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mm: use untagged_addr() for get_user_pages_fast addresses

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Patch series "switch the remaining architectures to use generic GUP", v4.

A series to switch mips, sh and sparc64 to use the generic GUP code so
that we only have one codebase to touch for further improvements to this
code.

This patch (of 16):

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

Link: http://lkml.kernel.org/r/20190625143715.1689-2-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Khalid Aziz <khalid.aziz@oracle.com>
Reviewed-by: Jason Gunthorpe <jgg@mellanox.com>
Cc: Paul Burton <paul.burton@mips.com>
Cc: James Hogan <jhogan@kernel.org>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: Rich Felker <dalias@libc.org>
Cc: David Miller <davem@davemloft.net>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Khalid Aziz <khalid.aziz@oracle.com>
Cc: Andrey Konovalov <andreyknvl@google.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Christoph Hellwig 2019-07-11 20:56:41 -07:00 committed by Linus Torvalds
parent fcf8a1e483
commit f455c85487
1 changed files with 2 additions and 2 deletions
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4
mm/gup.c
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@ -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;