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Re: [PATCH 4/6] aarch64: Allow overriding HWCAP_CPUID feature check using HWCAP_MASK

From: Adhemerval Zanella <adhemerval dot zanella at linaro dot org>
To: Siddhesh Poyarekar <siddhesh at sourceware dot org>, libc-alpha at sourceware dot org
Cc: sellcey at cavium dot com
Date: Tue, 6 Jun 2017 15:24:14 -0300
Subject: Re: [PATCH 4/6] aarch64: Allow overriding HWCAP_CPUID feature check using HWCAP_MASK
Authentication-results: sourceware.org; auth=none
References: <1496347928-19432-1-git-send-email-siddhesh@sourceware.org> <1496347928-19432-5-git-send-email-siddhesh@sourceware.org>


On 01/06/2017 17:12, Siddhesh Poyarekar wrote:
> Now that LD_HWCAP_MASK (or glibc.tune.hwcap_mask) is read early enough
> to influence cpu feature check in aarch64, use it to influence
> multiarch selection.  Setting LD_HWCAP_MASK such that it clears
> HWCAP_CPUID will now disable multiarch for the binary.
> 
> HWCAP_CPUID is also now set in HWCAP_IMPORTANT so that it is set by
> default.  With this patch, this feature is only usable with
> dyanmically linked binaries because LD_HWCAP_MASK is not read for
> static binaries.  A future patch fixes that.
> 
> 	* sysdeps/unix/sysv/linux/aarch64/cpu-features.c
> 	(init_cpu_features): Use glibc.tune.hwcap_mask.
> 	* sysdeps/unix/sysv/linux/aarch64/dl-procinfo.h: New file.

LGTM.

References:
- [PATCH v3 0/6] aarch64: Allow overriding HWCAP_CPUID feature check
  - From: Siddhesh Poyarekar
- [PATCH 4/6] aarch64: Allow overriding HWCAP_CPUID feature check using HWCAP_MASK
  - From: Siddhesh Poyarekar

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