[PATCH] check pmd type before modifying pte
DORMANTno replies
From: janboe <hidden>
Date: 2009-10-12 15:21:29
Subsystem:
arm port, the rest · Maintainers:
Russell King, Linus Torvalds
This patch could give a warning before modifing pte when pmd type is not correct. Signed-off-by: janboe <redacted> --- arch/arm/mm/mmu.c | 5 +++++ 1 files changed, 5 insertions(+), 0 deletions(-)
diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
index 4426ee6..ac8f27b 100644
--- a/arch/arm/mm/mmu.c
+++ b/arch/arm/mm/mmu.c@@ -487,6 +487,11 @@ static void __init alloc_init_pte(pmd_t *pmd, unsigned long addr, __pmd_populate(pmd, __pa(pte) | type->prot_l1); } + if (pmd_bad(*pmd)) + printk(KERN_WARNING "BUG: mapping for 0x%8lx at 0x%08lx " + "pmd is not correct\n", + __pfn_to_phys(pfn), addr); + pte = pte_offset_kernel(pmd, addr); do { set_pte_ext(pte, pfn_pte(pfn, __pgprot(type->prot_pte)), 0);
--
1.6.3.3