From 063b0a4207e43acbeff3d4b09f43e750e0212b48 Mon Sep 17 00:00:00 2001 From: Russell King Date: Fri, 31 Oct 2008 15:08:35 +0000 Subject: [ARM] copypage: provide our own copy_user_highpage() We used to override the copy_user_page() function. However, this is not only inefficient, it also causes additional complexity for highmem support, since we convert from a struct page to a kernel direct mapped address and back to a struct page again. Moreover, with highmem support, we end up pointlessly setting up kmap entries for pages which we're going to remap. So, push the kmapping down into the copypage implementation files where it's required. Signed-off-by: Russell King --- arch/arm/include/asm/page.h | 23 ++++++++++++++--------- 1 file changed, 14 insertions(+), 9 deletions(-) (limited to 'arch/arm/include') diff --git a/arch/arm/include/asm/page.h b/arch/arm/include/asm/page.h index bed1c0a00368..1581b8cf8f33 100644 --- a/arch/arm/include/asm/page.h +++ b/arch/arm/include/asm/page.h @@ -108,30 +108,35 @@ #error Unknown user operations model #endif +struct page; + struct cpu_user_fns { void (*cpu_clear_user_page)(void *p, unsigned long user); - void (*cpu_copy_user_page)(void *to, const void *from, - unsigned long user); + void (*cpu_copy_user_highpage)(struct page *to, struct page *from, + unsigned long vaddr); }; #ifdef MULTI_USER extern struct cpu_user_fns cpu_user; -#define __cpu_clear_user_page cpu_user.cpu_clear_user_page -#define __cpu_copy_user_page cpu_user.cpu_copy_user_page +#define __cpu_clear_user_page cpu_user.cpu_clear_user_page +#define __cpu_copy_user_highpage cpu_user.cpu_copy_user_highpage #else -#define __cpu_clear_user_page __glue(_USER,_clear_user_page) -#define __cpu_copy_user_page __glue(_USER,_copy_user_page) +#define __cpu_clear_user_page __glue(_USER,_clear_user_page) +#define __cpu_copy_user_highpage __glue(_USER,_copy_user_highpage) extern void __cpu_clear_user_page(void *p, unsigned long user); -extern void __cpu_copy_user_page(void *to, const void *from, - unsigned long user); +extern void __cpu_copy_user_highpage(struct page *to, struct page *from, + unsigned long vaddr); #endif #define clear_user_page(addr,vaddr,pg) __cpu_clear_user_page(addr, vaddr) -#define copy_user_page(to,from,vaddr,pg) __cpu_copy_user_page(to, from, vaddr) + +#define __HAVE_ARCH_COPY_USER_HIGHPAGE +#define copy_user_highpage(to,from,vaddr,vma) \ + __cpu_copy_user_highpage(to, from, vaddr) #define clear_page(page) memzero((void *)(page), PAGE_SIZE) extern void copy_page(void *to, const void *from); -- cgit v1.2.3 From 303c6443659bc1dc911356f5de149f48ff1d97b8 Mon Sep 17 00:00:00 2001 From: Russell King Date: Fri, 31 Oct 2008 16:32:19 +0000 Subject: [ARM] clearpage: provide our own clear_user_highpage() For similar reasons as copy_user_page(), we want to avoid the additional kmap_atomic if it's unnecessary. Signed-off-by: Russell King --- arch/arm/include/asm/page.h | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) (limited to 'arch/arm/include') diff --git a/arch/arm/include/asm/page.h b/arch/arm/include/asm/page.h index 1581b8cf8f33..77747df713b4 100644 --- a/arch/arm/include/asm/page.h +++ b/arch/arm/include/asm/page.h @@ -111,7 +111,7 @@ struct page; struct cpu_user_fns { - void (*cpu_clear_user_page)(void *p, unsigned long user); + void (*cpu_clear_user_highpage)(struct page *page, unsigned long vaddr); void (*cpu_copy_user_highpage)(struct page *to, struct page *from, unsigned long vaddr); }; @@ -119,20 +119,21 @@ struct cpu_user_fns { #ifdef MULTI_USER extern struct cpu_user_fns cpu_user; -#define __cpu_clear_user_page cpu_user.cpu_clear_user_page +#define __cpu_clear_user_highpage cpu_user.cpu_clear_user_highpage #define __cpu_copy_user_highpage cpu_user.cpu_copy_user_highpage #else -#define __cpu_clear_user_page __glue(_USER,_clear_user_page) +#define __cpu_clear_user_highpage __glue(_USER,_clear_user_highpage) #define __cpu_copy_user_highpage __glue(_USER,_copy_user_highpage) -extern void __cpu_clear_user_page(void *p, unsigned long user); +extern void __cpu_clear_user_highpage(struct page *page, unsigned long vaddr); extern void __cpu_copy_user_highpage(struct page *to, struct page *from, unsigned long vaddr); #endif -#define clear_user_page(addr,vaddr,pg) __cpu_clear_user_page(addr, vaddr) +#define clear_user_highpage(page,vaddr) \ + __cpu_clear_user_highpage(page, vaddr) #define __HAVE_ARCH_COPY_USER_HIGHPAGE #define copy_user_highpage(to,from,vaddr,vma) \ -- cgit v1.2.3 From 4b5f32cee0cce7b9783ced5cbeabd17aa53c51fb Mon Sep 17 00:00:00 2001 From: Nicolas Pitre Date: Mon, 6 Oct 2008 13:24:40 -0400 Subject: [ARM] rationalize memory configuration code some more Currently there are two instances of struct meminfo: one in kernel/setup.c marked __initdata, and another in mm/init.c with permanent storage. Let's keep only the later to directly populate the permanent version from arm_add_memory(). Also move common validation tests between the MMU and non-MMU cases into arm_add_memory() to remove some duplication. Protection against overflowing the membank array is also moved in there in order to cover the kernel cmdline parsing path as well. Signed-off-by: Nicolas Pitre Signed-off-by: Russell King --- arch/arm/include/asm/setup.h | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) (limited to 'arch/arm/include') diff --git a/arch/arm/include/asm/setup.h b/arch/arm/include/asm/setup.h index a65413ba121d..f2cd18a0932b 100644 --- a/arch/arm/include/asm/setup.h +++ b/arch/arm/include/asm/setup.h @@ -209,9 +209,11 @@ struct meminfo { struct membank bank[NR_BANKS]; }; +extern struct meminfo meminfo; + #define for_each_nodebank(iter,mi,no) \ - for (iter = 0; iter < mi->nr_banks; iter++) \ - if (mi->bank[iter].node == no) + for (iter = 0; iter < (mi)->nr_banks; iter++) \ + if ((mi)->bank[iter].node == no) #define bank_pfn_start(bank) __phys_to_pfn((bank)->start) #define bank_pfn_end(bank) __phys_to_pfn((bank)->start + (bank)->size) -- cgit v1.2.3 From 75f4aa15cf05ce6d99c8261cf57dcd749877fd1c Mon Sep 17 00:00:00 2001 From: Nicolas Pitre Date: Fri, 5 Sep 2008 16:05:14 -0400 Subject: [ARM] unconditionally define __virt_to_phys and __phys_to_virt There is no machine class overriding this. If non linear translations are implemented again for some machines then this could be restored at that time. Signed-off-by: Nicolas Pitre Signed-off-by: Russell King --- arch/arm/include/asm/memory.h | 2 -- 1 file changed, 2 deletions(-) (limited to 'arch/arm/include') diff --git a/arch/arm/include/asm/memory.h b/arch/arm/include/asm/memory.h index 77764301844b..7238b3b50643 100644 --- a/arch/arm/include/asm/memory.h +++ b/arch/arm/include/asm/memory.h @@ -112,10 +112,8 @@ * private definitions which should NOT be used outside memory.h * files. Use virt_to_phys/phys_to_virt/__pa/__va instead. */ -#ifndef __virt_to_phys #define __virt_to_phys(x) ((x) - PAGE_OFFSET + PHYS_OFFSET) #define __phys_to_virt(x) ((x) - PHYS_OFFSET + PAGE_OFFSET) -#endif /* * Convert a physical address to a Page Frame Number and back -- cgit v1.2.3 From b5ee9002583fc14e6d45a04c18f208987a8fbced Mon Sep 17 00:00:00 2001 From: Nicolas Pitre Date: Fri, 5 Sep 2008 21:53:30 -0400 Subject: [ARM] remove a common set of __virt_to_bus definitions Let's provide an overridable default instead of having every machine class define __virt_to_bus and __bus_to_virt to the same thing. What most platforms are using is bus_addr == phys_addr so such is the default. One exception is ebsa110 which has no DMA what so ever, so the actual definition is not important except only for proper compilation. Also added a comment about the special footbridge bus translation. Let's also remove comments alluding to set_dma_addr which is not (and should not) be commonly used. Signed-off-by: Nicolas Pitre Signed-off-by: Russell King --- arch/arm/include/asm/memory.h | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'arch/arm/include') diff --git a/arch/arm/include/asm/memory.h b/arch/arm/include/asm/memory.h index 7238b3b50643..0202a7c20e62 100644 --- a/arch/arm/include/asm/memory.h +++ b/arch/arm/include/asm/memory.h @@ -178,6 +178,11 @@ static inline void *phys_to_virt(unsigned long x) * memory. Use of these is *deprecated* (and that doesn't mean * use the __ prefixed forms instead.) See dma-mapping.h. */ +#ifndef __virt_to_bus +#define __virt_to_bus __virt_to_phys +#define __bus_to_virt __phys_to_virt +#endif + static inline __deprecated unsigned long virt_to_bus(void *x) { return __virt_to_bus((unsigned long)x); -- cgit v1.2.3