| | Date | Sun, 05 Feb 2012 23:10:52 +0100 | | From | Willy Tarreau <> | | Subject | [PATCH 63/91] export __get_user_pages_fast() function |
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2.6.27-longterm review patch. If anyone has any objections, please let us know.
------------------ 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> --- mm/util.c | 13 +++++++++++++ 1 files changed, 13 insertions(+), 0 deletions(-) Index: longterm-2.6.27/mm/util.c =================================================================== --- longterm-2.6.27.orig/mm/util.c 2012-02-05 22:34:33.070915063 +0100 +++ longterm-2.6.27/mm/util.c 2012-02-05 22:34:43.848914804 +0100 @@ -101,6 +101,19 @@ } 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.
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