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mm: mempolicy: turn vma_set_policy() into vma_dup_policy()

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Simple cleanup.  Every user of vma_set_policy() does the same work, this
looks a bit annoying imho.  And the new trivial helper which does
mpol_dup() + vma_set_policy() to simplify the callers.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Rik van Riel <riel@redhat.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Oleg Nesterov 2013-09-11 14:20:14 -07:00 committed by Linus Torvalds
parent c07303c0af
commit ef0855d334
4 changed files with 25 additions and 20 deletions
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9
include/linux/mempolicy.h
View File

@ -91,7 +91,6 @@ static inline struct mempolicy *mpol_dup(struct mempolicy *pol)
}
#define vma_policy(vma) ((vma)->vm_policy)
#define vma_set_policy(vma, pol) ((vma)->vm_policy = (pol))
static inline void mpol_get(struct mempolicy *pol)
{
@ -126,6 +125,7 @@ struct shared_policy {
spinlock_t lock;
};
int vma_dup_policy(struct vm_area_struct *src, struct vm_area_struct *dst);
void mpol_shared_policy_init(struct shared_policy *sp, struct mempolicy *mpol);
int mpol_set_shared_policy(struct shared_policy *info,
struct vm_area_struct *vma,
@ -240,7 +240,12 @@ mpol_shared_policy_lookup(struct shared_policy *sp, unsigned long idx)
}
#define vma_policy(vma) NULL
#define vma_set_policy(vma, pol) do {} while(0)
static inline int
vma_dup_policy(struct vm_area_struct *src, struct vm_area_struct *dst)
{
return 0;
}
static inline void numa_policy_init(void)
{

9
kernel/fork.c
View File

@ -351,7 +351,6 @@ static int dup_mmap(struct mm_struct *mm, struct mm_struct *oldmm)
struct rb_node **rb_link, *rb_parent;
int retval;
unsigned long charge;
struct mempolicy *pol;
uprobe_start_dup_mmap();
down_write(&oldmm->mmap_sem);
@ -400,11 +399,9 @@ static int dup_mmap(struct mm_struct *mm, struct mm_struct *oldmm)
goto fail_nomem;
*tmp = *mpnt;
INIT_LIST_HEAD(&tmp->anon_vma_chain);
pol = mpol_dup(vma_policy(mpnt));
retval = PTR_ERR(pol);
if (IS_ERR(pol))
retval = vma_dup_policy(mpnt, tmp);
if (retval)
goto fail_nomem_policy;
vma_set_policy(tmp, pol);
tmp->vm_mm = mm;
if (anon_vma_fork(tmp, mpnt))
goto fail_nomem_anon_vma_fork;
@ -472,7 +469,7 @@ static int dup_mmap(struct mm_struct *mm, struct mm_struct *oldmm)
uprobe_end_dup_mmap();
return retval;
fail_nomem_anon_vma_fork:
mpol_put(pol);
mpol_put(vma_policy(tmp));
fail_nomem_policy:
kmem_cache_free(vm_area_cachep, tmp);
fail_nomem:

10
mm/mempolicy.c
View File

@ -2065,6 +2065,16 @@ struct page *alloc_pages_current(gfp_t gfp, unsigned order)
}
EXPORT_SYMBOL(alloc_pages_current);
int vma_dup_policy(struct vm_area_struct *src, struct vm_area_struct *dst)
{
struct mempolicy *pol = mpol_dup(vma_policy(src));
if (IS_ERR(pol))
return PTR_ERR(pol);
dst->vm_policy = pol;
return 0;
}
/*
* If mpol_dup() sees current->cpuset == cpuset_being_rebound, then it
* rebinds the mempolicy its copying by calling mpol_rebind_policy()

17
mm/mmap.c
View File

@ -2380,7 +2380,6 @@ detach_vmas_to_be_unmapped(struct mm_struct *mm, struct vm_area_struct *vma,
static int __split_vma(struct mm_struct * mm, struct vm_area_struct * vma,
unsigned long addr, int new_below)
{
struct mempolicy *pol;
struct vm_area_struct *new;
int err = -ENOMEM;
@ -2404,12 +2403,9 @@ static int __split_vma(struct mm_struct * mm, struct vm_area_struct * vma,
new->vm_pgoff += ((addr - vma->vm_start) >> PAGE_SHIFT);
}
pol = mpol_dup(vma_policy(vma));
if (IS_ERR(pol)) {
err = PTR_ERR(pol);
err = vma_dup_policy(vma, new);
if (err)
goto out_free_vma;
}
vma_set_policy(new, pol);
if (anon_vma_clone(new, vma))
goto out_free_mpol;
@ -2437,7 +2433,7 @@ static int __split_vma(struct mm_struct * mm, struct vm_area_struct * vma,
fput(new->vm_file);
unlink_anon_vmas(new);
out_free_mpol:
mpol_put(pol);
mpol_put(vma_policy(new));
out_free_vma:
kmem_cache_free(vm_area_cachep, new);
out_err:
@ -2780,7 +2776,6 @@ struct vm_area_struct *copy_vma(struct vm_area_struct **vmap,
struct mm_struct *mm = vma->vm_mm;
struct vm_area_struct *new_vma, *prev;
struct rb_node **rb_link, *rb_parent;
struct mempolicy *pol;
bool faulted_in_anon_vma = true;
/*
@ -2825,10 +2820,8 @@ struct vm_area_struct *copy_vma(struct vm_area_struct **vmap,
new_vma->vm_start = addr;
new_vma->vm_end = addr + len;
new_vma->vm_pgoff = pgoff;
pol = mpol_dup(vma_policy(vma));
if (IS_ERR(pol))
if (vma_dup_policy(vma, new_vma))
goto out_free_vma;
vma_set_policy(new_vma, pol);
INIT_LIST_HEAD(&new_vma->anon_vma_chain);
if (anon_vma_clone(new_vma, vma))
goto out_free_mempol;
@ -2843,7 +2836,7 @@ struct vm_area_struct *copy_vma(struct vm_area_struct **vmap,
return new_vma;
out_free_mempol:
mpol_put(pol);
mpol_put(vma_policy(new_vma));
out_free_vma:
kmem_cache_free(vm_area_cachep, new_vma);
return NULL;