mm: use dedicated helper to access rlimit value

Use rlimit() helper instead of manually writing whole chain from current
task to rlim_cur.

Link: http://lkml.kernel.org/r/20170705172811.8027-1-k.opasiak@samsung.com
Signed-off-by: Krzysztof Opasiak <k.opasiak@samsung.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/mmap.c b/mm/mmap.c
index 49c56b8..7fa6759 100644 (file)
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -2177,7 +2177,6 @@ static int acct_stack_growth(struct vm_area_struct *vma,
                             unsigned long size, unsigned long grow)
 {
        struct mm_struct *mm = vma->vm_mm;
-       struct rlimit *rlim = current->signal->rlim;
        unsigned long new_start;
 
        /* address space limit tests */
@@ -2185,7 +2184,7 @@ static int acct_stack_growth(struct vm_area_struct *vma,
                return -ENOMEM;
 
        /* Stack limit test */
-       if (size > READ_ONCE(rlim[RLIMIT_STACK].rlim_cur))
+       if (size > rlimit(RLIMIT_STACK))
                return -ENOMEM;
 
        /* mlock limit tests */
@@ -2193,7 +2192,7 @@ static int acct_stack_growth(struct vm_area_struct *vma,
                unsigned long locked;
                unsigned long limit;
                locked = mm->locked_vm + grow;
-               limit = READ_ONCE(rlim[RLIMIT_MEMLOCK].rlim_cur);
+               limit = rlimit(RLIMIT_MEMLOCK);
                limit >>= PAGE_SHIFT;
                if (locked > limit && !capable(CAP_IPC_LOCK))
                        return -ENOMEM;