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| author | Xiao Guangrong <xiaoguangrong@cn.fujitsu.com> | 2011-12-13 00:40:34 +0100 |
|---|---|---|
| committer | Willy Tarreau <w@1wt.eu> | 2012-02-11 15:38:12 +0100 |
| commit | 40a10c277f7ec3f14e7de022c1b74545e4c62401 (patch) | |
| tree | c7bb01ead193cb93fcfc95bb9a7499c01bc9cfb3 | |
| parent | 8669a4b665030d64d19e33e036b1a3e77202b67e (diff) | |
export __get_user_pages_fast() function
commit 45888a0c6edc305495b6bd72a30e66bc40b324c6 upstream.
Backport for stable kernel v2.6.32.y to v2.6.36.y.
Needed for next patch:
oprofile, x86: Fix nmi-unsafe callgraph support
This function is used by KVM to pin process's page in the atomic context.
Define the 'weak' function to avoid other architecture not support it
Acked-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Robert Richter <robert.richter@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Willy Tarreau <w@1wt.eu>
| -rw-r--r-- | mm/util.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/mm/util.c b/mm/util.c index cb00b748ce4..434f9257ed6 100644 --- a/mm/util.c +++ b/mm/util.c @@ -101,6 +101,19 @@ void *__krealloc(const void *p, size_t new_size, gfp_t flags) } EXPORT_SYMBOL(__krealloc); +/* + * Like get_user_pages_fast() except its IRQ-safe in that it won't fall + * back to the regular GUP. + * If the architecture not support this fucntion, simply return with no + * page pinned + */ +int __attribute__((weak)) __get_user_pages_fast(unsigned long start, + int nr_pages, int write, struct page **pages) +{ + return 0; +} +EXPORT_SYMBOL_GPL(__get_user_pages_fast); + /** * krealloc - reallocate memory. The contents will remain unchanged. * @p: object to reallocate memory for. |