From: Paolo 'Blaisorblade' Giarrusso <[email protected]>
This comment is a bit unclear and also stale. So fix it. Thanks to Hugh Dickins
for explaining me what it really referred to, and correcting my first fix.
Signed-off-by: Paolo 'Blaisorblade' Giarrusso <[email protected]>
Index: linux-2.6.git/mm/fremap.c
===================================================================
--- linux-2.6.git.orig/mm/fremap.c
+++ linux-2.6.git/mm/fremap.c
@@ -208,9 +208,10 @@ asmlinkage long sys_remap_file_pages(uns
pgoff, flags & MAP_NONBLOCK);
/*
- * We can't clear VM_NONLINEAR because we'd have to do
- * it after ->populate completes, and that would prevent
- * downgrading the lock. (Locks can't be upgraded).
+ * We would like to clear VM_NONLINEAR, in the case when
+ * sys_remap_file_pages covers the whole vma, so making
+ * it linear again. But cannot do so until after a
+ * successful populate, and have no way to upgrade sem.
*/
}
if (likely(!has_write_lock))
--
Inform me of my mistakes, so I can keep imitating Homer Simpson's "Doh!".
Paolo Giarrusso, aka Blaisorblade (Skype ID "PaoloGiarrusso", ICQ 215621894)
http://www.user-mode-linux.org/~blaisorblade
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