From: James Bottomley The following: "[PATCH] sched: new sched domain for representing multi-core" Incorrectly makes SCHED_SMT and some of the structures it uses dependent on SMP. However, this is wrong, the structures are only defined if X86_HT, so SCHED_SMT has to depend on that as well. The patch broke voyager, since it doesn't provide any of the multi-core or hyperthreading structures. Signed-off-by: James Bottomley Signed-off-by: Andrew Morton --- arch/i386/Kconfig | 4 ++-- arch/i386/kernel/cpu/common.c | 2 +- arch/i386/kernel/cpu/intel_cacheinfo.c | 6 +++--- 3 files changed, 6 insertions(+), 6 deletions(-) diff -puN arch/i386/Kconfig~fix-subarchitecture-breakage-with-config_sched_smt arch/i386/Kconfig --- a/arch/i386/Kconfig~fix-subarchitecture-breakage-with-config_sched_smt +++ a/arch/i386/Kconfig @@ -233,7 +233,7 @@ config NR_CPUS config SCHED_SMT bool "SMT (Hyperthreading) scheduler support" - depends on SMP + depends on X86_HT help SMT scheduler support improves the CPU scheduler's decision making when dealing with Intel Pentium 4 chips with HyperThreading at a @@ -242,7 +242,7 @@ config SCHED_SMT config SCHED_MC bool "Multi-core scheduler support" - depends on SMP + depends on X86_HT default y help Multi-core scheduler support improves the CPU scheduler's decision diff -puN arch/i386/kernel/cpu/common.c~fix-subarchitecture-breakage-with-config_sched_smt arch/i386/kernel/cpu/common.c --- a/arch/i386/kernel/cpu/common.c~fix-subarchitecture-breakage-with-config_sched_smt +++ a/arch/i386/kernel/cpu/common.c @@ -294,7 +294,7 @@ void __cpuinit generic_identify(struct c if (c->x86 >= 0x6) c->x86_model += ((tfms >> 16) & 0xF) << 4; c->x86_mask = tfms & 15; -#ifdef CONFIG_SMP +#ifdef CONFIG_X86_HT c->apicid = phys_pkg_id((ebx >> 24) & 0xFF, 0); #else c->apicid = (ebx >> 24) & 0xFF; diff -puN arch/i386/kernel/cpu/intel_cacheinfo.c~fix-subarchitecture-breakage-with-config_sched_smt arch/i386/kernel/cpu/intel_cacheinfo.c --- a/arch/i386/kernel/cpu/intel_cacheinfo.c~fix-subarchitecture-breakage-with-config_sched_smt +++ a/arch/i386/kernel/cpu/intel_cacheinfo.c @@ -261,7 +261,7 @@ unsigned int __cpuinit init_intel_cachei 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_SMP +#ifdef CONFIG_X86_HT unsigned int cpu = (c == &boot_cpu_data) ? 0 : (c - cpu_data); #endif @@ -383,14 +383,14 @@ unsigned int __cpuinit init_intel_cachei if (new_l2) { l2 = new_l2; -#ifdef CONFIG_SMP +#ifdef CONFIG_X86_HT cpu_llc_id[cpu] = l2_id; #endif } if (new_l3) { l3 = new_l3; -#ifdef CONFIG_SMP +#ifdef CONFIG_X86_HT cpu_llc_id[cpu] = l3_id; #endif } _