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| author | Andy Lutomirski <luto@amacapital.net> | 2014-05-05 12:19:31 -0700 |
|---|---|---|
| committer | H. Peter Anvin <hpa@linux.intel.com> | 2014-05-05 13:18:25 -0700 |
| commit | 73159fdcdb9be3eda61b846864352c29371baeb6 (patch) | |
| tree | 9856e06e22e942873f47691e198e7d8531f7db21 /arch/x86/mm/pgtable.c | |
| parent | 89ca3b881987f5a4be4c5dbaa7f0df12bbdde2fd (diff) | |
| download | linux-stable-73159fdcdb9be3eda61b846864352c29371baeb6.tar.gz linux-stable-73159fdcdb9be3eda61b846864352c29371baeb6.tar.bz2 linux-stable-73159fdcdb9be3eda61b846864352c29371baeb6.zip | |
x86, mm: Ensure correct alignment of the fixmap
The early_ioremap code requires that its buffers not span a PMD
boundary. The logic for ensuring that only works if the fixmap is
aligned, so assert that it's aligned correctly.
To make this work reliably, reserve_top_address needs to be
adjusted.
Signed-off-by: Andy Lutomirski <luto@amacapital.net>
Link: http://lkml.kernel.org/r/e59a5f4362661f75dd4841fa74e1f2448045e245.1399317206.git.luto@amacapital.net
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'arch/x86/mm/pgtable.c')
| -rw-r--r-- | arch/x86/mm/pgtable.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/x86/mm/pgtable.c b/arch/x86/mm/pgtable.c index c96314abd144..5f8bdda1d1ba 100644 --- a/arch/x86/mm/pgtable.c +++ b/arch/x86/mm/pgtable.c @@ -449,9 +449,9 @@ void __init reserve_top_address(unsigned long reserve) { #ifdef CONFIG_X86_32 BUG_ON(fixmaps_set > 0); - printk(KERN_INFO "Reserving virtual address space above 0x%08x\n", - (int)-reserve); - __FIXADDR_TOP = -reserve - PAGE_SIZE; + __FIXADDR_TOP = round_down(-reserve, 1 << PMD_SHIFT) - PAGE_SIZE; + printk(KERN_INFO "Reserving virtual address space above 0x%08lx (rounded to 0x%08lx)\n", + -reserve, __FIXADDR_TOP + PAGE_SIZE); #endif } |