The patch titled
tty: remove useless memory barrier
has been added to the -mm tree. Its filename is
tty-remove-useless-memory-barrier.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: tty: remove useless memory barrier
From: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
I don't see why there is a memory barrier in copy_from_read_buf() at all.
Even if it was useful spin_unlock_irqrestore implies a barrier.
Signed-off-by: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Cc: Alan Cox <alan@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
drivers/char/n_tty.c | 1 -
1 file changed, 1 deletion(-)
diff -puN drivers/char/n_tty.c~tty-remove-useless-memory-barrier drivers/char/n_tty.c
--- a/drivers/char/n_tty.c~tty-remove-useless-memory-barrier
+++ a/drivers/char/n_tty.c
@@ -1151,7 +1151,6 @@ static int copy_from_read_buf(struct tty
n = min(*nr, n);
spin_unlock_irqrestore(&tty->read_lock, flags);
if (n) {
- mb();
retval = copy_to_user(*b, &tty->read_buf[tty->read_tail], n);
n -= retval;
spin_lock_irqsave(&tty->read_lock, flags);
_
Patches currently in -mm which might be from ralf@xxxxxxxxxxxxxx are
origin.patch
sysctl-remove-unused-context-param.patch
dont-build-some-broken-isdn-drivers-on-big-endian-mips.patch
mips-dbg_io-stray-brackets-fix.patch
git-mtd.patch
git-net.patch
fix-pnx8550-serial-breakage.patch
pnx8550-uart-driver.patch
pci-legacy-resource-fix.patch
pci-legacy-resource-fix-tidy.patch
tty-remove-useless-memory-barrier.patch
getting-rid-of-all-casts-of-kalloc-calls.patch
-
To unsubscribe from this list: send the line "unsubscribe mm-commits" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
