This patch removes the usage of shortcut to send smp_call_function using ALL_BUT_SELF
shortcut. This is a problem for an upcomming CPU, and is still not ready to take
this interrupt. Since cpu_online_map is updated with the call_lock held, this
mechanism should avoid sending IPI to cpu's not yet prepared to participate in this
party.
Signed-off-by: Ashok Raj <[email protected]>
----------------------------------------
smp.c | 10 ++++++++--
1 files changed, 8 insertions(+), 2 deletions(-)
Index: linux-2.6.12-rc4-mm2/arch/x86_64/kernel/smp.c
===================================================================
--- linux-2.6.12-rc4-mm2.orig/arch/x86_64/kernel/smp.c 2005-05-20 13:14:27.000000000 -0700
+++ linux-2.6.12-rc4-mm2/arch/x86_64/kernel/smp.c 2005-05-20 13:14:38.000000000 -0700
@@ -315,8 +315,10 @@
int nonatomic, int wait)
{
struct call_data_struct data;
- int cpus = num_online_cpus()-1;
+ cpumask_t cpu_mask;
+ int cpus;
+ cpus = num_online_cpus() - 1;
if (!cpus)
return;
@@ -327,10 +329,14 @@
if (wait)
atomic_set(&data.finished, 0);
+ cpu_mask = cpu_online_map;
+ cpu_clear(smp_processor_id(), cpu_mask);
+
call_data = &data;
wmb();
+
/* Send a message to all other CPUs and wait for them to respond */
- send_IPI_allbutself(CALL_FUNCTION_VECTOR);
+ send_IPI_mask(cpu_mask, CALL_FUNCTION_VECTOR);
/* Wait for response */
while (atomic_read(&data.started) != cpus)
--
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
