On 6/20/2025 10:31 AM, Kirill A. Shutemov wrote:
On Fri, Jun 20, 2025 at 08:36:30AM -0700, Xin Li wrote:
On 6/20/2025 6:53 AM, Kirill A. Shutemov wrote:
diff --git a/arch/x86/Kconfig.cpufeatures b/arch/x86/Kconfig.cpufeatures
index 250c10627ab3..9574c198fc08 100644
--- a/arch/x86/Kconfig.cpufeatures
+++ b/arch/x86/Kconfig.cpufeatures
@@ -124,6 +124,10 @@ config X86_DISABLED_FEATURE_PCID
def_bool y
depends on !X86_64
+config X86_DISABLED_FEATURE_LASS
+ def_bool y
+ depends on !X86_64
+
config X86_DISABLED_FEATURE_PKU
def_bool y
depends on !X86_INTEL_MEMORY_PROTECTION_KEYS
You don't need to add X86_DISABLED_FEATURE_LASS, because the LASS code
is NOT optional at build time, i.e., you now don't have CONFIG_X86_LASS.
Hmm. But it is optional. It depends on CONFIG_X86_64. I don't think we
want it to be advertised on 32-bit kernels.
I kind of ignore 32-bit...
But I simply hate adding a disabled feature that depends on !X86_64;
x86_64 has a broad scope, and new CPU features are often intentionally
not enabled for 32-bit.
(X86_DISABLED_FEATURE_PCID is the only one before LASS)
