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authorMilton Miller <miltonm@bga.com>2011-05-10 19:29:06 +0000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2011-05-19 14:30:46 +1000
commite04763713286b1e00e1c2a33fe2741caf9470f2b (patch)
tree0c02b77b7a063c7e240dd953e6c7bd9965eff020 /arch
parent2a116f3dd07cbb55b440d3841fc24a0b3fd99ccd (diff)
powerpc: Remove call sites of MSG_ALL_BUT_SELF
The only user of MSG_ALL_BUT_SELF in the whole kernel tree is powerpc, and it only uses it to start the debugger. Both debuggers always call smp_send_debugger_break with MSG_ALL_BUT_SELF, and only mpic can do anything more optimal than a loop over all online cpus, but all message passing implementations have to code for this special delivery target. Convert smp_send_debugger_break to take void and loop calling the smp_ops message_pass function for each of the other cpus in the online cpumask. Use raw_smp_processor_id() because we are either entering the debugger or trying to start kdump and the additional warning it not useful were it to trigger. Signed-off-by: Milton Miller <miltonm@bga.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/powerpc/include/asm/smp.h2
-rw-r--r--arch/powerpc/kernel/kgdb.c2
-rw-r--r--arch/powerpc/kernel/smp.c19
-rw-r--r--arch/powerpc/xmon/xmon.c2
4 files changed, 16 insertions, 9 deletions
diff --git a/arch/powerpc/include/asm/smp.h b/arch/powerpc/include/asm/smp.h
index 50873493a97..91472c56800 100644
--- a/arch/powerpc/include/asm/smp.h
+++ b/arch/powerpc/include/asm/smp.h
@@ -35,7 +35,7 @@ extern void cpu_die(void);
#ifdef CONFIG_SMP
-extern void smp_send_debugger_break(int cpu);
+extern void smp_send_debugger_break(void);
extern void smp_message_recv(int);
extern void start_secondary_resume(void);
diff --git a/arch/powerpc/kernel/kgdb.c b/arch/powerpc/kernel/kgdb.c
index 42850ee00ad..bd9d35f59cf 100644
--- a/arch/powerpc/kernel/kgdb.c
+++ b/arch/powerpc/kernel/kgdb.c
@@ -109,7 +109,7 @@ static int kgdb_call_nmi_hook(struct pt_regs *regs)
#ifdef CONFIG_SMP
void kgdb_roundup_cpus(unsigned long flags)
{
- smp_send_debugger_break(MSG_ALL_BUT_SELF);
+ smp_send_debugger_break();
}
#endif
diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
index 87517ab6d36..b7441144692 100644
--- a/arch/powerpc/kernel/smp.c
+++ b/arch/powerpc/kernel/smp.c
@@ -218,11 +218,18 @@ void arch_send_call_function_ipi_mask(const struct cpumask *mask)
smp_ops->message_pass(cpu, PPC_MSG_CALL_FUNCTION);
}
-#ifdef CONFIG_DEBUGGER
-void smp_send_debugger_break(int cpu)
+#if defined(CONFIG_DEBUGGER) || defined(CONFIG_KEXEC)
+void smp_send_debugger_break(void)
{
- if (likely(smp_ops))
- smp_ops->message_pass(cpu, PPC_MSG_DEBUGGER_BREAK);
+ int cpu;
+ int me = raw_smp_processor_id();
+
+ if (unlikely(!smp_ops))
+ return;
+
+ for_each_online_cpu(cpu)
+ if (cpu != me)
+ smp_ops->message_pass(cpu, PPC_MSG_DEBUGGER_BREAK);
}
#endif
@@ -230,9 +237,9 @@ void smp_send_debugger_break(int cpu)
void crash_send_ipi(void (*crash_ipi_callback)(struct pt_regs *))
{
crash_ipi_function_ptr = crash_ipi_callback;
- if (crash_ipi_callback && smp_ops) {
+ if (crash_ipi_callback) {
mb();
- smp_ops->message_pass(MSG_ALL_BUT_SELF, PPC_MSG_DEBUGGER_BREAK);
+ smp_send_debugger_break();
}
}
#endif
diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c
index 91309c5c00d..42541bbcc7f 100644
--- a/arch/powerpc/xmon/xmon.c
+++ b/arch/powerpc/xmon/xmon.c
@@ -437,7 +437,7 @@ static int xmon_core(struct pt_regs *regs, int fromipi)
xmon_owner = cpu;
mb();
if (ncpus > 1) {
- smp_send_debugger_break(MSG_ALL_BUT_SELF);
+ smp_send_debugger_break();
/* wait for other cpus to come in */
for (timeout = 100000000; timeout != 0; --timeout) {
if (cpumask_weight(&cpus_in_xmon) >= ncpus)