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author | Xiao Guangrong <xiaoguangrong@cn.fujitsu.com> | 2010-08-22 07:08:57 -0400 |
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committer | Avi Kivity <avi@redhat.com> | 2010-10-24 04:51:24 -0400 |
commit | 45888a0c6edc305495b6bd72a30e66bc40b324c6 (patch) | |
tree | 0f25d2133c8e7d80e7daca039ed383371562ee8e | |
parent | f392eb2546170e539668a5ab8df6c1254d15a201 (diff) |
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>
-rw-r--r-- | mm/util.c | 13 |
1 files changed, 13 insertions, 0 deletions
@@ -245,6 +245,19 @@ void arch_pick_mmap_layout(struct mm_struct *mm) | |||
245 | } | 245 | } |
246 | #endif | 246 | #endif |
247 | 247 | ||
248 | /* | ||
249 | * Like get_user_pages_fast() except its IRQ-safe in that it won't fall | ||
250 | * back to the regular GUP. | ||
251 | * If the architecture not support this fucntion, simply return with no | ||
252 | * page pinned | ||
253 | */ | ||
254 | int __attribute__((weak)) __get_user_pages_fast(unsigned long start, | ||
255 | int nr_pages, int write, struct page **pages) | ||
256 | { | ||
257 | return 0; | ||
258 | } | ||
259 | EXPORT_SYMBOL_GPL(__get_user_pages_fast); | ||
260 | |||
248 | /** | 261 | /** |
249 | * get_user_pages_fast() - pin user pages in memory | 262 | * get_user_pages_fast() - pin user pages in memory |
250 | * @start: starting user address | 263 | * @start: starting user address |