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alpha: invalidate the local context in flush_tlb_page()

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When the target mm is not the calling CPU's active_mm, flush_tlb_page()
does nothing locally, and smp_call_function() reaches only the other CPUs.
This CPU may still hold translations for the mm and can later reuse the
old ASN together with them.

Add the missing else branch. flush_tlb_other() clears mm->context[cpu] so
a fresh ASN is taken at the next switch. Add this before changing the
current->active_mm test to current->mm: that change will also send lazy
callers here, so their local invalidate must already be in place.

The uniprocessor implementations of flush_tlb_mm() and
flush_icache_user_page() in asm/tlbflush.h and asm/cacheflush.h already
contain exactly this branch.

Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Cc: stable@vger.kernel.org
Reviewed-by: Matt Turner <mattst88@gmail.com>
Signed-off-by: Magnus Lindholm <linmag7@gmail.com>
Link: https://lore.kernel.org/r/20261010142533.974797-5-linmag7@gmail.com
Signed-off-by: Magnus Lindholm <linmag7@gmail.com>
This commit is contained in:
Magnus Lindholm 2026-10-10 16:24:30 +02:00
parent 0d92845ac5
commit c0db730bf0
1 changed files with 3 additions and 0 deletions
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3
arch/alpha/kernel/smp.c
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@ -697,6 +697,9 @@ flush_tlb_page(struct vm_area_struct *vma, unsigned long addr)
preempt_enable();
return;
}
} else {
/* smp_call_function() does not call back into this CPU. */
flush_tlb_other(mm);
}
data.vma = vma;