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authorScott Wood <scottwood@freescale.com>2015-04-16 03:40:23 +0300
committerScott Wood <scottwood@freescale.com>2015-08-08 06:59:20 +0300
commit2f7d2b74a9dd9140053f143e1c94da0fef3c1109 (patch)
treecc90ce077e6bfa19440953c1914b78e690182403 /arch/powerpc/mm/mem.c
parent501c8de7b061d2dc0c21a0a79fee3eddf30af8dd (diff)
downloadlinux-2f7d2b74a9dd9140053f143e1c94da0fef3c1109.tar.xz
powerpc/mm: Don't call __flush_dcache_icache_phys() with PA>VA
__flush_dcache_icache_phys() requires the ability to access the memory with the MMU disabled, which means that on a 32-bit system any memory above 4 GiB is inaccessible. In particular, mpc86xx is 32-bit and can have more than 4 GiB of RAM. Signed-off-by: Scott Wood <scottwood@freescale.com>
Diffstat (limited to 'arch/powerpc/mm/mem.c')
-rw-r--r--arch/powerpc/mm/mem.c14
1 files changed, 7 insertions, 7 deletions
diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
index 0f11819d8f1d..e1fe333da946 100644
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c
@@ -414,17 +414,17 @@ void flush_dcache_icache_page(struct page *page)
return;
}
#endif
-#ifdef CONFIG_BOOKE
- {
+#if defined(CONFIG_8xx) || defined(CONFIG_PPC64)
+ /* On 8xx there is no need to kmap since highmem is not supported */
+ __flush_dcache_icache(page_address(page));
+#else
+ if (IS_ENABLED(CONFIG_BOOKE) || sizeof(phys_addr_t) > sizeof(void *)) {
void *start = kmap_atomic(page);
__flush_dcache_icache(start);
kunmap_atomic(start);
+ } else {
+ __flush_dcache_icache_phys(page_to_pfn(page) << PAGE_SHIFT);
}
-#elif defined(CONFIG_8xx) || defined(CONFIG_PPC64)
- /* On 8xx there is no need to kmap since highmem is not supported */
- __flush_dcache_icache(page_address(page));
-#else
- __flush_dcache_icache_phys(page_to_pfn(page) << PAGE_SHIFT);
#endif
}
EXPORT_SYMBOL(flush_dcache_icache_page);