On Sat, Nov 06, 2021 at 06:28:54PM +0800, Borislav Petkov wrote:

On Fri, Oct 29, 2021 at 09:02:21PM +0800, Huang Rui wrote:

quoted

Add Collaborative Processor Performance Control feature flag for AMD
processors.

This feature flag will be used on the following amd-pstate driver. The
amd-pstate driver has two approaches to implement the frequency control
behavior. That depends on the CPU hardware implementation. One is "Full
MSR Support" and another is "Shared Memory Support". The feature flag
indicates the current processors with "Full MSR Support".

Signed-off-by: Huang Rui <ray.huang@amd.com>
---
 arch/x86/include/asm/cpufeatures.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h
index d0ce5cfd3ac1..f23dc1abd485 100644
--- a/arch/x86/include/asm/cpufeatures.h
+++ b/arch/x86/include/asm/cpufeatures.h

@@ -313,6 +313,7 @@
 #define X86_FEATURE_AMD_SSBD		(13*32+24) /* "" Speculative Store Bypass Disable */
 #define X86_FEATURE_VIRT_SSBD		(13*32+25) /* Virtualized Speculative Store Bypass Disable */
 #define X86_FEATURE_AMD_SSB_NO		(13*32+26) /* "" Speculative Store Bypass is fixed in hardware. */
+#define X86_FEATURE_AMD_CPPC		(13*32+27) /* Collaborative Processor Performance Control */

I know I have acked this already but an Intel patchset made me look at
this again: there's no need to have the vendor name in the feature name:

X86_FEATURE_CPPC

is perfectly fine.

Fine. Will update it in V4.

Thanks,
Ray