Revert "Move xen patchset to new version's subdir."

[people/pmueller/ipfire-2.x.git] / src / patches / suse-2.6.27.25 / patches.arch / x86_sgi_cpus4096-01-fix-smp_call_function.patch

diff --git a/src/patches/suse-2.6.27.25/patches.arch/x86_sgi_cpus4096-01-fix-smp_call_function.patch b/src/patches/suse-2.6.27.25/patches.arch/x86_sgi_cpus4096-01-fix-smp_call_function.patch
new file mode 100644 (file)
index 0000000..e2fe56f
--- /dev/null
+++ b/src/patches/suse-2.6.27.25/patches.arch/x86_sgi_cpus4096-01-fix-smp_call_function.patch
@@ -0,0 +1,72 @@
+From: Mike Travis <travis@sgi.com>
+Date: Fri, 5 Sep 2008 14:40:20 -0700
+Subject: [PATCH] smp: reduce stack requirements for smp_call_function_mask
+References: bnc#425240 FATE304266
+Patch-mainline: 2.6.28
+
+* Cleanup cpumask_t usages in smp_call_function_mask to remove stack
+    overflow problem when NR_CPUS=4096.  This removes over 1000 bytes
+    from the stack with NR_CPUS=4096.
+
+Signed-off-by: Mike Travis <travis@sgi.com>
+Signed-off-by: Ingo Molnar <mingo@elte.hu>
+Signed-off-by: Jiri Slaby <jslaby@suse.cz>
+Signed-off-by: Thomas Renninger <trenn@suse.de>
+---
+ kernel/smp.c |   12 +++++-------
+ 1 files changed, 5 insertions(+), 7 deletions(-)
+
+diff --git a/kernel/smp.c b/kernel/smp.c
+index f362a85..069d066 100644
+--- a/kernel/smp.c
++++ b/kernel/smp.c
+@@ -287,7 +287,7 @@ static void quiesce_dummy(void *unused)
+  * If a faster scheme can be made, we could go back to preferring stack based
+  * data -- the data allocation/free is non-zero cost.
+  */
+-static void smp_call_function_mask_quiesce_stack(cpumask_t mask)
++static void smp_call_function_mask_quiesce_stack(const cpumask_t *mask)
+ {
+       struct call_single_data data;
+       int cpu;
+@@ -295,7 +295,7 @@ static void smp_call_function_mask_quiesce_stack(cpumask_t mask)
+       data.func = quiesce_dummy;
+       data.info = NULL;
+ 
+-      for_each_cpu_mask(cpu, mask) {
++      for_each_cpu_mask_nr(cpu, *mask) {
+               data.flags = CSD_FLAG_WAIT;
+               generic_exec_single(cpu, &data);
+       }
+@@ -323,7 +323,6 @@ int smp_call_function_mask(cpumask_t mask, void (*func)(void *), void *info,
+ {
+       struct call_function_data d;
+       struct call_function_data *data = NULL;
+-      cpumask_t allbutself;
+       unsigned long flags;
+       int cpu, num_cpus;
+       int slowpath = 0;
+@@ -332,9 +331,8 @@ int smp_call_function_mask(cpumask_t mask, void (*func)(void *), void *info,
+       WARN_ON(irqs_disabled());
+ 
+       cpu = smp_processor_id();
+-      allbutself = cpu_online_map;
+-      cpu_clear(cpu, allbutself);
+-      cpus_and(mask, mask, allbutself);
++      cpus_and(mask, mask, cpu_online_map);
++      cpu_clear(cpu, mask);
+       num_cpus = cpus_weight(mask);
+ 
+       /*
+@@ -377,7 +375,7 @@ int smp_call_function_mask(cpumask_t mask, void (*func)(void *), void *info,
+       if (wait) {
+               csd_flag_wait(&data->csd);
+               if (unlikely(slowpath))
+-                      smp_call_function_mask_quiesce_stack(mask);
++                      smp_call_function_mask_quiesce_stack(&mask);
+       }
+ 
+       return 0;
+-- 
+1.6.0.2
+