Commit c0fe478d authored by Paul Mundt's avatar Paul Mundt
Browse files

sh: Provide __flush_anon_page(). 



This provides a __flush_anon_page() that handles both the aliasing and
non-aliasing cases. This fixes up some crashes with heavy
get_user_pages() users.

Signed-off-by: default avatarPaul Mundt <lethal@linux-sh.org>
parent b5eb10ae

arch/sh/include/asm/cacheflush.h

+14 −0
Original line number Diff line number Diff line 
#ifndef __ASM_SH_CACHEFLUSH_H

#define __ASM_SH_CACHEFLUSH_H



#include <linux/mm.h>



#ifdef __KERNEL__



#ifdef CONFIG_CACHE_OFF
@@ -43,6 +45,18 @@ extern void __flush_purge_region(void *start, int size); 
extern void __flush_invalidate_region(void *start, int size);

#endif



#ifdef CONFIG_MMU

#define ARCH_HAS_FLUSH_ANON_PAGE

extern void __flush_anon_page(struct page *page, unsigned long);



static inline void flush_anon_page(struct vm_area_struct *vma,

				   struct page *page, unsigned long vmaddr)

{

	if (boot_cpu_data.dcache.n_aliases && PageAnon(page))

		__flush_anon_page(page, vmaddr);

}

#endif



#define ARCH_HAS_FLUSH_KERNEL_DCACHE_PAGE

static inline void flush_kernel_dcache_page(struct page *page)

{

arch/sh/mm/pg-mmu.c

+17 −0
Original line number Diff line number Diff line
@@ -157,3 +157,20 @@ void __update_cache(struct vm_area_struct *vma, 
		}

	}

}



void __flush_anon_page(struct page *page, unsigned long vmaddr)

{

	unsigned long addr = (unsigned long) page_address(page);



	if (pages_do_alias(addr, vmaddr)) {

		if (boot_cpu_data.dcache.n_aliases && page_mapped(page) &&

		    !test_bit(PG_dcache_dirty, &page->flags)) {

			void *kaddr;



			kaddr = kmap_coherent(page, vmaddr);

			__flush_wback_region((void *)kaddr, PAGE_SIZE);

			kunmap_coherent();

		} else

			__flush_wback_region((void *)addr, PAGE_SIZE);

	}

}