Commit b9ef323e authored by Nicholas Piggin's avatar Nicholas Piggin Committed by Michael Ellerman
Browse files

powerpc/64s: Disable preemption in hash lazy mmu mode 



apply_to_page_range on kernel pages does not disable preemption, which
is a requirement for hash's lazy mmu mode, which keeps track of the
TLBs to flush with a per-cpu array.

Reported-by: default avatarGuenter Roeck <linux@roeck-us.net>
Signed-off-by: default avatarNicholas Piggin <npiggin@gmail.com>
Tested-by: default avatarGuenter Roeck <linux@roeck-us.net>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20221013151647.1857994-1-npiggin@gmail.com
parent b12eb279

arch/powerpc/include/asm/book3s/64/tlbflush-hash.h

+6 −0
Original line number Diff line number Diff line
@@ -32,6 +32,11 @@ static inline void arch_enter_lazy_mmu_mode(void) 


	if (radix_enabled())

		return;

	/*

	 * apply_to_page_range can call us this preempt enabled when

	 * operating on kernel page tables.

	 */

	preempt_disable();

	batch = this_cpu_ptr(&ppc64_tlb_batch);

	batch->active = 1;

}
@@ -47,6 +52,7 @@ static inline void arch_leave_lazy_mmu_mode(void) 
	if (batch->index)

		__flush_tlb_pending(batch);

	batch->active = 0;

	preempt_enable();

}



#define arch_flush_lazy_mmu_mode()      do {} while (0)