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| author | Thomas Gleixner <tglx@linutronix.de> | 2018-06-21 10:37:20 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-08-15 17:37:25 +0200 |
| commit | 2883a1f89b50caa8dc1a6cc73d35c8b4642eae20 (patch) | |
| tree | 0aee7e7d4c56de343ed37b2f57848caba33246a8 | |
| parent | aa5de56185a07b1d32f90e1d23a6d4b56fb04a24 (diff) | |
| download | linux-2883a1f89b50caa8dc1a6cc73d35c8b4642eae20.tar.gz | |
x86/topology: Provide topology_smt_supported()
commit f048c399e0f7490ab7296bc2c255d37eb14a9675 upstream.
Provide information whether SMT is supoorted by the CPUs. Preparatory patch
for SMT control mechanism.
Suggested-by: Dave Hansen <dave.hansen@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | arch/x86/include/asm/topology.h | 2 | ||||
| -rw-r--r-- | arch/x86/kernel/smpboot.c | 8 |
2 files changed, 10 insertions, 0 deletions
diff --git a/arch/x86/include/asm/topology.h b/arch/x86/include/asm/topology.h index 661e361a12a6a..453cf38a1c33d 100644 --- a/arch/x86/include/asm/topology.h +++ b/arch/x86/include/asm/topology.h @@ -125,6 +125,7 @@ static inline int topology_max_smt_threads(void) int topology_update_package_map(unsigned int apicid, unsigned int cpu); int topology_phys_to_logical_pkg(unsigned int pkg); bool topology_is_primary_thread(unsigned int cpu); +bool topology_smt_supported(void); #else #define topology_max_packages() (1) static inline int @@ -132,6 +133,7 @@ topology_update_package_map(unsigned int apicid, unsigned int cpu) { return 0; } static inline int topology_phys_to_logical_pkg(unsigned int pkg) { return 0; } static inline int topology_max_smt_threads(void) { return 1; } static inline bool topology_is_primary_thread(unsigned int cpu) { return true; } +static inline bool topology_smt_supported(void) { return false; } #endif static inline void arch_fix_phys_package_id(int num, u32 slot) diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c index 69077d1da991b..85f4788c7c707 100644 --- a/arch/x86/kernel/smpboot.c +++ b/arch/x86/kernel/smpboot.c @@ -280,6 +280,14 @@ bool topology_is_primary_thread(unsigned int cpu) } /** + * topology_smt_supported - Check whether SMT is supported by the CPUs + */ +bool topology_smt_supported(void) +{ + return smp_num_siblings > 1; +} + +/** * topology_phys_to_logical_pkg - Map a physical package id to a logical * * Returns logical package id or -1 if not found |