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Merge tag 'powerpc-6.4-5' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux

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Pull powerpc fix from Michael Ellerman:

 - Disable IRQs when switching mm in exit_lazy_flush_tlb() called from
   exit_mmap()

Thanks to Nicholas Piggin and Sachin Sant.

* tag 'powerpc-6.4-5' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
  powerpc/64s/radix: Fix exit lazy tlb mm switch with irqs enabled
This commit is contained in:
Linus Torvalds
2023-06-22 17:49:40 -07:00
parent 4a426aa1a2 dfaed3e1fa
commit e7758c0ddb
1 changed files with 9 additions and 1 deletions
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10
arch/powerpc/mm/book3s64/radix_tlb.c
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@@ -795,12 +795,20 @@ void exit_lazy_flush_tlb(struct mm_struct *mm, bool always_flush)
goto out;
if (current->active_mm == mm) {
unsigned long flags;
WARN_ON_ONCE(current->mm != NULL);
/* Is a kernel thread and is using mm as the lazy tlb */
/*
* It is a kernel thread and is using mm as the lazy tlb, so
* switch it to init_mm. This is not always called from IPI
* (e.g., flush_type_needed), so must disable irqs.
*/
local_irq_save(flags);
mmgrab_lazy_tlb(&init_mm);
current->active_mm = &init_mm;
switch_mm_irqs_off(mm, &init_mm, current);
mmdrop_lazy_tlb(mm);
local_irq_restore(flags);
}
/*