linux-kernel - Re: [PATCH 3.16 00/19] 3.16.43-rc1 review

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Date:   Sat, 1 Apr 2017 10:43:59 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Ben Hutchings <ben@...adent.org.uk>, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Cc:     torvalds@...ux-foundation.org, akpm@...ux-foundation.org
Subject: Re: [PATCH 3.16 00/19] 3.16.43-rc1 review

On 04/01/2017 06:17 AM, Ben Hutchings wrote:
> This is the start of the stable review cycle for the 3.16.43 release.
> There are 19 patches in this series, which will be posted as responses
> to this one.  If anyone has any issues with these being applied, please
> let me know.
>
> Responses should be made by Tue Apr 04 00:00:00 UTC 2017.
> Anything received after that time might be too late.
>

Build results:
	total: 140 pass: 126 fail: 14
Failed builds:
     binutils 2.22:
	mips:defconfig
	mips:allnoconfig
     binutils 2.24:
	mips:defconfig
	mips:allmodconfig
	mips:allnoconfig
	mips:bcm47xx_defconfig
	mips:bcm63xx_defconfig
	mips:nlm_xlp_defconfig
	mips:ath79_defconfig
	mips:ar7_defconfig
	mips:e55_defconfig
	mips:cavium_octeon_defconfig
	mips:malta_defconfig
	mips:rt305x_defconfig

Qemu test results:
	total: 107 pass: 98 fail: 9
Failed tests:
	mips:malta_defconfig:nosmp
	mips:malta_defconfig:smp
	mips64:malta_defconfig:nosmp
	mips64:malta_defconfig:smp
	mipsel:24Kf:malta_defconfig:nosmp
	mipsel:24Kf:malta_defconfig:smp
	mipsel64:malta_defconfig:nosmp
	mipsel64:malta_defconfig:smp
	mipsel64:fuloong2e_defconfig:fulong2e

I tried to build mips:allnoconfig with the following binutils versions.
They all fail with the same errors.
	2.22 (from Poky version 1.3)
	2.22 (kernel toolchain, gcc 4.6.3)
	2.24 (kernel toolchain, gcc 4.9.0)
	2.26.1 (buildroot toolchain, gcc 5.4.0)

Bisect points to commit c4cf8e3a3e8f as the culprit.

Details are available at http://kerneltests.org/builders.
Unfortunately, just reverting this one patch doesn't work.
Reverting

f1ece3b9dd5e MIPS: Fix build with binutils 2.24.51+
f8547d2f97c8 MIPS: init upper 64b of vector registers when MSA is first used
c4cf8e3a3e8f MIPS: save/restore MSACSR register on context switch

fixes the problem, at least for an allnoconfig build with binutils 2.24.

Guenter