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[ARM] 5092/1: Fix the I-cache invalidation on ARMv6 and later CPUs 

This patch adds the I-cache invalidation in update_mmu_cache if the
corresponding vma is marked as executable. It also invalidates the
I-cache if a thread migrates to a CPU it never ran on.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Catalin Marinas 2008-06-13 10:28:36 +01:00 committed by Russell King
parent 43df5220e4
commit 826cbdaff2
4 changed files with 18 additions and 0 deletions
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4
arch/arm/mm/fault-armv.c
View File

@ -144,13 +144,17 @@ void update_mmu_cache(struct vm_area_struct *vma, unsigned long addr, pte_t pte)
page = pfn_to_page(pfn);
mapping = page_mapping(page);
if (mapping) {
#ifndef CONFIG_SMP
int dirty = test_and_clear_bit(PG_dcache_dirty, &page->flags);
if (dirty)
__flush_dcache_page(mapping, page);
#endif
if (cache_is_vivt())
make_coherent(mapping, vma, addr, pfn);
else if (vma->vm_flags & VM_EXEC)
__flush_icache_all();
}
}

2
arch/arm/mm/flush.c
View File

@ -199,6 +199,8 @@ void flush_dcache_page(struct page *page)
__flush_dcache_page(mapping, page);
if (mapping && cache_is_vivt())
__flush_dcache_aliases(mapping, page);
else if (mapping)
__flush_icache_all();
}
}
EXPORT_SYMBOL(flush_dcache_page);

7
include/asm-arm/cacheflush.h
View File

@ -410,6 +410,13 @@ extern void flush_dcache_page(struct page *);
extern void __flush_dcache_page(struct address_space *mapping, struct page *page);
static inline void __flush_icache_all(void)
{
asm("mcr p15, 0, %0, c7, c5, 0 @ invalidate I-cache\n"
:
: "r" (0));
}
#define ARCH_HAS_FLUSH_ANON_PAGE
static inline void flush_anon_page(struct vm_area_struct *vma,
struct page *page, unsigned long vmaddr)

5
include/asm-arm/mmu_context.h
View File

@ -97,6 +97,11 @@ switch_mm(struct mm_struct *prev, struct mm_struct *next,
#ifdef CONFIG_MMU
unsigned int cpu = smp_processor_id();
#ifdef CONFIG_SMP
/* check for possible thread migration */
if (!cpus_empty(next->cpu_vm_mask) && !cpu_isset(cpu, next->cpu_vm_mask))
__flush_icache_all();
#endif
if (!cpu_test_and_set(cpu, next->cpu_vm_mask) || prev != next) {
check_context(next);
cpu_switch_mm(next->pgd, next);