From: Sebastian Andrzej Siewior Date: Mon, 11 Mar 2013 21:37:27 +0100 Subject: [PATCH 217/353] arm/highmem: Flush tlb on unmap Origin: https://git.kernel.org/cgit/linux/kernel/git/rt/linux-stable-rt.git/commit?id=aa0deea1ec74cc60877cfc0ba29d1912148efec1 The tlb should be flushed on unmap and thus make the mapping entry invalid. This is only done in the non-debug case which does not look right. Signed-off-by: Sebastian Andrzej Siewior --- arch/arm/mm/highmem.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm/mm/highmem.c b/arch/arm/mm/highmem.c index d02f8187b1cc..eb4b225d28c9 100644 --- a/arch/arm/mm/highmem.c +++ b/arch/arm/mm/highmem.c @@ -112,10 +112,10 @@ void __kunmap_atomic(void *kvaddr) __cpuc_flush_dcache_area((void *)vaddr, PAGE_SIZE); #ifdef CONFIG_DEBUG_HIGHMEM BUG_ON(vaddr != __fix_to_virt(idx)); - set_fixmap_pte(idx, __pte(0)); #else (void) idx; /* to kill a warning */ #endif + set_fixmap_pte(idx, __pte(0)); kmap_atomic_idx_pop(); } else if (vaddr >= PKMAP_ADDR(0) && vaddr < PKMAP_ADDR(LAST_PKMAP)) { /* this address was obtained through kmap_high_get() */