mirrors/linux
2
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2026-07-22 02:17:36 -04:00
Code Issues Packages Projects Releases Wiki Activity

topology: Introduce cpu_smt_mask for CONFIG_SCHED_SMT=n

Browse Source 
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
This commit is contained in:
Shrikanth Hegde
2026-05-15 22:54:53 +05:30
committed by Peter Zijlstra
parent 6d2051403d
commit 815c5cb76a
1 changed files with 14 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

15
include/linux/topology.h
View File

@@ -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