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mempolicy: kill do_set_mempolicy()->down_write(&mm->mmap_sem)

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Remove down_write(&mm->mmap_sem) in do_set_mempolicy(). This logic
was never correct and it is no longer needed, see the previous patch.

Signed-off-by: Oleg Nesterov <[email protected]>
Cc: KAMEZAWA Hiroyuki <[email protected]>
Cc: David Rientjes <[email protected]>
Cc: KOSAKI Motohiro <[email protected]>
Cc: Alexander Viro <[email protected]>
Cc: Cyrill Gorcunov <[email protected]>
Cc: "Eric W. Biederman" <[email protected]>
Cc: "Kirill A. Shutemov" <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Hugh Dickins <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Naoya Horiguchi <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Oleg Nesterov 2014-10-09 15:27:55 -07:00 • committed by Linus Torvalds
commit 2c7c3a7d08
1 changed files with 1 additions and 14 deletions
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15
mm/mempolicy.c
View file

@ -802,7 +802,6 @@ static long do_set_mempolicy(unsigned short mode, unsigned short flags,
nodemask_t *nodes)
{
struct mempolicy *new, *old;
struct mm_struct *mm = current->mm;
NODEMASK_SCRATCH(scratch);
int ret;
@ -814,20 +813,11 @@ static long do_set_mempolicy(unsigned short mode, unsigned short flags,
ret = PTR_ERR(new);
goto out;
}
/*
* prevent changing our mempolicy while show_numa_maps()
* is using it.
* Note: do_set_mempolicy() can be called at init time
* with no 'mm'.
*/
if (mm)
down_write(&mm->mmap_sem);
task_lock(current);
ret = mpol_set_nodemask(new, nodes, scratch);
if (ret) {
task_unlock(current);
if (mm)
up_write(&mm->mmap_sem);
mpol_put(new);
goto out;
}
@ -837,9 +827,6 @@ static long do_set_mempolicy(unsigned short mode, unsigned short flags,
nodes_weight(new->v.nodes))
current->il_next = first_node(new->v.nodes);
task_unlock(current);
if (mm)
up_write(&mm->mmap_sem);
mpol_put(old);
ret = 0;
out: