From 69b1415e934fc1a796a817e32d84162ae65962f5 Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Wed, 13 Feb 2008 11:04:50 +0100 Subject: [PATCH] x86: cpa: ensure page alignment the cpa API is page aligned - warn about any weird alignments. Signed-off-by: Thomas Gleixner Signed-off-by: Ingo Molnar --- arch/x86/mm/pageattr.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c index bd61ed13f9cf..5d2259468d3c 100644 --- a/arch/x86/mm/pageattr.c +++ b/arch/x86/mm/pageattr.c @@ -688,6 +688,15 @@ static int change_page_attr_set_clr(unsigned long addr, int numpages, if (!pgprot_val(mask_set) && !pgprot_val(mask_clr)) return 0; + /* Ensure we are PAGE_SIZE aligned */ + if (addr & ~PAGE_MASK) { + addr &= PAGE_MASK; + /* + * People should not be passing in unaligned addresses: + */ + WARN_ON_ONCE(1); + } + cpa.vaddr = addr; cpa.numpages = numpages; cpa.mask_set = mask_set; -- 2.20.1