linux-kernel - Re: [PATCH 6.1 000/100] 6.1.74-rc1 review

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Date: Thu, 18 Jan 2024 11:10:31 -0800
From: Florian Fainelli <f.fainelli@...il.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org,
 Stefan Wiehler <stefan.wiehler@...ia.com>
Cc: patches@...ts.linux.dev, linux-kernel@...r.kernel.org,
 torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
 linux@...ck-us.net, shuah@...nel.org, patches@...nelci.org,
 lkft-triage@...ts.linaro.org, pavel@...x.de, jonathanh@...dia.com,
 sudipm.mukherjee@...il.com, srw@...dewatkins.net, rwarsow@....de,
 conor@...nel.org, allen.lkml@...il.com
Subject: Re: [PATCH 6.1 000/100] 6.1.74-rc1 review

+Stefan,

On 1/18/24 02:48, Greg Kroah-Hartman wrote:
> This is the start of the stable review cycle for the 6.1.74 release.
> There are 100 patches in this series, all will be posted as a response
> to this one.  If anyone has any issues with these being applied, please
> let me know.
> 
> Responses should be made by Sat, 20 Jan 2024 10:42:49 +0000.
> Anything received after that time might be too late.
> 
> The whole patch series can be found in one patch at:
> 	https://www.kernel.org/pub/linux/kernel/v6.x/stable-review/patch-6.1.74-rc1.gz
> or in the git tree and branch at:
> 	git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-6.1.y
> and the diffstat can be found below.
> 
> thanks,
> 
> greg k-h

ARM and ARM64 builds worked fine and passed tests, however BMIPS_GENERIC 
fails to build with:

arch/mips/kernel/smp.c: In function 'start_secondary':
arch/mips/kernel/smp.c:340:2: error: implicit declaration of function 
'rcutree_report_cpu_starting'; did you mean 'rcu_cpu_starting'? 
[-Werror=implicit-function-declaration]
   rcutree_report_cpu_starting(cpu);
   ^~~~~~~~~~~~~~~~~~~~~~~~~~~
   rcu_cpu_starting
cc1: all warnings being treated as errors
host-make[5]: *** [scripts/Makefile.build:250: arch/mips/kernel/smp.o] 
Error 1
host-make[4]: *** [scripts/Makefile.build:500: arch/mips/kernel] Error 2
host-make[3]: *** [scripts/Makefile.build:500: arch/mips] Error 2
host-make[3]: *** Waiting for unfinished jobs....

which is caused by 7c20a4cc189eff36d5aeb586008a540d8024fbff ("mips/smp: 
Call rcutree_report_cpu_starting() earlier").

It looks like rcutree_report_cpu_starting() has been introduced 
448e9f34d91d1a4799fdb06a93c2c24b34b6fd9d ("rcu: Standardize explicit 
CPU-hotplug calls") which is in v6.7.

For MIPS, it would like an adequate fix would be to 
's/rcutree_report_cpu_starting/rcu_cpu_starting/' for the 6.1 and 6.6 
branches.

Stefan, do you agree?
-- 
Florian