Messages in this thread Patch in this message | | | From | Evalds Iodzevics <> | Subject | [PATCH] x86/microcode/intel: replace sync_core() with native_cpuid_reg(eax) | Date | Mon, 20 Apr 2020 15:00:37 +0300 |
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sync_core() always jums past cpuid instruction on 32 bit machines because data structure boot_cpu_data are not populated so early in boot.
It depends on commit 5dedade6dfa243c130b85d1e4daba6f027805033 for native_cpuid_reg(eax) definitions
This patch is for 4.4 but also should apply to 4.9
Signed-off-by: Evalds Iodzevics <evalds.iodzevics@gmail.com> --- arch/x86/include/asm/microcode_intel.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/include/asm/microcode_intel.h b/arch/x86/include/asm/microcode_intel.h index 90343ba50485..92ce9c8a508b 100644 --- a/arch/x86/include/asm/microcode_intel.h +++ b/arch/x86/include/asm/microcode_intel.h @@ -60,7 +60,7 @@ static inline u32 intel_get_microcode_revision(void) native_wrmsrl(MSR_IA32_UCODE_REV, 0); /* As documented in the SDM: Do a CPUID 1 here */ - sync_core(); + native_cpuid_eax(1); /* get the current revision from MSR 0x8B */ native_rdmsr(MSR_IA32_UCODE_REV, dummy, rev); -- 2.17.4
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