linux-kernel - Re: [PATCH 5.15 000/168] 5.15.176-rc1 review

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Message-ID: <fc58a412-b154-4286-9097-4f3c5d7d97aa@w6rz.net>
Date: Mon, 6 Jan 2025 22:32:32 -0800
From: Ron Economos <re@...z.net>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org
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,
 f.fainelli@...il.com, sudipm.mukherjee@...il.com, srw@...dewatkins.net,
 rwarsow@....de, conor@...nel.org, hargar@...rosoft.com, broonie@...nel.org
Subject: Re: [PATCH 5.15 000/168] 5.15.176-rc1 review

On 1/6/25 07:15, Greg Kroah-Hartman wrote:
> This is the start of the stable review cycle for the 5.15.176 release.
> There are 168 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 Wed, 08 Jan 2025 15:11:04 +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/v5.x/stable-review/patch-5.15.176-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-5.15.y
> and the diffstat can be found below.
>
> thanks,
>
> greg k-h

On RISC-V, the build fails with:

In file included from mm/kfence/core.c:33:
./arch/riscv/include/asm/kfence.h: In function 'kfence_protect_page':
./arch/riscv/include/asm/kfence.h:59:9: error: implicit declaration of 
function 'local_flush_tlb_kernel_range'; did you mean 
'flush_tlb_kernel_range'? [-Werror=implicit-function-declaration]
    59 |         local_flush_tlb_kernel_range(addr, addr + PAGE_SIZE);
       |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
       |         flush_tlb_kernel_range
In file included from mm/kfence/report.c:20:
./arch/riscv/include/asm/kfence.h: In function 'kfence_protect_page':
./arch/riscv/include/asm/kfence.h:59:9: error: implicit declaration of 
function 'local_flush_tlb_kernel_range'; did you mean 
'flush_tlb_kernel_range'? [-Werror=implicit-function-declaration]
    59 |         local_flush_tlb_kernel_range(addr, addr + PAGE_SIZE);
       |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
       |         flush_tlb_kernel_range

This is caused by commit d28e50e231ce20a9b9cad9edce139ac775421ce5 riscv: 
Fix IPIs usage in kfence_protect_page().

The function local_flush_tlb_kernel_range() doesn't exist for RISC-V in 
5.15.x and doesn't appear until much later in 6.8-rc1. So probably best 
to drop this patch.