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mm: remove unnecessary local variable addr in __get_user_pages_fast()

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The local variable `addr' in __get_user_pages_fast() is just a shadow of
`start'.  Since `start' never changes after assignment to `addr', it is
fine to replace `start' with it.

Also the meaning of [start, end] is more obvious than [addr, end] when
passed to gup_pgd_range().

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Wei Yang <[email protected]>
Reviewed-by: Andrew Morton <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Wei Yang 2018-10-26 15:07:55 -07:00 • committed by Linus Torvalds
commit d4faa40259
1 changed files with 2 additions and 3 deletions
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5
mm/gup.c
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@ -1780,12 +1780,11 @@ bool gup_fast_permitted(unsigned long start, int nr_pages, int write)
int __get_user_pages_fast(unsigned long start, int nr_pages, int write,
struct page **pages)
{
unsigned long addr, len, end;
unsigned long len, end;
unsigned long flags;
int nr = 0;
start &= PAGE_MASK;
addr = start;
len = (unsigned long) nr_pages << PAGE_SHIFT;
end = start + len;
@ -1807,7 +1806,7 @@ int __get_user_pages_fast(unsigned long start, int nr_pages, int write,
if (gup_fast_permitted(start, nr_pages, write)) {
local_irq_save(flags);
gup_pgd_range(addr, end, write, pages, &nr);
gup_pgd_range(start, end, write, pages, &nr);
local_irq_restore(flags);
}