Index: linux-2.6.25.1/arch/mips/mm/init.c =================================================================== --- linux-2.6.25.1.orig/arch/mips/mm/init.c 2008-05-18 11:32:33.000000000 +0100 +++ linux-2.6.25.1/arch/mips/mm/init.c 2008-05-18 21:05:57.000000000 +0100 @@ -211,7 +211,7 @@ void copy_user_highpage(struct page *to, void *vfrom, *vto; vto = kmap_atomic(to, KM_USER1); - if (cpu_has_dc_aliases && + if (cpu_has_dc_aliases && cpu_use_kmap_coherent && page_mapped(from) && !Page_dcache_dirty(from)) { vfrom = kmap_coherent(from, vaddr); copy_page(vto, vfrom); @@ -235,7 +235,7 @@ void copy_to_user_page(struct vm_area_st struct page *page, unsigned long vaddr, void *dst, const void *src, unsigned long len) { - if (cpu_has_dc_aliases && + if (cpu_has_dc_aliases && cpu_use_kmap_coherent && page_mapped(page) && !Page_dcache_dirty(page)) { void *vto = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK); memcpy(vto, src, len); @@ -255,7 +255,7 @@ void copy_from_user_page(struct vm_area_ struct page *page, unsigned long vaddr, void *dst, const void *src, unsigned long len) { - if (cpu_has_dc_aliases && + if (cpu_has_dc_aliases && cpu_use_kmap_coherent && page_mapped(page) && !Page_dcache_dirty(page)) { void *vfrom = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK); memcpy(dst, vfrom, len); Index: linux-2.6.25.1/include/asm-mips/mach-bcm47xx/cpu-feature-overrides.h =================================================================== --- /dev/null 1970-01-01 00:00:00.000000000 +0000 +++ linux-2.6.25.1/include/asm-mips/mach-bcm47xx/cpu-feature-overrides.h 2008-05-18 11:32:40.000000000 +0100 @@ -0,0 +1,13 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (C) 2005 Ralf Baechle (ralf@linux-mips.org) + */ +#ifndef __ASM_MACH_BCM47XX_CPU_FEATURE_OVERRIDES_H +#define __ASM_MACH_BCM47XX_CPU_FEATURE_OVERRIDES_H + +#define cpu_use_kmap_coherent 0 + +#endif /* __ASM_MACH_BCM47XX_CPU_FEATURE_OVERRIDES_H */ Index: linux-2.6.25.1/include/asm-mips/cpu-features.h =================================================================== --- linux-2.6.25.1.orig/include/asm-mips/cpu-features.h 2008-05-18 11:32:33.000000000 +0100 +++ linux-2.6.25.1/include/asm-mips/cpu-features.h 2008-05-18 11:32:40.000000000 +0100 @@ -101,6 +101,9 @@ #ifndef cpu_has_pindexed_dcache #define cpu_has_pindexed_dcache (cpu_data[0].dcache.flags & MIPS_CACHE_PINDEX) #endif +#ifndef cpu_use_kmap_coherent +#define cpu_use_kmap_coherent 1 +#endif /* * I-Cache snoops remote store. This only matters on SMP. Some multiprocessors Index: linux-2.6.25.1/arch/mips/mm/c-r4k.c =================================================================== --- linux-2.6.25.1.orig/arch/mips/mm/c-r4k.c 2008-05-18 21:06:36.000000000 +0100 +++ linux-2.6.25.1/arch/mips/mm/c-r4k.c 2008-05-18 21:09:28.000000000 +0100 @@ -484,7 +484,7 @@ static inline void local_r4k_flush_cache * Use kmap_coherent or kmap_atomic to do flushes for * another ASID than the current one. */ - if (cpu_has_dc_aliases) + if (cpu_has_dc_aliases && cpu_use_kmap_coherent) vaddr = kmap_coherent(page, addr); else vaddr = kmap_atomic(page, KM_USER0); @@ -505,7 +505,7 @@ static inline void local_r4k_flush_cache } if (vaddr) { - if (cpu_has_dc_aliases) + if (cpu_has_dc_aliases && cpu_use_kmap_coherent) kunmap_coherent(); else kunmap_atomic(vaddr, KM_USER0);