Revision 528ba4ef855bd184b7d68e3fa596b420fb4fa86a authored by Linus Torvalds on 31 October 2006, 03:31:20 UTC, committed by Linus Torvalds on 31 October 2006, 03:31:20 UTC
* 'upstream' of git://ftp.linux-mips.org/pub/scm/upstream-linus: [MIPS] MIPS doesn't need compat_sys_getdents. [MIPS] JMR3927: Fixup another victim of the irq pt_regs cleanup. [MIPS] EMMA 2 / Markeins: struct resource takes physical addresses. [MIPS] EMMA 2 / Markeins: Convert to name struct resource initialization. [MIPS] EMMA 2 / Markeins: Formitting fixes split from actual address fixes. [MIPS] EMMA 2 / Markeins: Fix build wreckage due to genirq wreckage. [MIPS] Ocelot G: Fix build error and numerous warnings. [MIPS] Fix return value of TXX9 SPI interrupt handler [MIPS] Au1000: Fix warning about unused variable. [MIPS] Wire up getcpu(2) and epoll_wait(2) syscalls. [MIPS] Make SB1 cache flushes not to use on_each_cpu [MIPS] Fix warning about unused definition in c-sb1.c [MIPS] SMTC: Make 8 the default number of processors. [MIPS] Oprofile: Fix MIPSxx counter number detection. [MIPS] Au1xx0 code sets incorrect mips_hpt_frequency [MIPS] Oprofile: fix on non-VSMP / non-SMTC SMP configurations.
percpu_counter.c
/*
* Fast batching percpu counters.
*/
#include <linux/percpu_counter.h>
#include <linux/module.h>
void percpu_counter_mod(struct percpu_counter *fbc, s32 amount)
{
long count;
s32 *pcount;
int cpu = get_cpu();
pcount = per_cpu_ptr(fbc->counters, cpu);
count = *pcount + amount;
if (count >= FBC_BATCH || count <= -FBC_BATCH) {
spin_lock(&fbc->lock);
fbc->count += count;
*pcount = 0;
spin_unlock(&fbc->lock);
} else {
*pcount = count;
}
put_cpu();
}
EXPORT_SYMBOL(percpu_counter_mod);
/*
* Add up all the per-cpu counts, return the result. This is a more accurate
* but much slower version of percpu_counter_read_positive()
*/
s64 percpu_counter_sum(struct percpu_counter *fbc)
{
s64 ret;
int cpu;
spin_lock(&fbc->lock);
ret = fbc->count;
for_each_possible_cpu(cpu) {
s32 *pcount = per_cpu_ptr(fbc->counters, cpu);
ret += *pcount;
}
spin_unlock(&fbc->lock);
return ret < 0 ? 0 : ret;
}
EXPORT_SYMBOL(percpu_counter_sum);
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