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mm: add the "struct mm_struct *mm" local into 

Cosmetic, but expand_upwards() and expand_downwards() overuse vma->vm_mm,
a local variable makes sense imho.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Hugh Dickins <hughd@google.com>
Cc: Andrey Konovalov <andreyknvl@google.com>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: "Kirill A. Shutemov" <kirill@shutemov.name>
Cc: Sasha Levin <sasha.levin@oracle.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
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 2015-11-05 18:48:17 -08:00 committed by Linus Torvalds
parent 87e8827b37
commit 0935781477
1 changed files with 13 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
mm/mmap.c
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@ -2148,6 +2148,7 @@ static int acct_stack_growth(struct vm_area_struct *vma, unsigned long size, uns
*/
int expand_upwards(struct vm_area_struct *vma, unsigned long address)
{
struct mm_struct *mm = vma->vm_mm;
int error;
if (!(vma->vm_flags & VM_GROWSUP))
@ -2197,10 +2198,10 @@ int expand_upwards(struct vm_area_struct *vma, unsigned long address)
* So, we reuse mm->page_table_lock to guard
* against concurrent vma expansions.
*/
spin_lock(&vma->vm_mm->page_table_lock);
spin_lock(&mm->page_table_lock);
if (vma->vm_flags & VM_LOCKED)
vma->vm_mm->locked_vm += grow;
vm_stat_account(vma->vm_mm, vma->vm_flags,
mm->locked_vm += grow;
vm_stat_account(mm, vma->vm_flags,
vma->vm_file, grow);
anon_vma_interval_tree_pre_update_vma(vma);
vma->vm_end = address;
@ -2208,8 +2209,8 @@ int expand_upwards(struct vm_area_struct *vma, unsigned long address)
if (vma->vm_next)
vma_gap_update(vma->vm_next);
else
vma->vm_mm->highest_vm_end = address;
spin_unlock(&vma->vm_mm->page_table_lock);
mm->highest_vm_end = address;
spin_unlock(&mm->page_table_lock);
perf_event_mmap(vma);
}
@ -2217,7 +2218,7 @@ int expand_upwards(struct vm_area_struct *vma, unsigned long address)
}
vma_unlock_anon_vma(vma);
khugepaged_enter_vma_merge(vma, vma->vm_flags);
validate_mm(vma->vm_mm);
validate_mm(mm);
return error;
}
#endif /* CONFIG_STACK_GROWSUP || CONFIG_IA64 */
@ -2228,6 +2229,7 @@ int expand_upwards(struct vm_area_struct *vma, unsigned long address)
int expand_downwards(struct vm_area_struct *vma,
unsigned long address)
{
struct mm_struct *mm = vma->vm_mm;
int error;
/*
@ -2272,17 +2274,17 @@ int expand_downwards(struct vm_area_struct *vma,
* So, we reuse mm->page_table_lock to guard
* against concurrent vma expansions.
*/
spin_lock(&vma->vm_mm->page_table_lock);
spin_lock(&mm->page_table_lock);
if (vma->vm_flags & VM_LOCKED)
vma->vm_mm->locked_vm += grow;
vm_stat_account(vma->vm_mm, vma->vm_flags,
mm->locked_vm += grow;
vm_stat_account(mm, vma->vm_flags,
vma->vm_file, grow);
anon_vma_interval_tree_pre_update_vma(vma);
vma->vm_start = address;
vma->vm_pgoff -= grow;
anon_vma_interval_tree_post_update_vma(vma);
vma_gap_update(vma);
spin_unlock(&vma->vm_mm->page_table_lock);
spin_unlock(&mm->page_table_lock);
perf_event_mmap(vma);
}
@ -2290,7 +2292,7 @@ int expand_downwards(struct vm_area_struct *vma,
}
vma_unlock_anon_vma(vma);
khugepaged_enter_vma_merge(vma, vma->vm_flags);
validate_mm(vma->vm_mm);
validate_mm(mm);
return error;
}