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ARM: mm: Add support for flushing HugeTLB pages.

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On ARM we use the __flush_dcache_page function to flush the dcache
of pages when needed; usually when the PG_dcache_clean bit is unset
and we are setting a PTE.

A HugeTLB page is represented as a compound page consisting of an
array of pages. Thus to flush the dcache of a HugeTLB page, one must
flush more than a single page.

This patch modifies __flush_dcache_page such that all constituent
pages of a HugeTLB page are flushed.

Signed-off-by: Steve Capper <steve.capper@linaro.org>
Reviewed-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Steve Capper 2013-05-17 12:33:28 +01:00
parent dde1b65110
commit 0b19f93351
1 changed files with 15 additions and 10 deletions
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25
arch/arm/mm/flush.c
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@ -17,6 +17,7 @@
#include <asm/highmem.h>
#include <asm/smp_plat.h>
#include <asm/tlbflush.h>
#include <linux/hugetlb.h>
#include "mm.h"
@ -168,19 +169,23 @@ void __flush_dcache_page(struct address_space *mapping, struct page *page)
* coherent with the kernels mapping.
*/
if (!PageHighMem(page)) {
__cpuc_flush_dcache_area(page_address(page), PAGE_SIZE);
size_t page_size = PAGE_SIZE << compound_order(page);
__cpuc_flush_dcache_area(page_address(page), page_size);
} else {
void *addr;
unsigned long i;
if (cache_is_vipt_nonaliasing()) {
addr = kmap_atomic(page);
__cpuc_flush_dcache_area(addr, PAGE_SIZE);
kunmap_atomic(addr);
} else {
addr = kmap_high_get(page);
if (addr) {
for (i = 0; i < (1 << compound_order(page)); i++) {
void *addr = kmap_atomic(page);
__cpuc_flush_dcache_area(addr, PAGE_SIZE);
kunmap_high(page);
kunmap_atomic(addr);
}
} else {
for (i = 0; i < (1 << compound_order(page)); i++) {
void *addr = kmap_high_get(page);
if (addr) {
__cpuc_flush_dcache_area(addr, PAGE_SIZE);
kunmap_high(page);
}
}
}
}