linux-kernel - [PATCHv8 1/2] mm/gup: rename nr as nr_pinned in get_user_pages

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Message-Id: <1584876733-17405-2-git-send-email-kernelfans@gmail.com>
Date:   Sun, 22 Mar 2020 19:32:12 +0800
From:   Pingfan Liu <kernelfans@...il.com>
To:     linux-mm@...ck.org
Cc:     Pingfan Liu <kernelfans@...il.com>,
        Ira Weiny <ira.weiny@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Matthew Wilcox <willy@...radead.org>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>,
        Christoph Hellwig <hch@...radead.org>,
        Shuah Khan <shuah@...nel.org>, Jason Gunthorpe <jgg@...pe.ca>,
        linux-kernel@...r.kernel.org
Subject: [PATCHv8 1/2] 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@...il.com>
Reviewed-by: John Hubbard <jhubbard@...dia.com>
Cc: Ira Weiny <ira.weiny@...el.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Mike Rapoport <rppt@...ux.ibm.com>
Cc: Dan Williams <dan.j.williams@...el.com>
Cc: Matthew Wilcox <willy@...radead.org>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>
Cc: Christoph Hellwig <hch@...radead.org>
Cc: Shuah Khan <shuah@...nel.org>
Cc: Jason Gunthorpe <jgg@...pe.ca>
To: linux-mm@...ck.org
Cc: linux-kernel@...r.kernel.org
---
 mm/gup.c | 26 +++++++++++++-------------
 1 file changed, 13 insertions(+), 13 deletions(-)

diff --git a/mm/gup.c b/mm/gup.c
index e8aaa40..02a95b1 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -2665,7 +2665,7 @@ 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.
@@ -2699,11 +2699,11 @@ 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);

@@ -2735,7 +2735,7 @@ 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)))
@@ -2754,25 +2754,25 @@ 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;
 		}
 	}

--
2.7.5