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Two fixes for the SMP related functionality: 

- Make the UP version of smp_call_function_single() match SMP semantics
    when called for a not available CPU.  Instead of emitting a warning and
    assuming that the function call target is CPU0, return a proper error
    code like the SMP version does.
 
  - Remove a superfluous check in smp_call_function_many_cond()
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Merge tag 'smp-urgent-2020-02-09' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull SMP fixes from Thomas Gleixner:
 "Two fixes for the SMP related functionality:

   - Make the UP version of smp_call_function_single() match SMP
     semantics when called for a not available CPU. Instead of emitting
     a warning and assuming that the function call target is CPU0,
     return a proper error code like the SMP version does.

   - Remove a superfluous check in smp_call_function_many_cond()"

* tag 'smp-urgent-2020-02-09' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  smp/up: Make smp_call_function_single() match SMP semantics
  smp: Remove superfluous cond_func check in smp_call_function_many_cond()
This commit is contained in:
Linus Torvalds 2020-02-09 12:09:43 -08:00
parent ca21b9b370 1e474b28e7
commit f41377609a
2 changed files with 3 additions and 2 deletions
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2
kernel/smp.c
View File

@ -435,7 +435,7 @@ static void smp_call_function_many_cond(const struct cpumask *mask,
/* Fastpath: do that cpu by itself. */
if (next_cpu >= nr_cpu_ids) {
if (!cond_func || (cond_func && cond_func(cpu, info)))
if (!cond_func || cond_func(cpu, info))
smp_call_function_single(cpu, func, info, wait);
return;
}

3
kernel/up.c
View File

@ -14,7 +14,8 @@ int smp_call_function_single(int cpu, void (*func) (void *info), void *info,
{
unsigned long flags;
WARN_ON(cpu != 0);
if (cpu != 0)
return -ENXIO;
local_irq_save(flags);
func(info);