xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

powerpc/mm/radix: Use mm->task_size for boundary checking instead of addr_limit

Browse Source 
We don't init addr_limit correctly for 32 bit applications. So default to using
mm->task_size for boundary condition checking. We use addr_limit to only control
free space search. This makes sure that we do the right thing with 32 bit
applications.

We should consolidate the usage of TASK_SIZE/mm->task_size and
mm->context.addr_limit later.

This partially reverts commit fbfef9027c (powerpc/mm: Switch some
TASK_SIZE checks to use mm_context addr_limit).

Fixes: fbfef9027c ("powerpc/mm: Switch some TASK_SIZE checks to use mm_context addr_limit")
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Aneesh Kumar K.V
2017-04-14 00:48:21 +05:30
committed by Michael Ellerman
parent 8d1b48ef58
commit be77e999e3
4 changed files with 10 additions and 10 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
arch/powerpc/mm/hugetlbpage-radix.c
View File

@@ -55,7 +55,7 @@ radix__hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
if (len & ~huge_page_mask(h))
return -EINVAL;
if (len > mm->context.addr_limit)
if (len > mm->task_size)
return -ENOMEM;
if (flags & MAP_FIXED) {
@@ -67,7 +67,7 @@ radix__hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
if (addr) {
addr = ALIGN(addr, huge_page_size(h));
vma = find_vma(mm, addr);
if (mm->context.addr_limit - len >= addr &&
if (mm->task_size - len >= addr &&
(!vma || addr + len <= vma->vm_start))
return addr;
}