aboutsummaryrefslogtreecommitdiff
path: root/mm/util.c
diff options
context:
space:
mode:
authorXiao Guangrong <xiaoguangrong@cn.fujitsu.com>2010-08-22 19:08:57 +0800
committerAvi Kivity <avi@redhat.com>2010-10-24 10:51:24 +0200
commit45888a0c6edc305495b6bd72a30e66bc40b324c6 (patch)
tree0f25d2133c8e7d80e7daca039ed383371562ee8e /mm/util.c
parentf392eb2546170e539668a5ab8df6c1254d15a201 (diff)
downloadlinux-45888a0c6edc305495b6bd72a30e66bc40b324c6.tar.gz
export __get_user_pages_fast() function
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>
Diffstat (limited to 'mm/util.c')
-rw-r--r--mm/util.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/mm/util.c b/mm/util.c
index 4735ea48181..73dac81e9f7 100644
--- a/mm/util.c
+++ b/mm/util.c
@@ -245,6 +245,19 @@ void arch_pick_mmap_layout(struct mm_struct *mm)
}
#endif
+/*
+ * 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);
+
/**
* get_user_pages_fast() - pin user pages in memory
* @start: starting user address