A-Team_Digital_Solutions/android_kernel_motorola_sm6375
Watch
2
0
Fork
You've already forked android_kernel_motorola_sm6375
 0
mirror of https://github.com/BobTheBlinker/android_kernel_motorola_sm6375.git synced 2026-10-28 02:32:09 -04:00
Code Issues Projects Releases Packages Wiki Activity

mempolicy: fixup Fallback for Default Shmem Policy

Browse source 
get_vma_policy() is not handling fallback to task policy correctly when the
get_policy() vm_op returns NULL.  The NULL overwrites the 'pol' variable that
was holding the fallback task mempolicy.  So, it was falling back directly to
system default policy.

Fix get_vma_policy() to use only non-NULL policy returned from the vma
get_policy op.

shm_get_policy() was falling back to current task's mempolicy if the "backing
file system" [tmpfs vs hugetlbfs] does not support the get_policy vm_op and
the vma policy is null.  This is incorrect for show_numa_maps() which is
likely querying the numa_maps of some task other than current.  Remove this
fallback.

Signed-off-by: Lee Schermerhorn <[email protected]>
Cc: Christoph Lameter <[email protected]>
Cc: David Rientjes <[email protected]>
Cc: Mel Gorman <[email protected]>
Cc: Andi Kleen <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Lee Schermerhorn 2008-04-28 02:13:11 -07:00 • committed by Linus Torvalds
commit ae4d8c16aa
2 changed files with 6 additions and 4 deletions
Download patch file Download diff file Expand all files Collapse all files

3
ipc/shm.c
View file

@ -274,8 +274,7 @@ static struct mempolicy *shm_get_policy(struct vm_area_struct *vma,
else if (vma->vm_policy) {
pol = vma->vm_policy;
mpol_get(pol); /* get_vma_policy() expects this */
} else
pol = current->mempolicy;
}
return pol;
}
#endif