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H A D | radix_tlb.c | dfaed3e1 Tue Jun 06 19:56:00 CDT 2023 Nicholas Piggin <npiggin@gmail.com> powerpc/64s/radix: Fix exit lazy tlb mm switch with irqs enabled
Switching mm and tinkering with current->active_mm should be done with irqs disabled. There is a path where exit_lazy_flush_tlb can be called with irqs enabled:
exit_lazy_flush_tlb flush_type_needed __flush_all_mm tlb_finish_mmu exit_mmap
Which results in the switching being done with irqs enabled, which is incorrect.
Fixes: a665eec0a22e ("powerpc/64s/radix: Fix mm_cpumask trimming race vs kthread_use_mm") Cc: stable@vger.kernel.org # v5.10+ Reported-by: Sachin Sant <sachinp@linux.ibm.com> Link: https://lore.kernel.org/linuxppc-dev/A9A5D83D-BA70-47A4-BCB4-30C1AE19BC22@linux.ibm.com/ Tested-by: Sachin Sant <sachinp@linux.ibm.com> Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://msgid.link/20230607005601.583293-1-npiggin@gmail.com
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