Re: [PATCH v2] random: vDSO: Avoid call to memset() when zeroing reserved in __cvdso_getrandom_data()

["Christophe Leroy (CS GROUP)" <chleroy@kernel.org>]

Le 02/10/2026 à 12:58, Jason A. Donenfeld a écrit :
> On Fri, Oct 2, 2026 at 12:57 PM Christophe Leroy (CS GROUP)
> <chleroy@kernel.org> wrote:
>>
>>
>> On Fri, 25 Sep 2026 22:46:32 +0100, Nathan Chancellor wrote:
>>> After a recent change in LLVM [1], builds with the random vDSO
>>> implementation, such as PowerPC and RISC-V, fail when checking the vDSO:
>>>
>>>    arch/powerpc/kernel/vdso/vdso32.so.dbg: dynamic relocations are not supported
>>>    arch/riscv/kernel/vdso/vdso.so.dbg: dynamic relocations are not supported
>>>
>>> memset() is now generated when zeroing params->reserved for some builds
>>> because LLVM has an optimization (now run in more instances) that can
>>> recognize at compile time when it is assigning a static value to a
>>> contiguous area of memory and turn that into a call to memset(). Both
>>> clang and GCC assume memset() is always available [2].
>>>
>>> [...]
>>
>> Applied, thanks!
>>
>> [1/1] random: vDSO: Avoid call to memset() when zeroing reserved in __cvdso_getrandom_data()
>>        (no commit info)
> 
> That's not for you to apply. I'm sending this through my random tree,
> along with a handful of other things I need to fix. But I wanted to
> let this cook a bit more. I can add your reviewed-by line, though.

Sorry I messed up with 'b4 ty', I do not intent to take this patch in my 
tree.