Commit 45888a0c authored by Xiao Guangrong's avatar Xiao Guangrong Committed by Avi Kivity
Browse files

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: default avatarNick Piggin <npiggin@suse.de>
Signed-off-by: default avatarXiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: default avatarMarcelo Tosatti <mtosatti@redhat.com>
parent f392eb25

mm/util.c

+13 −0
Original line number Diff line number Diff line
@@ -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