On Wed, Mar 15, 2023 at 03:40:15AM -0700, Rhythm Mahajan wrote:
> The commit: 3f235279828c ("x86/cpu: Restore AMD's DE_CFG MSR after resume")
> which was backported from the upstream commit: 2632daebafd0 renamed the
> MSR_F10H_DECFG_LFENCE_SERIALIZE macro to MSR_AMD64_DE_CFG_LFENCE_SERIALIZE.
> The fix for 4.14 and 4.9 changed MSR_F10H_DECFG_LFENCE_SERIALIZE to
> MSR_AMD64_DE_CFG_LFENCE_SERIALIZE_BIT in the init_amd() function, but
> should have used MSR_AMD64_DE_CFG_LFENCE_SERIALIZE.
> This causes a discrepency in the LFENCE serialization check in the
> init_amd() function.
>
> This causes a ~16% sysbench memory regression, when running:
> sysbench --test=memory run
>
> Fixes: 3f235279828c ("x86/cpu: Restore AMD's DE_CFG MSR after resume")
> Signed-off-by: Rhythm Mahajan <rhythm.m.mahajan@xxxxxxxxxx>
> ---
> v1->v2
> Corrected the formatting of the commit message.
Now queued up, thanks.
greg k-h
