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authorRusty Russell <rusty@rustcorp.com.au>2008-08-12 17:52:52 -0500
committerRusty Russell <rusty@rustcorp.com.au>2008-08-12 17:52:53 +1000
commit912985dce45ef18fcdd9f5439fef054e0e22302a (patch)
tree394b3be51134bddef200f86dde48aa3e3c7ae94c /mm/util.c
parent40c42076ebd362dc69210cccea101ac80b6d4bd4 (diff)
downloadlinux-912985dce45ef18fcdd9f5439fef054e0e22302a.tar.gz
mm: Make generic weak get_user_pages_fast and EXPORT_GPL it
Out of line get_user_pages_fast fallback implementation, make it a weak symbol, get rid of CONFIG_HAVE_GET_USER_PAGES_FAST. Export the symbol to modules so lguest can use it. Signed-off-by: Nick Piggin <npiggin@suse.de> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'mm/util.c')
-rw-r--r--mm/util.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/mm/util.c b/mm/util.c
index 9341ca77bd8..cb00b748ce4 100644
--- a/mm/util.c
+++ b/mm/util.c
@@ -171,3 +171,18 @@ void arch_pick_mmap_layout(struct mm_struct *mm)
mm->unmap_area = arch_unmap_area;
}
#endif
+
+int __attribute__((weak)) get_user_pages_fast(unsigned long start,
+ int nr_pages, int write, struct page **pages)
+{
+ struct mm_struct *mm = current->mm;
+ int ret;
+
+ down_read(&mm->mmap_sem);
+ ret = get_user_pages(current, mm, start, nr_pages,
+ write, 0, pages, NULL);
+ up_read(&mm->mmap_sem);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(get_user_pages_fast);