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mm/gup: rename nr as nr_pinned in get_user_pages_fast() 

To better reflect the held state of pages and make code self-explaining,
rename nr as nr_pinned.

Signed-off-by: Pingfan Liu <kernelfans@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: John Hubbard <jhubbard@nvidia.com>
Cc: Ira Weiny <ira.weiny@intel.com>
Cc: Mike Rapoport <rppt@linux.ibm.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Link: http://lkml.kernel.org/r/1584876733-17405-2-git-send-email-kernelfans@gmail.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Pingfan Liu 2020-04-01 21:06:00 -07:00 committed by Linus Torvalds
parent f28d43636d
commit 4628b063d2
1 changed files with 13 additions and 13 deletions
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26
mm/gup.c
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@ -2637,7 +2637,7 @@ int __get_user_pages_fast(unsigned long start, int nr_pages, int write,
{
unsigned long len, end;
unsigned long flags;
int nr = 0;
int nr_pinned = 0;
/*
* Internally (within mm/gup.c), gup fast variants must set FOLL_GET,
* because gup fast is always a "pin with a +1 page refcount" request.
@ -2671,11 +2671,11 @@ int __get_user_pages_fast(unsigned long start, int nr_pages, int write,
if (IS_ENABLED(CONFIG_HAVE_FAST_GUP) &&
gup_fast_permitted(start, end)) {
local_irq_save(flags);
gup_pgd_range(start, end, gup_flags, pages, &nr);
gup_pgd_range(start, end, gup_flags, pages, &nr_pinned);
local_irq_restore(flags);
}
return nr;
return nr_pinned;
}
EXPORT_SYMBOL_GPL(__get_user_pages_fast);
@ -2707,7 +2707,7 @@ static int internal_get_user_pages_fast(unsigned long start, int nr_pages,
struct page **pages)
{
unsigned long addr, len, end;
int nr = 0, ret = 0;
int nr_pinned = 0, ret = 0;
if (WARN_ON_ONCE(gup_flags & ~(FOLL_WRITE | FOLL_LONGTERM |
FOLL_FORCE | FOLL_PIN | FOLL_GET)))
@ -2726,25 +2726,25 @@ static int internal_get_user_pages_fast(unsigned long start, int nr_pages,
if (IS_ENABLED(CONFIG_HAVE_FAST_GUP) &&
gup_fast_permitted(start, end)) {
local_irq_disable();
gup_pgd_range(addr, end, gup_flags, pages, &nr);
gup_pgd_range(addr, end, gup_flags, pages, &nr_pinned);
local_irq_enable();
ret = nr;
ret = nr_pinned;
}
if (nr < nr_pages) {
if (nr_pinned < nr_pages) {
/* Try to get the remaining pages with get_user_pages */
start += nr << PAGE_SHIFT;
pages += nr;
start += nr_pinned << PAGE_SHIFT;
pages += nr_pinned;
ret = __gup_longterm_unlocked(start, nr_pages - nr,
ret = __gup_longterm_unlocked(start, nr_pages - nr_pinned,
gup_flags, pages);
/* Have to be a bit careful with return values */
if (nr > 0) {
if (nr_pinned > 0) {
if (ret < 0)
ret = nr;
ret = nr_pinned;
else
ret += nr;
ret += nr_pinned;
}
}