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mm/mmap: use offset_in_page macro 

linux/mm.h provides offset_in_page() macro.  Let's use already predefined
macro instead of (addr & ~PAGE_MASK).

Signed-off-by: Alexander Kuleshov <kuleshovmail@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alexander Kuleshov 2015-11-05 18:46:54 -08:00 committed by Linus Torvalds
parent 891c49abfb
commit de1741a133
1 changed files with 6 additions and 6 deletions
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12
mm/mmap.c
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@ -1302,7 +1302,7 @@ unsigned long do_mmap(struct file *file, unsigned long addr,
* that it represents a valid section of the address space.
*/
addr = get_unmapped_area(file, addr, len, pgoff, flags);
if (addr & ~PAGE_MASK)
if (offset_in_page(addr))
return addr;
/* Do simple checking here so the lower-level routines won't have
@ -1473,7 +1473,7 @@ SYSCALL_DEFINE1(old_mmap, struct mmap_arg_struct __user *, arg)
if (copy_from_user(&a, arg, sizeof(a)))
return -EFAULT;
if (a.offset & ~PAGE_MASK)
if (offset_in_page(a.offset))
return -EINVAL;
return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd,
@ -1989,7 +1989,7 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
* can happen with large stack limits and large mmap()
* allocations.
*/
if (addr & ~PAGE_MASK) {
if (offset_in_page(addr)) {
VM_BUG_ON(addr != -ENOMEM);
info.flags = 0;
info.low_limit = TASK_UNMAPPED_BASE;
@ -2025,7 +2025,7 @@ get_unmapped_area(struct file *file, unsigned long addr, unsigned long len,
if (addr > TASK_SIZE - len)
return -ENOMEM;
if (addr & ~PAGE_MASK)
if (offset_in_page(addr))
return -EINVAL;
addr = arch_rebalance_pgtables(addr, len);
@ -2535,7 +2535,7 @@ int do_munmap(struct mm_struct *mm, unsigned long start, size_t len)
unsigned long end;
struct vm_area_struct *vma, *prev, *last;
if ((start & ~PAGE_MASK) || start > TASK_SIZE || len > TASK_SIZE-start)
if ((offset_in_page(start)) || start > TASK_SIZE || len > TASK_SIZE-start)
return -EINVAL;
len = PAGE_ALIGN(len);
@ -2733,7 +2733,7 @@ static unsigned long do_brk(unsigned long addr, unsigned long len)
flags = VM_DATA_DEFAULT_FLAGS | VM_ACCOUNT | mm->def_flags;
error = get_unmapped_area(NULL, addr, len, 0, MAP_FIXED);
if (error & ~PAGE_MASK)
if (offset_in_page(error))
return error;
error = mlock_future_check(mm, mm->def_flags, len);