diff options
| author | Yinghai Lu <yhlu.kernel@gmail.com> | 2008-07-10 20:38:26 -0700 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-07-11 10:24:04 +0200 |
| commit | f361a450bf1ad14e2b003217dbf3958638631265 (patch) | |
| tree | 10c1e4dcc0047f6c37387cada6a0bceba088d2d2 /arch/x86/mm/pat.c | |
| parent | f302a5bbe5eb95f3d4227d5bd0e9b92b1b125f4f (diff) | |
x86: introduce max_low_pfn_mapped for 64-bit
when more than 4g memory is installed, don't map the big hole below 4g.
Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/mm/pat.c')
| -rw-r--r-- | arch/x86/mm/pat.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/x86/mm/pat.c b/arch/x86/mm/pat.c index a885a1019b8a..749766c3c5cd 100644 --- a/arch/x86/mm/pat.c +++ b/arch/x86/mm/pat.c @@ -449,7 +449,8 @@ int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn, if (retval < 0) return 0; - if (pfn <= max_pfn_mapped && + if (((pfn <= max_low_pfn_mapped) || + (pfn >= (1UL<<(32 - PAGE_SHIFT)) && pfn <= max_pfn_mapped)) && ioremap_change_attr((unsigned long)__va(offset), size, flags) < 0) { free_memtype(offset, offset + size); printk(KERN_INFO |