[01/16] mm: use untagged_addr() for get_user_pages_fast addresses

Commit Message

Christoph Hellwig June 25, 2019, 2:37 p.m. UTC

This will allow sparc64, or any future architecture with memory tagging
to override its tags for get_user_pages and get_user_pages_fast.

Signed-off-by: Christoph Hellwig <[e-mail]>
Reviewed-by: Khalid Aziz <[e-mail]>
Reviewed-by: Jason Gunthorpe <[e-mail]>
---
 mm/gup.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

Patch

diff --git a/mm/gup.c b/mm/gup.c
index ddde097cf9e4..6bb521db67ec 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -2146,7 +2146,7 @@  int __get_user_pages_fast(unsigned long start, int nr_pages, int write,
 	unsigned long flags;
 	int nr = 0;
 
-	start &= PAGE_MASK;
+	start = untagged_addr(start) & PAGE_MASK;
 	len = (unsigned long) nr_pages << PAGE_SHIFT;
 	end = start + len;
 
@@ -2219,7 +2219,7 @@  int get_user_pages_fast(unsigned long start, int nr_pages,
 	unsigned long addr, len, end;
 	int nr = 0, ret = 0;
 
-	start &= PAGE_MASK;
+	start = untagged_addr(start) & PAGE_MASK;
 	addr = start;
 	len = (unsigned long) nr_pages << PAGE_SHIFT;
 	end = start + len;