From 5efe92c68045817b97927b748f369d407c1d89ab Mon Sep 17 00:00:00 2001
From: David Howells <dhowells@redhat.com>
Date: Tue, 19 Feb 2008 18:58:54 +0000
Subject: MN10300: Introduce barriers to replace removed volatiles in gdbstub
Introduce into the MN10300 gdbstub a couple of barrier() calls to replace the
removed volatility of the input/output index variables for the Rx ring buffer.
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
arch/mn10300/kernel/gdb-io-ttysm.c | 2 ++
1 file changed, 2 insertions(+)
(limited to 'arch/mn10300')
diff --git a/arch/mn10300/kernel/gdb-io-ttysm.c b/arch/mn10300/kernel/gdb-io-ttysm.c
index c5451592d403..e94c25e8ca05 100644
--- a/arch/mn10300/kernel/gdb-io-ttysm.c
+++ b/arch/mn10300/kernel/gdb-io-ttysm.c
@@ -196,6 +196,7 @@ int gdbstub_io_rx_char(unsigned char *_ch, int nonblock)
try_again:
/* pull chars out of the buffer */
ix = gdbstub_rx_outp;
+ barrier();
if (ix == gdbstub_rx_inp) {
if (nonblock)
return -EAGAIN;
@@ -207,6 +208,7 @@ try_again:
ch = gdbstub_rx_buffer[ix++];
st = gdbstub_rx_buffer[ix++];
+ barrier();
gdbstub_rx_outp = ix & (PAGE_SIZE - 1);
st &= SC01STR_RXF | SC01STR_RBF | SC01STR_FEF | SC01STR_PEF |
--
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