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| author | David Howells <dhowells@redhat.com> | 2008-02-19 18:58:54 +0000 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2008-02-19 15:51:36 -0800 |
| commit | 5efe92c68045817b97927b748f369d407c1d89ab (patch) | |
| tree | c42dcc6799cac1f56dd8073b0205dc5ecb2beb4f /arch/mn10300/kernel | |
| parent | 2b79aac9038ee52fd8d89216b1a3ec9bd8285fac (diff) | |
| download | op-kernel-dev-5efe92c68045817b97927b748f369d407c1d89ab.zip op-kernel-dev-5efe92c68045817b97927b748f369d407c1d89ab.tar.gz | |
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>
Diffstat (limited to 'arch/mn10300/kernel')
| -rw-r--r-- | arch/mn10300/kernel/gdb-io-ttysm.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/mn10300/kernel/gdb-io-ttysm.c b/arch/mn10300/kernel/gdb-io-ttysm.c index c545159..e94c25e 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 | |
