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[PATCH] percpu data: only iterate over possible CPUs 

percpu_data blindly allocates bootmem memory to store NR_CPUS instances of
cpudata, instead of allocating memory only for possible cpus.

As a preparation for changing that, we need to convert various 0 -> NR_CPUS
loops to use for_each_cpu().

(The above only applies to users of asm-generic/percpu.h.  powerpc has gone it
alone and is presently only allocating memory for present CPUs, so it's
currently corrupting memory).

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: James Bottomley <James.Bottomley@steeleye.com>
Acked-by: Ingo Molnar <mingo@elte.hu>
Cc: Jens Axboe <axboe@suse.de>
Cc: Anton Blanchard <anton@samba.org>
Acked-by: William Irwin <wli@holomorphy.com>
Cc: Andi Kleen <ak@muc.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Eric Dumazet 2006-02-04 23:27:36 -08:00 committed by Linus Torvalds
parent cef5076987
commit 88a2a4ac6b
11 changed files with 17 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/i386/kernel/nmi.c
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@ -138,7 +138,7 @@ static int __init check_nmi_watchdog(void)
if (nmi_watchdog == NMI_LOCAL_APIC)
smp_call_function(nmi_cpu_busy, (void *)&endflag, 0, 0);
for (cpu = 0; cpu < NR_CPUS; cpu++)
for_each_cpu(cpu)
prev_nmi_count[cpu] = per_cpu(irq_stat, cpu).__nmi_count;
local_irq_enable();
mdelay((10*1000)/nmi_hz); // wait 10 ticks

2
block/ll_rw_blk.c
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@ -3453,7 +3453,7 @@ int __init blk_dev_init(void)
iocontext_cachep = kmem_cache_create("blkdev_ioc",
sizeof(struct io_context), 0, SLAB_PANIC, NULL, NULL);
for (i = 0; i < NR_CPUS; i++)
for_each_cpu(i)
INIT_LIST_HEAD(&per_cpu(blk_cpu_done, i));
open_softirq(BLOCK_SOFTIRQ, blk_done_softirq, NULL);

2
drivers/scsi/scsi.c
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@ -1245,7 +1245,7 @@ static int __init init_scsi(void)
if (error)
goto cleanup_sysctl;
for (i = 0; i < NR_CPUS; i++)
for_each_cpu(i)
INIT_LIST_HEAD(&per_cpu(scsi_done_q, i));
devfs_mk_dir("scsi");

3
fs/file.c
View File

@ -379,7 +379,6 @@ static void __devinit fdtable_defer_list_init(int cpu)
void __init files_defer_init(void)
{
int i;
/* Really early - can't use for_each_cpu */
for (i = 0; i < NR_CPUS; i++)
for_each_cpu(i)
fdtable_defer_list_init(i);
}

2
kernel/sched.c
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@ -6109,7 +6109,7 @@ void __init sched_init(void)
runqueue_t *rq;
int i, j, k;
for (i = 0; i < NR_CPUS; i++) {
for_each_cpu(i) {
prio_array_t *array;
rq = cpu_rq(i);

10
mm/page_alloc.c
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@ -1213,18 +1213,21 @@ static void __get_page_state(struct page_state *ret, int nr, cpumask_t *cpumask)
{
int cpu = 0;
memset(ret, 0, sizeof(*ret));
memset(ret, 0, nr * sizeof(unsigned long));
cpus_and(*cpumask, *cpumask, cpu_online_map);
cpu = first_cpu(*cpumask);
while (cpu < NR_CPUS) {
unsigned long *in, *out, off;
if (!cpu_isset(cpu, *cpumask))
continue;
in = (unsigned long *)&per_cpu(page_states, cpu);
cpu = next_cpu(cpu, *cpumask);
if (cpu < NR_CPUS)
if (likely(cpu < NR_CPUS))
prefetch(&per_cpu(page_states, cpu));
out = (unsigned long *)ret;
@ -1886,8 +1889,7 @@ static void setup_pagelist_highmark(struct per_cpu_pageset *p,
* not check if the processor is online before following the pageset pointer.
* Other parts of the kernel may not check if the zone is available.
*/
static struct per_cpu_pageset
boot_pageset[NR_CPUS];
static struct per_cpu_pageset boot_pageset[NR_CPUS];
/*
* Dynamically allocate memory for the

2
net/core/dev.c
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@ -3237,7 +3237,7 @@ static int __init net_dev_init(void)
* Initialise the packet receive queues.
*/
for (i = 0; i < NR_CPUS; i++) {
for_each_cpu(i) {
struct softnet_data *queue;
queue = &per_cpu(softnet_data, i);

4
net/core/utils.c
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@ -121,7 +121,7 @@ void __init net_random_init(void)
{
int i;
for (i = 0; i < NR_CPUS; i++) {
for_each_cpu(i) {
struct nrnd_state *state = &per_cpu(net_rand_state,i);
__net_srandom(state, i+jiffies);
}
@ -133,7 +133,7 @@ static int net_random_reseed(void)
unsigned long seed[NR_CPUS];
get_random_bytes(seed, sizeof(seed));
for (i = 0; i < NR_CPUS; i++) {
for_each_cpu(i) {
struct nrnd_state *state = &per_cpu(net_rand_state,i);
__net_srandom(state, seed[i]);
}

2
net/ipv4/proc.c
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@ -49,7 +49,7 @@ static int fold_prot_inuse(struct proto *proto)
int res = 0;
int cpu;
for (cpu = 0; cpu < NR_CPUS; cpu++)
for_each_cpu(cpu)
res += proto->stats[cpu].inuse;
return res;

2
net/ipv6/proc.c
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@ -38,7 +38,7 @@ static int fold_prot_inuse(struct proto *proto)
int res = 0;
int cpu;
for (cpu=0; cpu<NR_CPUS; cpu++)
for_each_cpu(cpu)
res += proto->stats[cpu].inuse;
return res;

2
net/socket.c
View File

@ -2078,7 +2078,7 @@ void socket_seq_show(struct seq_file *seq)
int cpu;
int counter = 0;
for (cpu = 0; cpu < NR_CPUS; cpu++)
for_each_cpu(cpu)
counter += per_cpu(sockets_in_use, cpu);
/* It can be negative, by the way. 8) */