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treewide: Trace IPIs sent via smp_send_reschedule()

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To be able to trace invocations of smp_send_reschedule(), rename the
arch-specific definitions of it to arch_smp_send_reschedule() and wrap it
into an smp_send_reschedule() that contains a tracepoint.

Changes to include the declaration of the tracepoint were driven by the
following coccinelle script:

  @func_use@
  @@
  smp_send_reschedule(...);

  @include@
  @@
  #include <trace/events/ipi.h>

  @no_include depends on func_use && !include@
  @@
    #include <...>
  +
  + #include <trace/events/ipi.h>

[csky bits]
[riscv bits]
Signed-off-by: Valentin Schneider <vschneid@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Guo Ren <guoren@kernel.org>
Acked-by: Palmer Dabbelt <palmer@rivosinc.com>
Link: https://lore.kernel.org/r/20230307143558.294354-6-vschneid@redhat.com
This commit is contained in:
Valentin Schneider
2023-03-07 14:35:56 +00:00
committed by Peter Zijlstra
parent 4468161a5c
commit 4c8c3c7f70
27 changed files with 53 additions and 26 deletions
Download Patch File Download Diff File Expand all files Collapse all files

11
include/linux/smp.h
View File

@@ -125,8 +125,15 @@ extern void smp_send_stop(void);
/*
* sends a 'reschedule' event to another CPU:
*/
extern void smp_send_reschedule(int cpu);
extern void arch_smp_send_reschedule(int cpu);
/*
* scheduler_ipi() is inline so can't be passed as callback reason, but the
* callsite IP should be sufficient for root-causing IPIs sent from here.
*/
#define smp_send_reschedule(cpu) ({ \
trace_ipi_send_cpumask(cpumask_of(cpu), _RET_IP_, NULL); \
arch_smp_send_reschedule(cpu); \
})
/*
* Prepare machine for booting other CPUs.