x86: Kill CONFIG_X86_HT

In talking to Aravind recently about making certain AMD topology
attributes available to the MCE injection module, it seemed like
that CONFIG_X86_HT thing is more or less superfluous. It is
def_bool y, depends on SMP and gets enabled in the majority of
.configs - distro and otherwise - out there.

So let's kill it and make code behind it depend directly on SMP.

Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Aravind Gopalakrishnan <Aravind.Gopalakrishnan@amd.com>
Cc: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Daniel Walter <dwalter@google.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Igor Mammedov <imammedo@redhat.com>
Cc: Jacob Shin <jacob.w.shin@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1433436928-31903-18-git-send-email-bp@alien8.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 8a5cca39e74f5a811b38372ff342aec10f3e9b80..7e39f9b227056d80a828faa1b2683d9cceb14d98 100644 (file)
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -261,10 +261,6 @@ config X86_64_SMP
        def_bool y
        depends on X86_64 && SMP
 
-config X86_HT
-       def_bool y
-       depends on SMP
-
 config X86_32_LAZY_GS
        def_bool y
        depends on X86_32 && !CC_STACKPROTECTOR
@@ -865,7 +861,7 @@ config NR_CPUS
 
 config SCHED_SMT
        bool "SMT (Hyperthreading) scheduler support"
-       depends on X86_HT
+       depends on SMP
        ---help---
          SMT scheduler support improves the CPU scheduler's decision making
          when dealing with Intel Pentium 4 chips with HyperThreading at a
@@ -875,7 +871,7 @@ config SCHED_SMT
 config SCHED_MC
        def_bool y
        prompt "Multi-core scheduler support"
-       depends on X86_HT
+       depends on SMP
        ---help---
          Multi-core scheduler support improves the CPU scheduler's decision
          making when dealing with multi-core CPU chips at a cost of slightly

diff --git a/arch/x86/include/asm/topology.h b/arch/x86/include/asm/topology.h
index 0e8f04f2c26fda3935093b7040dac783e621d71b..8d717faeed225cf53d9cf09bb57228e74845940a 100644 (file)
--- a/arch/x86/include/asm/topology.h
+++ b/arch/x86/include/asm/topology.h
@@ -26,7 +26,7 @@
 #define _ASM_X86_TOPOLOGY_H
 
 #ifdef CONFIG_X86_32
-# ifdef CONFIG_X86_HT
+# ifdef CONFIG_SMP
 #  define ENABLE_TOPO_DEFINES
 # endif
 #else

diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
index e4cf63301ff439ed390e50a81a72fef9ea50e23a..eb4f01269b5d831e0323ec629d43065e146c7fbc 100644 (file)
--- a/arch/x86/kernel/cpu/amd.c
+++ b/arch/x86/kernel/cpu/amd.c
@@ -288,7 +288,7 @@ static int nearby_node(int apicid)
  *     Assumption: Number of cores in each internal node is the same.
  * (2) AMD processors supporting compute units
  */
-#ifdef CONFIG_X86_HT
+#ifdef CONFIG_SMP
 static void amd_get_topology(struct cpuinfo_x86 *c)
 {
        u32 nodes, cores_per_cu = 1;
@@ -341,7 +341,7 @@ static void amd_get_topology(struct cpuinfo_x86 *c)
  */
 static void amd_detect_cmp(struct cpuinfo_x86 *c)
 {
-#ifdef CONFIG_X86_HT
+#ifdef CONFIG_SMP
        unsigned bits;
        int cpu = smp_processor_id();
 
@@ -420,7 +420,7 @@ static void srat_detect_node(struct cpuinfo_x86 *c)
 
 static void early_init_amd_mc(struct cpuinfo_x86 *c)
 {
-#ifdef CONFIG_X86_HT
+#ifdef CONFIG_SMP
        unsigned bits, ecx;
 
        /* Multi core CPU? */

diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index 6bec0b55863e315c65ca40ff18454aaf55844d06..b6fe2e47f7f1f5159911566c9d8b53bb8cbbb366 100644 (file)
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -508,7 +508,7 @@ static void cpu_detect_tlb(struct cpuinfo_x86 *c)
 
 void detect_ht(struct cpuinfo_x86 *c)
 {
-#ifdef CONFIG_X86_HT
+#ifdef CONFIG_SMP
        u32 eax, ebx, ecx, edx;
        int index_msb, core_bits;
        static bool printed;
@@ -844,7 +844,7 @@ static void generic_identify(struct cpuinfo_x86 *c)
        if (c->cpuid_level >= 0x00000001) {
                c->initial_apicid = (cpuid_ebx(1) >> 24) & 0xFF;
 #ifdef CONFIG_X86_32
-# ifdef CONFIG_X86_HT
+# ifdef CONFIG_SMP
                c->apicid = apic->phys_pkg_id(c->initial_apicid, 0);
 # else
                c->apicid = c->initial_apicid;

diff --git a/arch/x86/kernel/cpu/intel_cacheinfo.c b/arch/x86/kernel/cpu/intel_cacheinfo.c
index edcb0e28c336d085d0ee1011793c98ba6f5a13ae..be4febc58b9443372e4df5037e357789de5184fe 100644 (file)
--- a/arch/x86/kernel/cpu/intel_cacheinfo.c
+++ b/arch/x86/kernel/cpu/intel_cacheinfo.c
@@ -654,7 +654,7 @@ unsigned int init_intel_cacheinfo(struct cpuinfo_x86 *c)
        unsigned int new_l1d = 0, new_l1i = 0; /* Cache sizes from cpuid(4) */
        unsigned int new_l2 = 0, new_l3 = 0, i; /* Cache sizes from cpuid(4) */
        unsigned int l2_id = 0, l3_id = 0, num_threads_sharing, index_msb;
-#ifdef CONFIG_X86_HT
+#ifdef CONFIG_SMP
        unsigned int cpu = c->cpu_index;
 #endif
 
@@ -773,19 +773,19 @@ unsigned int init_intel_cacheinfo(struct cpuinfo_x86 *c)
 
        if (new_l2) {
                l2 = new_l2;
-#ifdef CONFIG_X86_HT
+#ifdef CONFIG_SMP
                per_cpu(cpu_llc_id, cpu) = l2_id;
 #endif
        }
 
        if (new_l3) {
                l3 = new_l3;
-#ifdef CONFIG_X86_HT
+#ifdef CONFIG_SMP
                per_cpu(cpu_llc_id, cpu) = l3_id;
 #endif
        }
 
-#ifdef CONFIG_X86_HT
+#ifdef CONFIG_SMP
        /*
         * If cpu_llc_id is not yet set, this means cpuid_level < 4 which in
         * turns means that the only possibility is SMT (as indicated in