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authorRusty Russell <rusty@rustcorp.com.au>2015-06-01 08:23:53 +0200
committerTony Luck <tony.luck@intel.com>2015-06-02 19:07:03 +0200
commit5eda7861e347ffe927ecde5abd74d7b13ae938fa (patch)
treecd5018b6c1b4a2ccf584faaa2f74e642d973a28b /arch/ia64/kernel/smpboot.c
parentLinux 4.1-rc6 (diff)
downloadlinux-5eda7861e347ffe927ecde5abd74d7b13ae938fa.tar.xz
linux-5eda7861e347ffe927ecde5abd74d7b13ae938fa.zip
ia64: make cpu_callin_map non-volatile.
cpumask_test_cpu() doesn't take volatile, unlike the obsoleted cpu_isset. The only place ia64 really cares is the spin waiting for a bit; udelay() is probably a barrier but insert barrier() to be sure. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to '')
-rw-r--r--arch/ia64/kernel/smpboot.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/ia64/kernel/smpboot.c b/arch/ia64/kernel/smpboot.c
index 15051e9c2c6f..b054c5c6e713 100644
--- a/arch/ia64/kernel/smpboot.c
+++ b/arch/ia64/kernel/smpboot.c
@@ -127,7 +127,7 @@ int smp_num_siblings = 1;
volatile int ia64_cpu_to_sapicid[NR_CPUS];
EXPORT_SYMBOL(ia64_cpu_to_sapicid);
-static volatile cpumask_t cpu_callin_map;
+static cpumask_t cpu_callin_map;
struct smp_boot_data smp_boot_data __initdata;
@@ -477,6 +477,7 @@ do_boot_cpu (int sapicid, int cpu, struct task_struct *idle)
for (timeout = 0; timeout < 100000; timeout++) {
if (cpumask_test_cpu(cpu, &cpu_callin_map))
break; /* It has booted */
+ barrier(); /* Make sure we re-read cpu_callin_map */
udelay(100);
}
Dprintk("\n");