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x86: fix clflush_page_range logic 

only present ptes must be flushed.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ingo Molnar 2008-01-30 13:34:09 +01:00
parent 3b233e52f7
commit 4c61afcdb2
2 changed files with 25 additions and 8 deletions
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31
arch/x86/mm/pageattr.c
View File

@ -26,7 +26,6 @@ within(unsigned long addr, unsigned long start, unsigned long end)
* Flushing functions
*/
/**
* clflush_cache_range - flush a cache range with clflush
* @addr: virtual start address
@ -35,13 +34,19 @@ within(unsigned long addr, unsigned long start, unsigned long end)
* clflush is an unordered instruction which needs fencing with mfence
* to avoid ordering issues.
*/
void clflush_cache_range(void *addr, int size)
void clflush_cache_range(void *vaddr, unsigned int size)
{
int i;
void *vend = vaddr + size - 1;
mb();
for (i = 0; i < size; i += boot_cpu_data.x86_clflush_size)
clflush(addr+i);
for (; vaddr < vend; vaddr += boot_cpu_data.x86_clflush_size)
clflush(vaddr);
/*
* Flush any possible final partial cacheline:
*/
clflush(vend);
mb();
}
@ -74,9 +79,13 @@ static void __cpa_flush_range(void *arg)
__flush_tlb_all();
}
static void cpa_flush_range(unsigned long addr, int numpages)
static void cpa_flush_range(unsigned long start, int numpages)
{
unsigned int i, level;
unsigned long addr;
BUG_ON(irqs_disabled());
WARN_ON(PAGE_ALIGN(start) != start);
on_each_cpu(__cpa_flush_range, NULL, 1, 1);
@ -86,7 +95,15 @@ static void cpa_flush_range(unsigned long addr, int numpages)
* will cause all other CPUs to flush the same
* cachelines:
*/
clflush_cache_range((void *) addr, numpages * PAGE_SIZE);
for (i = 0, addr = start; i < numpages; i++, addr += PAGE_SIZE) {
pte_t *pte = lookup_address(addr, &level);
/*
* Only flush present addresses:
*/
if (pte && pte_present(*pte))
clflush_cache_range((void *) addr, PAGE_SIZE);
}
}
/*

2
include/asm-x86/cacheflush.h
View File

@ -42,7 +42,7 @@ int set_memory_ro(unsigned long addr, int numpages);
int set_memory_rw(unsigned long addr, int numpages);
int set_memory_np(unsigned long addr, int numpages);
void clflush_cache_range(void *addr, int size);
void clflush_cache_range(void *addr, unsigned int size);
#ifdef CONFIG_DEBUG_RODATA
void mark_rodata_ro(void);