From 6c4f5abaf3566dbf5b26e7b14f4392be400f12e3 Mon Sep 17 00:00:00 2001 From: Suravee Suthikulpanit Date: Fri, 27 Apr 2018 16:48:00 -0500 Subject: [PATCH] x86/CPU: Modify detect_extended_topology() to return result Current implementation does not communicate whether it can successfully detect CPUID function 0xB information. Therefore, modify the function to return success or error codes. This will be used by subsequent patches. Signed-off-by: Suravee Suthikulpanit Signed-off-by: Borislav Petkov Signed-off-by: Thomas Gleixner Reviewed-by: Borislav Petkov Link: http://lkml.kernel.org/r/1524865681-112110-2-git-send-email-suravee.suthikulpanit@amd.com --- arch/x86/include/asm/processor.h | 2 +- arch/x86/kernel/cpu/topology.c | 8 ++++---- 2 files changed, 5 insertions(+), 5 deletions(-) diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h index 4fa4206029e3..7aa2caa82b2d 100644 --- a/arch/x86/include/asm/processor.h +++ b/arch/x86/include/asm/processor.h @@ -193,7 +193,7 @@ extern u32 get_scattered_cpuid_leaf(unsigned int level, extern unsigned int init_intel_cacheinfo(struct cpuinfo_x86 *c); extern void init_amd_cacheinfo(struct cpuinfo_x86 *c); -extern void detect_extended_topology(struct cpuinfo_x86 *c); +extern int detect_extended_topology(struct cpuinfo_x86 *c); extern void detect_ht(struct cpuinfo_x86 *c); #ifdef CONFIG_X86_32 diff --git a/arch/x86/kernel/cpu/topology.c b/arch/x86/kernel/cpu/topology.c index b099024d339c..81c0afb39d0a 100644 --- a/arch/x86/kernel/cpu/topology.c +++ b/arch/x86/kernel/cpu/topology.c @@ -27,7 +27,7 @@ * exists, use it for populating initial_apicid and cpu topology * detection. */ -void detect_extended_topology(struct cpuinfo_x86 *c) +int detect_extended_topology(struct cpuinfo_x86 *c) { #ifdef CONFIG_SMP unsigned int eax, ebx, ecx, edx, sub_index; @@ -36,7 +36,7 @@ void detect_extended_topology(struct cpuinfo_x86 *c) static bool printed; if (c->cpuid_level < 0xb) - return; + return -1; cpuid_count(0xb, SMT_LEVEL, &eax, &ebx, &ecx, &edx); @@ -44,7 +44,7 @@ void detect_extended_topology(struct cpuinfo_x86 *c) * check if the cpuid leaf 0xb is actually implemented. */ if (ebx == 0 || (LEAFB_SUBTYPE(ecx) != SMT_TYPE)) - return; + return -1; set_cpu_cap(c, X86_FEATURE_XTOPOLOGY); @@ -95,6 +95,6 @@ void detect_extended_topology(struct cpuinfo_x86 *c) c->cpu_core_id); printed = 1; } - return; #endif + return 0; } -- 2.11.0