diff options
| author | Chris Dearman <chris@mips.com> | 2009-07-10 02:06:38 -0700 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2009-11-02 12:00:05 +0100 |
| commit | 2ee0a42961c942c6a2fb70700ef4e25c0acf5fca (patch) | |
| tree | 0006eb6324a92e428e6832a48f9a3b432db7d600 | |
| parent | cea2be444380fc1bf665cd023ed84be7e0872d28 (diff) | |
MIPS: CMP: Fix memory barriers for correct operation of amon_cpu_start
Signed-off-by: Chris Dearman (chris@mips.com)
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
| -rw-r--r-- | arch/mips/mti-malta/malta-amon.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/arch/mips/mti-malta/malta-amon.c b/arch/mips/mti-malta/malta-amon.c index df9e526312a..469d9b0cee6 100644 --- a/arch/mips/mti-malta/malta-amon.c +++ b/arch/mips/mti-malta/malta-amon.c @@ -70,11 +70,12 @@ void amon_cpu_start(int cpu, launch->sp = sp; launch->a0 = a0; - /* Make sure target sees parameters before the go bit */ - smp_mb(); - + smp_wmb(); /* Target must see parameters before go */ launch->flags |= LAUNCH_FGO; + smp_wmb(); /* Target must see go before we poll */ + while ((launch->flags & LAUNCH_FGONE) == 0) ; + smp_rmb(); /* Target will be updating flags soon */ pr_debug("launch: cpu%d gone!\n", cpu); } |