diff options
| author | Shrikanth Hegde <sshegde@linux.ibm.com> | 2026-05-15 22:54:53 +0530 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2026-05-19 12:17:36 +0200 |
| commit | 815c5cb76a3e5dad4fc3911b9073591dc3a29282 (patch) | |
| tree | d5131b34302b092fdcc2e0c917045a7047ba1ed5 /include/linux | |
| parent | 6d2051403d6c93832d3058a1b275c6aef2c97f44 (diff) | |
topology: Introduce cpu_smt_mask for CONFIG_SCHED_SMT=n
Define cpu_smt_mask in case of CONFIG_SCHED_SMT=n as cpumask_of that
CPU. With that config, it is expected that kernel treats each CPU
as individual core. Using cpumask_of(cpu) reflects that.
This would help to get rid of the ifdeffery that is spread across
the codebase since cpu_smt_mask is defined only in case of
CONFIG_SCHED_SMT=y.
Note: There is no arch today which defines cpu_smt_mask unconditionally.
So likely defining the cpu_smt_mask shouldn't lead redefinition errors.
Signed-off-by: Shrikanth Hegde <sshegde@linux.ibm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Phil Auld <pauld@redhat.com>
Reviewed-by: Valentin Schneider <vschneid@redhat.com>
Tested-by: K Prateek Nayak <kprateek.nayak@amd.com>
Link: https://patch.msgid.link/20260515172456.542799-2-sshegde@linux.ibm.com
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/topology.h | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/include/linux/topology.h b/include/linux/topology.h index 6575af39fd10..709a2dcf4c73 100644 --- a/include/linux/topology.h +++ b/include/linux/topology.h @@ -230,11 +230,24 @@ static inline int cpu_to_mem(int cpu) #define topology_drawer_cpumask(cpu) cpumask_of(cpu) #endif -#if defined(CONFIG_SCHED_SMT) && !defined(cpu_smt_mask) +/* + * Defining cpu_smt_mask as cpumask_of that CPU helps to get + * rid of lot of ifdeffery all around the codebase in case of + * CONFIG_SCHED_SMT=n. It just means there are no other siblings, which + * is what is expected. + */ +#if defined(CONFIG_SCHED_SMT) +# if !defined(cpu_smt_mask) static inline const struct cpumask *cpu_smt_mask(int cpu) { return topology_sibling_cpumask(cpu); } +# endif +#else /* !CONFIG_SCHED_SMT */ +static inline const struct cpumask *cpu_smt_mask(int cpu) +{ + return cpumask_of(cpu); +} #endif #ifndef topology_is_primary_thread |