-pages)" <mtk.manpages@gmail.com>
Message-ID: <827f0ae8-2e97-5eeb-387d-275d8aac98ad@gmail.com>
Date:   Thu, 26 Mar 2020 09:12:23 +0100
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Hello YunQiang Su

On 3/22/20 10:55 AM, YunQiang Su wrote:
> Since Linux 5.7, on MIPS, we use AT_BASE_PLATFORM to pass ISA level.
> The values may be:
>   mips2, mips3, mips4, mips5,
>   mips32, mips32r2, mips32r6,
>   mips64, mips64r2, mips64r6.
> 
> This behavior is different with PowerPC.

Thank you for the patch. I see that this is scheduled for 
Linux 5.7 (for which the merge window is not yet open).
How certain is it that the feature will land in 5.7?

Thanks,

Michael

> https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=e585b768da111f2c2d413de6214e83bbdfee8f22
> Signed-off-by: YunQiang Su <syq@debian.org>
> 
> ----
> v1 -> v2: fix typo
> ---
>  man3/getauxval.3 | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/man3/getauxval.3 b/man3/getauxval.3
> index 456371c6a..bcc116dd2 100644
> --- a/man3/getauxval.3
> +++ b/man3/getauxval.3
> @@ -60,9 +60,10 @@ values are present on all architectures.
>  The base address of the program interpreter (usually, the dynamic linker).
>  .TP
>  .BR AT_BASE_PLATFORM
> -A pointer to a string identifying the real platform; may differ from
> -.BR AT_PLATFORM
> -(PowerPC only).
> +A pointer to a string (PowerPC and MIPS only).
> +On PowerPC, this identifies the real platform; may differ from
> +.BR AT_PLATFORM "."
> +On MIPS, this identifies the ISA level (Since 5.7).
>  .TP
>  .BR AT_CLKTCK
>  The frequency with which
> 


-- 
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Linux/UNIX System Programming Training: http://man7.org/training/