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authorAndrew Morton <akpm@osdl.org>2006-03-23 03:01:05 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-03-23 07:38:17 -0800
commit394e3902c55e667945f6f1c2bdbc59842cce70f7 (patch)
treef4bca0bdc0c291fda6f6949265aacec0669b9084 /arch/sparc64
parent63872f87a151413100678f110d1556026002809e (diff)
downloadlinux-394e3902c55e667945f6f1c2bdbc59842cce70f7.tar.bz2
[PATCH] more for_each_cpu() conversions
When we stop allocating percpu memory for not-possible CPUs we must not touch the percpu data for not-possible CPUs at all. The correct way of doing this is to test cpu_possible() or to use for_each_cpu(). This patch is a kernel-wide sweep of all instances of NR_CPUS. I found very few instances of this bug, if any. But the patch converts lots of open-coded test to use the preferred helper macros. Cc: Mikael Starvik <starvik@axis.com> Cc: David Howells <dhowells@redhat.com> Acked-by: Kyle McMartin <kyle@parisc-linux.org> Cc: Anton Blanchard <anton@samba.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Paul Mundt <lethal@linux-sh.org> Cc: "David S. Miller" <davem@davemloft.net> Cc: William Lee Irwin III <wli@holomorphy.com> Cc: Andi Kleen <ak@muc.de> Cc: Christian Zankel <chris@zankel.net> Cc: Philippe Elie <phil.el@wanadoo.fr> Cc: Nathan Scott <nathans@sgi.com> Cc: Jens Axboe <axboe@suse.de> Cc: Eric Dumazet <dada1@cosmosbay.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/sparc64')
-rw-r--r--arch/sparc64/kernel/irq.c4
-rw-r--r--arch/sparc64/kernel/smp.c30
2 files changed, 13 insertions, 21 deletions
diff --git a/arch/sparc64/kernel/irq.c b/arch/sparc64/kernel/irq.c
index 8c93ba655b33..e505a4125e35 100644
--- a/arch/sparc64/kernel/irq.c
+++ b/arch/sparc64/kernel/irq.c
@@ -117,9 +117,7 @@ int show_interrupts(struct seq_file *p, void *v)
#ifndef CONFIG_SMP
seq_printf(p, "%10u ", kstat_irqs(i));
#else
- for (j = 0; j < NR_CPUS; j++) {
- if (!cpu_online(j))
- continue;
+ for_each_online_cpu(j) {
seq_printf(p, "%10u ",
kstat_cpu(j).irqs[i]);
}
diff --git a/arch/sparc64/kernel/smp.c b/arch/sparc64/kernel/smp.c
index 373a701c90a5..1b6e2ade1008 100644
--- a/arch/sparc64/kernel/smp.c
+++ b/arch/sparc64/kernel/smp.c
@@ -57,25 +57,21 @@ void smp_info(struct seq_file *m)
int i;
seq_printf(m, "State:\n");
- for (i = 0; i < NR_CPUS; i++) {
- if (cpu_online(i))
- seq_printf(m,
- "CPU%d:\t\tonline\n", i);
- }
+ for_each_online_cpu(i)
+ seq_printf(m, "CPU%d:\t\tonline\n", i);
}
void smp_bogo(struct seq_file *m)
{
int i;
- for (i = 0; i < NR_CPUS; i++)
- if (cpu_online(i))
- seq_printf(m,
- "Cpu%dBogo\t: %lu.%02lu\n"
- "Cpu%dClkTck\t: %016lx\n",
- i, cpu_data(i).udelay_val / (500000/HZ),
- (cpu_data(i).udelay_val / (5000/HZ)) % 100,
- i, cpu_data(i).clock_tick);
+ for_each_online_cpu(i)
+ seq_printf(m,
+ "Cpu%dBogo\t: %lu.%02lu\n"
+ "Cpu%dClkTck\t: %016lx\n",
+ i, cpu_data(i).udelay_val / (500000/HZ),
+ (cpu_data(i).udelay_val / (5000/HZ)) % 100,
+ i, cpu_data(i).clock_tick);
}
void __init smp_store_cpu_info(int id)
@@ -1282,7 +1278,7 @@ int setup_profiling_timer(unsigned int multiplier)
return -EINVAL;
spin_lock_irqsave(&prof_setup_lock, flags);
- for (i = 0; i < NR_CPUS; i++)
+ for_each_cpu(i)
prof_multiplier(i) = multiplier;
current_tick_offset = (timer_tick_offset / multiplier);
spin_unlock_irqrestore(&prof_setup_lock, flags);
@@ -1384,10 +1380,8 @@ void __init smp_cpus_done(unsigned int max_cpus)
unsigned long bogosum = 0;
int i;
- for (i = 0; i < NR_CPUS; i++) {
- if (cpu_online(i))
- bogosum += cpu_data(i).udelay_val;
- }
+ for_each_online_cpu(i)
+ bogosum += cpu_data(i).udelay_val;
printk("Total of %ld processors activated "
"(%lu.%02lu BogoMIPS).\n",
(long) num_online_cpus(),