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x86, iomap: Fix wrong page aligned size calculation in ioremapping code 

x86 early_iounmap(): fix off-by-one error in page alignment of allocation
size for sizes where size%PAGE_SIZE==1.

Signed-off-by: Florian Zumbiehl <florz@florz.de>
LKML-Reference: <201007202219.o6KMJlES021058@imap1.linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
Florian Zumbiehl 2010-07-20 15:19:47 -07:00 committed by H. Peter Anvin
parent 92851e2fca
commit 468c30f2bb
1 changed files with 1 additions and 1 deletions
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2
arch/x86/mm/ioremap.c
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@ -611,7 +611,7 @@ void __init early_iounmap(void __iomem *addr, unsigned long size)
return;
}
offset = virt_addr & ~PAGE_MASK;
nrpages = PAGE_ALIGN(offset + size - 1) >> PAGE_SHIFT;
nrpages = PAGE_ALIGN(offset + size) >> PAGE_SHIFT;
idx = FIX_BTMAP_BEGIN - NR_FIX_BTMAPS*slot;
while (nrpages > 0) {