2019-06-13 15:34:23

by Pingfan Liu

Subject: [PATCHv4 1/3] 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 <[email protected]>
Cc: Ira Weiny <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Mike Rapoport <[email protected]>
Cc: Dan Williams <[email protected]>
Cc: Matthew Wilcox <[email protected]>
Cc: John Hubbard <[email protected]>
Cc: "Aneesh Kumar K.V" <[email protected]>
Cc: Keith Busch <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: Shuah Khan <[email protected]>
Cc: [email protected]
---
mm/gup.c | 20 ++++++++++----------
1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/mm/gup.c b/mm/gup.c
index f173fcb..766ae54 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -2216,7 +2216,7 @@ int get_user_pages_fast(unsigned long start, int nr_pages,
unsigned int gup_flags, struct page **pages)
{
unsigned long addr, len, end;
- int nr = 0, ret = 0;
+ int nr_pinned = 0, ret = 0;

start &= PAGE_MASK;
addr = start;
@@ -2231,25 +2231,25 @@ int get_user_pages_fast(unsigned long start, int nr_pages,

if (gup_fast_permitted(start, nr_pages)) {
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;
}
}

--
2.7.5

2019-06-13 21:27:41

by Ira Weiny

Subject: Re: [PATCHv4 1/3] mm/gup: rename nr as nr_pinned in get_user_pages_fast()

On Thu, Jun 13, 2019 at 06:45:00PM +0800, Pingfan Liu wrote:
> To better reflect the held state of pages and make code self-explaining,
> rename nr as nr_pinned.
>
> Signed-off-by: Pingfan Liu <[email protected]>

Reviewed-by: Ira Weiny <[email protected]>

> Cc: Andrew Morton <[email protected]>
> Cc: Mike Rapoport <[email protected]>
> Cc: Dan Williams <[email protected]>
> Cc: Matthew Wilcox <[email protected]>
> Cc: John Hubbard <[email protected]>
> Cc: "Aneesh Kumar K.V" <[email protected]>
> Cc: Keith Busch <[email protected]>
> Cc: Christoph Hellwig <[email protected]>
> Cc: Shuah Khan <[email protected]>
> Cc: [email protected]
> ---
> mm/gup.c | 20 ++++++++++----------
> 1 file changed, 10 insertions(+), 10 deletions(-)
>
> diff --git a/mm/gup.c b/mm/gup.c
> index f173fcb..766ae54 100644
> --- a/mm/gup.c
> +++ b/mm/gup.c
> @@ -2216,7 +2216,7 @@ int get_user_pages_fast(unsigned long start, int nr_pages,
> unsigned int gup_flags, struct page **pages)
> {
> unsigned long addr, len, end;
> - int nr = 0, ret = 0;
> + int nr_pinned = 0, ret = 0;
>
> start &= PAGE_MASK;
> addr = start;
> @@ -2231,25 +2231,25 @@ int get_user_pages_fast(unsigned long start, int nr_pages,
>
> if (gup_fast_permitted(start, nr_pages)) {
> 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;
> }
> }
>
> --
> 2.7.5
>