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mempolicy: sanitize the usage of get_task_policy()

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Cleanup + preparation. Every user of get_task_policy() calls it
unconditionally, even if it is not going to use the result.

get_task_policy() is cheap but still this does not look clean, plus
the code looks simpler if get_task_policy() is called only when this
is really needed.

Note: I hope this is correct, but it is not clear why vma_policy_mof()
doesn't fall back to get_task_policy() if ->get_policy() returns NULL.

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 15:27:45 -07:00 • committed by Linus Torvalds
commit 8d90274b3b
1 changed files with 14 additions and 11 deletions
Download patch file Download diff file Expand all files Collapse all files

25
mm/mempolicy.c
View file

@ -1621,14 +1621,11 @@ COMPAT_SYSCALL_DEFINE6(mbind, compat_ulong_t, start, compat_ulong_t, len,
struct mempolicy *get_vma_policy(struct task_struct *task,
struct vm_area_struct *vma, unsigned long addr)
{
struct mempolicy *pol = get_task_policy(task);
struct mempolicy *pol = NULL;
if (vma) {
if (vma->vm_ops && vma->vm_ops->get_policy) {
struct mempolicy *vpol = vma->vm_ops->get_policy(vma,
addr);
if (vpol)
pol = vpol;
pol = vma->vm_ops->get_policy(vma, addr);
} else if (vma->vm_policy) {
pol = vma->vm_policy;
@ -1643,12 +1640,15 @@ struct mempolicy *get_vma_policy(struct task_struct *task,
}
}
if (!pol)
pol = get_task_policy(task);
return pol;
}
bool vma_policy_mof(struct task_struct *task, struct vm_area_struct *vma)
{
struct mempolicy *pol = get_task_policy(task);
struct mempolicy *pol = NULL;
if (vma) {
if (vma->vm_ops && vma->vm_ops->get_policy) {
@ -1660,11 +1660,14 @@ bool vma_policy_mof(struct task_struct *task, struct vm_area_struct *vma)
mpol_cond_put(pol);
return ret;
} else if (vma->vm_policy) {
pol = vma->vm_policy;
}
pol = vma->vm_policy;
}
if (!pol)
pol = get_task_policy(task);
return pol->flags & MPOL_F_MOF;
}
@ -2068,12 +2071,12 @@ retry_cpuset:
*/
struct page *alloc_pages_current(gfp_t gfp, unsigned order)
{
struct mempolicy *pol = get_task_policy(current);
struct mempolicy *pol = &default_policy;
struct page *page;
unsigned int cpuset_mems_cookie;
if (in_interrupt() || (gfp & __GFP_THISNODE))
pol = &default_policy;
if (!in_interrupt() && !(gfp & __GFP_THISNODE))
pol = get_task_policy(current);
retry_cpuset:
cpuset_mems_cookie = read_mems_allowed_begin();