diff options
authorJon Medhurst (Tixy) <tixy@linaro.org>2012-11-28 11:17:51 +0000
committerArve Hjønnevåg <arve@android.com>2013-04-29 14:52:35 -0700
commite55b2706376c702cc8667231632bc42b4d183281 (patch)
parent849474a22dca43374068b7cd6ca2a56a912ed3be (diff)
ARM: mm: Allow an empty PMD in alloc_init_pte()
The Android patch titled "ARM: allow the kernel text section to be made read-only" modifies alloc_init_pte() and adds a BUG_ON to detect the case where a section mapping is being overwritten. However the test doesn't allow for the legitimate case where the PMD is empty, as can happen for kernels built with CONFIG_ARM_LPAE. So extend the test to allow this. Change-Id: I28eeaefd856bae63a5532980e41e0fd4d8922e79 Signed-off-by: Jon Medhurst <tixy@linaro.org> Signed-off-by: John Stultz <john.stultz@linaro.org>
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
index 37486f03df5..a3da603504d 100644
--- a/arch/arm/mm/mmu.c
+++ b/arch/arm/mm/mmu.c
@@ -610,7 +610,7 @@ static void __init alloc_init_pte(pmd_t *pmd, unsigned long addr,
pte_t *pte = start_pte + pte_index(addr);
/* If replacing a section mapping, the whole section must be replaced */
- BUG_ON(pmd_bad(*pmd) && ((addr | end) & ~PMD_MASK));
+ BUG_ON(!pmd_none(*pmd) && pmd_bad(*pmd) && ((addr | end) & ~PMD_MASK));
do {
set_pte_ext(pte, pfn_pte(pfn, __pgprot(type->prot_pte)), 0);