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smp: Get this_cpu once in smp_call_function

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smp_call_function_single() and smp_call_function_many_cond() disable
preemption and cache the CPU number via get_cpu().

Use this cached value throughout the function instead of invoking
smp_processor_id() again.

[ tglx: Make the copy&pasta'ed change log match the patch ]

Signed-off-by: Shrikanth Hegde <sshegde@linux.ibm.com>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Reviewed-by: Mukesh Kumar Chaurasiya (IBM) <mkchauras@gmail.com>
Link: https://patch.msgid.link/20260323193630.640311-4-sshegde@linux.ibm.com
This commit is contained in:
Shrikanth Hegde
2026-03-24 01:06:29 +05:30
committed by Thomas Gleixner
parent cc5623947f
commit ec39780d6a
1 changed files with 2 additions and 2 deletions
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4
kernel/smp.c
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@@ -678,7 +678,7 @@ int smp_call_function_single(int cpu, smp_call_func_t func, void *info,
csd->func = func;
csd->info = info;
#ifdef CONFIG_CSD_LOCK_WAIT_DEBUG
csd->node.src = smp_processor_id();
csd->node.src = this_cpu;
csd->node.dst = cpu;
#endif
@@ -833,7 +833,7 @@ static void smp_call_function_many_cond(const struct cpumask *mask,
csd->func = func;
csd->info = info;
#ifdef CONFIG_CSD_LOCK_WAIT_DEBUG
csd->node.src = smp_processor_id();
csd->node.src = this_cpu;
csd->node.dst = cpu;
#endif
trace_csd_queue_cpu(cpu, _RET_IP_, func, csd);