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authorMichael S. Tsirkin <mst@redhat.com>2018-04-13 15:35:23 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2018-04-13 17:10:27 -0700
commitd081107867b85cc7454b9d4f5aea47f65bcf06d1 (patch)
tree4cd38640b68f5b53262a2a1e354e3c6efc131103 /arch/sparc/mm
parentget_user_pages_fast(): return -EFAULT on access_ok failure (diff)
downloadlinux-dev-d081107867b85cc7454b9d4f5aea47f65bcf06d1.tar.xz
linux-dev-d081107867b85cc7454b9d4f5aea47f65bcf06d1.zip
mm/gup.c: document return value
__get_user_pages_fast handles errors differently from get_user_pages_fast: the former always returns the number of pages pinned, the later might return a negative error code. Link: http://lkml.kernel.org/r/1522962072-182137-6-git-send-email-mst@redhat.com Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Andrew Morton <akpm@linux-foundation.org> Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Huang Ying <ying.huang@intel.com> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Thorsten Leemhuis <regressions@leemhuis.info> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/sparc/mm')
-rw-r--r--arch/sparc/mm/gup.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/sparc/mm/gup.c b/arch/sparc/mm/gup.c
index 357b6047653a..aee6dba83d0e 100644
--- a/arch/sparc/mm/gup.c
+++ b/arch/sparc/mm/gup.c
@@ -193,6 +193,10 @@ static int gup_pud_range(pgd_t pgd, unsigned long addr, unsigned long end,
return 1;
}
+/*
+ * Note a difference with get_user_pages_fast: this always returns the
+ * number of pages pinned, 0 if no pages were pinned.
+ */
int __get_user_pages_fast(unsigned long start, int nr_pages, int write,
struct page **pages)
{