The patch titled
i386: remove redundant might_sleep() in user accessors.
has been added to the -mm tree. Its filename is
i386-remove-redundant-might_sleep-in-user-accessors.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: i386: remove redundant might_sleep() in user accessors.
From: Vadim Lobanov <vlobanov@xxxxxxxxxxxxx>
On i386, the user space accessor functions copy_from/to_user() both invoke
might_sleep(), do a quick sanity check, and then pass the work on to their
__copy_from/to_user() counterparts, which again invoke might_sleep().
Given that no actual work happens between these two calls, it is best to
eliminate one of the redundant might_sleep()s.
Signed-off-by: Vadim Lobanov <vlobanov@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
arch/i386/lib/usercopy.c | 2 --
1 file changed, 2 deletions(-)
diff -puN arch/i386/lib/usercopy.c~i386-remove-redundant-might_sleep-in-user-accessors arch/i386/lib/usercopy.c
--- a/arch/i386/lib/usercopy.c~i386-remove-redundant-might_sleep-in-user-accessors
+++ a/arch/i386/lib/usercopy.c
@@ -843,7 +843,6 @@ unsigned long __copy_from_user_ll_nocach
unsigned long
copy_to_user(void __user *to, const void *from, unsigned long n)
{
- might_sleep();
BUG_ON((long) n < 0);
if (access_ok(VERIFY_WRITE, to, n))
n = __copy_to_user(to, from, n);
@@ -870,7 +869,6 @@ EXPORT_SYMBOL(copy_to_user);
unsigned long
copy_from_user(void *to, const void __user *from, unsigned long n)
{
- might_sleep();
BUG_ON((long) n < 0);
if (access_ok(VERIFY_READ, from, n))
n = __copy_from_user(to, from, n);
_
Patches currently in -mm which might be from vlobanov@xxxxxxxxxxxxx are
i386-remove-redundant-might_sleep-in-user-accessors.patch
remove-open_max-check-from-poll-syscall.patch
-
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