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x86: avoid back to back on_each_cpu in cpa_flush_array

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Cleanup cpa_flush_array() to avoid back to back on_each_cpu() calls.

[ Impact: optimizes fix 0af48f42df15b97080b450d24219dd95db7b929a ]

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
Pallipadi, Venkatesh 2009-05-26 10:33:35 -07:00 committed by H. Peter Anvin
parent 46176b4f6b
commit 2171787be2
1 changed files with 3 additions and 14 deletions
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17
arch/x86/mm/pageattr.c
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@ -204,30 +204,19 @@ static void cpa_flush_range(unsigned long start, int numpages, int cache)
}
}
static void wbinvd_local(void *unused)
{
wbinvd();
}
static void cpa_flush_array(unsigned long *start, int numpages, int cache,
int in_flags, struct page **pages)
{
unsigned int i, level;
unsigned long do_wbinvd = cache && numpages >= 1024; /* 4M threshold */
BUG_ON(irqs_disabled());
on_each_cpu(__cpa_flush_range, NULL, 1);
on_each_cpu(__cpa_flush_all, (void *) do_wbinvd, 1);
if (!cache)
if (!cache || do_wbinvd)
return;
/* 4M threshold */
if (numpages >= 1024) {
if (boot_cpu_data.x86 >= 4)
on_each_cpu(wbinvd_local, NULL, 1);
return;
}
/*
* We only need to flush on one CPU,
* clflush is a MESI-coherent instruction that