The commit: 3f23527982 ("x86/cpu: Restore AMD's DE_CFG MSR after resume")
which was backported from the upstream commit: 2632daebaf 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: 3f23527982 ("x86/cpu: Restore AMD's DE_CFG MSR after resume")
Signed-off-by: Rhythm Mahajan <rhythm.m.mahajan@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
9e1f4df32e