From: "Kirill A. Shutemov" <kirill.shute...@linux.intel.com>
Make arch_get_unmapped_area() return unmapped area aligned to HPAGE_MASK
if the file mapping can have huge pages.
Signed-off-by: Kirill A. Shutemov <kirill.shute...@linux.intel.com>
---
arch/x86/kernel/sys_x86_64.c | 13 +++++++++++--
1 file changed, 11 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kernel/sys_x86_64.c b/arch/x86/kernel/sys_x86_64.c
index dbded5a..4e20cd5 100644
--- a/arch/x86/kernel/sys_x86_64.c
+++ b/arch/x86/kernel/sys_x86_64.c
@@ -15,6 +15,7 @@
#include <linux/random.h>
#include <linux/uaccess.h>
#include <linux/elf.h>
+#include <linux/pagemap.h>
#include <asm/ia32.h>
#include <asm/syscalls.h>
@@ -135,7 +136,11 @@ arch_get_unmapped_area(struct file *filp, unsigned long
addr,
info.length = len;
info.low_limit = begin;
info.high_limit = end;
- info.align_mask = filp ? get_align_mask() : 0;
+ if (filp)
+ info.align_mask = mapping_can_have_hugepages(filp->f_mapping) ?
+ PAGE_MASK & ~HPAGE_MASK : get_align_mask();
+ else
+ info.align_mask = 0;
info.align_offset = pgoff << PAGE_SHIFT;
return vm_unmapped_area(&info);
}
@@ -174,7 +179,11 @@ arch_get_unmapped_area_topdown(struct file *filp, const
unsigned long addr0,
info.length = len;
info.low_limit = PAGE_SIZE;
info.high_limit = mm->mmap_base;
- info.align_mask = filp ? get_align_mask() : 0;
+ if (filp)
+ info.align_mask = mapping_can_have_hugepages(filp->f_mapping) ?
+ PAGE_MASK & ~HPAGE_MASK : get_align_mask();
+ else
+ info.align_mask = 0;
info.align_offset = pgoff << PAGE_SHIFT;
addr = vm_unmapped_area(&info);
if (!(addr & ~PAGE_MASK))
--
1.7.10.4
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