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

Ron Economos
2025-01-07T06:34:33Z

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.