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Re: [PATCH] Add ifunc memcpy and memmove for aarch64

From: Joseph Myers <joseph at codesourcery dot com>
To: Adhemerval Zanella <adhemerval dot zanella at linaro dot org>
Cc: <libc-alpha at sourceware dot org>
Date: Thu, 19 Jan 2017 21:04:32 +0000
Subject: Re: [PATCH] Add ifunc memcpy and memmove for aarch64
Authentication-results: sourceware.org; auth=none
References: <1484850162.4759.24.camel@caviumnetworks.com> <4b2ac221-f201-e740-13c4-9abf69149941@linaro.org>

On Thu, 19 Jan 2017, Adhemerval Zanella wrote:

> We need to make sure glibc built against older kernel headers (or with
> --enable-kernel=x.y.z) do not use mrs instruction and glibc built against
> newer kernel that may use mrs fail on loading with DL_SYSDEP_OSCHECK.

Agreed.  That is, I think that either the configured minimum kernel 
version or the kernel support at runtime (or both, with the configured 
minimum kernel allowing runtime tests to be disabled) should be what 
determines whether these implementations can be used - rather than 
enabling multi-arch changing the minimum kernel version.

-- 
Joseph S. Myers
joseph@codesourcery.com

References:
- [PATCH] Add ifunc memcpy and memmove for aarch64
  - From: Steve Ellcey
- Re: [PATCH] Add ifunc memcpy and memmove for aarch64
  - From: Adhemerval Zanella

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