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[PATCH] more for_each_cpu() conversions

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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>
This commit is contained in:
Andrew Morton
2006-03-23 03:01:05 -08:00
committed by Linus Torvalds
parent 63872f87a1
commit 394e3902c5
42 changed files with 137 additions and 222 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
arch/sparc/kernel/irq.c
View File

@ -184,9 +184,8 @@ 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))
seq_printf(p, "%10u ",
for_each_online_cpu(j) {
seq_printf(p, "%10u ",
kstat_cpu(cpu_logical_map(j)).irqs[i]);
}
#endif

24
arch/sparc/kernel/smp.c
View File

@ -243,9 +243,8 @@ int setup_profiling_timer(unsigned int multiplier)
return -EINVAL;
spin_lock_irqsave(&prof_setup_lock, flags);
for(i = 0; i < NR_CPUS; i++) {
if (cpu_possible(i))
load_profile_irq(i, lvl14_resolution / multiplier);
for_each_cpu(i) {
load_profile_irq(i, lvl14_resolution / multiplier);
prof_multiplier(i) = multiplier;
}
spin_unlock_irqrestore(&prof_setup_lock, flags);
@ -273,13 +272,12 @@ 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",
i,
cpu_data(i).udelay_val/(500000/HZ),
(cpu_data(i).udelay_val/(5000/HZ))%100);
for_each_online_cpu(i) {
seq_printf(m,
"Cpu%dBogo\t: %lu.%02lu\n",
i,
cpu_data(i).udelay_val/(500000/HZ),
(cpu_data(i).udelay_val/(5000/HZ))%100);
}
}
@ -288,8 +286,6 @@ 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\t: online\n", i);
}
for_each_online_cpu(i)
seq_printf(m, "CPU%d\t\t: online\n", i);
}

8
arch/sparc/kernel/sun4d_irq.c
View File

@ -103,11 +103,9 @@ found_it: seq_printf(p, "%3d: ", i);
#ifndef CONFIG_SMP
seq_printf(p, "%10u ", kstat_irqs(i));
#else
for (x = 0; x < NR_CPUS; x++) {
if (cpu_online(x))
seq_printf(p, "%10u ",
kstat_cpu(cpu_logical_map(x)).irqs[i]);
}
for_each_online_cpu(x)
seq_printf(p, "%10u ",
kstat_cpu(cpu_logical_map(x)).irqs[i]);
#endif
seq_printf(p, "%c %s",
(action->flags & SA_INTERRUPT) ? '+' : ' ',

8
arch/sparc/kernel/sun4d_smp.c
View File

@ -249,11 +249,9 @@ void __init smp4d_boot_cpus(void)
} else {
unsigned long bogosum = 0;
for(i = 0; i < NR_CPUS; i++) {
if (cpu_isset(i, cpu_present_map)) {
bogosum += cpu_data(i).udelay_val;
smp_highest_cpu = i;
}
for_each_present_cpu(i) {
bogosum += cpu_data(i).udelay_val;
smp_highest_cpu = i;
}
SMP_PRINTK(("Total of %d Processors activated (%lu.%02lu BogoMIPS).\n", cpucount + 1, bogosum/(500000/HZ), (bogosum/(5000/HZ))%100));
printk("Total of %d Processors activated (%lu.%02lu BogoMIPS).\n",

6
arch/sparc/kernel/sun4m_smp.c
View File

@ -218,10 +218,8 @@ void __init smp4m_boot_cpus(void)
cpu_present_map = cpumask_of_cpu(smp_processor_id());
} else {
unsigned long bogosum = 0;
for(i = 0; i < NR_CPUS; i++) {
if (cpu_isset(i, cpu_present_map))
bogosum += cpu_data(i).udelay_val;
}
for_each_present_cpu(i)
bogosum += cpu_data(i).udelay_val;
printk("Total of %d Processors activated (%lu.%02lu BogoMIPS).\n",
cpucount + 1,
bogosum/(500000/HZ),