From: Ira Weiny <ira.weiny@xxxxxxxxx> Subject: arch/kmap_atomic: consolidate duplicate code Every arch has the same code to ensure atomic operations and a check for !HIGHMEM page. Remove the duplicate code by defining a core kmap_atomic() which only calls the arch specific kmap_atomic_high() when the page is high memory. [akpm@xxxxxxxxxxxxxxxxxxxx: coding style fixes] Link: http://lkml.kernel.org/r/20200507150004.1423069-7-ira.weiny@xxxxxxxxx Signed-off-by: Ira Weiny <ira.weiny@xxxxxxxxx> Reviewed-by: Christoph Hellwig <hch@xxxxxx> Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx> Cc: Andy Lutomirski <luto@xxxxxxxxxx> Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx> Cc: Borislav Petkov <bp@xxxxxxxxx> Cc: Christian König <christian.koenig@xxxxxxx> Cc: Chris Zankel <chris@xxxxxxxxxx> Cc: Daniel Vetter <daniel.vetter@xxxxxxxx> Cc: Dan Williams <dan.j.williams@xxxxxxxxx> Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx> Cc: "David S. Miller" <davem@xxxxxxxxxxxxx> Cc: Helge Deller <deller@xxxxxx> Cc: "H. Peter Anvin" <hpa@xxxxxxxxx> Cc: Ingo Molnar <mingo@xxxxxxxxxx> Cc: "James E.J. Bottomley" <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx> Cc: Max Filippov <jcmvbkbc@xxxxxxxxx> Cc: Paul Mackerras <paulus@xxxxxxxxx> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx> Cc: Thomas Bogendoerfer <tsbogend@xxxxxxxxxxxxxxxx> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- arch/arc/include/asm/highmem.h | 1 - arch/arc/mm/highmem.c | 9 ++------- arch/arm/include/asm/highmem.h | 1 - arch/arm/mm/highmem.c | 9 ++------- arch/csky/include/asm/highmem.h | 1 - arch/csky/mm/highmem.c | 9 ++------- arch/microblaze/include/asm/highmem.h | 4 ++-- arch/mips/include/asm/highmem.h | 1 - arch/mips/mm/cache.c | 2 +- arch/mips/mm/highmem.c | 18 ++---------------- arch/nds32/include/asm/highmem.h | 1 - arch/nds32/mm/highmem.c | 11 ++--------- arch/powerpc/include/asm/highmem.h | 4 ++-- arch/powerpc/mm/highmem.c | 6 ------ arch/sparc/include/asm/highmem.h | 1 - arch/sparc/mm/highmem.c | 9 ++------- arch/x86/include/asm/highmem.h | 5 ++++- arch/x86/mm/highmem_32.c | 14 -------------- arch/xtensa/include/asm/highmem.h | 1 - arch/xtensa/mm/highmem.c | 9 ++------- include/linux/highmem.h | 23 +++++++++++++++++++++++ 21 files changed, 46 insertions(+), 93 deletions(-) --- a/arch/arc/include/asm/highmem.h~arch-kmap_atomic-consolidate-duplicate-code +++ a/arch/arc/include/asm/highmem.h @@ -30,7 +30,6 @@ #include <asm/cacheflush.h> -extern void *kmap_atomic(struct page *page); extern void __kunmap_atomic(void *kvaddr); extern void kmap_init(void); --- a/arch/arc/mm/highmem.c~arch-kmap_atomic-consolidate-duplicate-code +++ a/arch/arc/mm/highmem.c @@ -49,16 +49,11 @@ extern pte_t * pkmap_page_table; static pte_t * fixmap_page_table; -void *kmap_atomic(struct page *page) +void *kmap_atomic_high(struct page *page) { int idx, cpu_idx; unsigned long vaddr; - preempt_disable(); - pagefault_disable(); - if (!PageHighMem(page)) - return page_address(page); - cpu_idx = kmap_atomic_idx_push(); idx = cpu_idx + KM_TYPE_NR * smp_processor_id(); vaddr = FIXMAP_ADDR(idx); @@ -68,7 +63,7 @@ void *kmap_atomic(struct page *page) return (void *)vaddr; } -EXPORT_SYMBOL(kmap_atomic); +EXPORT_SYMBOL(kmap_atomic_high); void __kunmap_atomic(void *kv) { --- a/arch/arm/include/asm/highmem.h~arch-kmap_atomic-consolidate-duplicate-code +++ a/arch/arm/include/asm/highmem.h @@ -60,7 +60,6 @@ static inline void *kmap_high_get(struct * when CONFIG_HIGHMEM is not set. */ #ifdef CONFIG_HIGHMEM -extern void *kmap_atomic(struct page *page); extern void __kunmap_atomic(void *kvaddr); extern void *kmap_atomic_pfn(unsigned long pfn); #endif --- a/arch/arm/mm/highmem.c~arch-kmap_atomic-consolidate-duplicate-code +++ a/arch/arm/mm/highmem.c @@ -31,18 +31,13 @@ static inline pte_t get_fixmap_pte(unsig return *ptep; } -void *kmap_atomic(struct page *page) +void *kmap_atomic_high(struct page *page) { unsigned int idx; unsigned long vaddr; void *kmap; int type; - preempt_disable(); - pagefault_disable(); - if (!PageHighMem(page)) - return page_address(page); - #ifdef CONFIG_DEBUG_HIGHMEM /* * There is no cache coherency issue when non VIVT, so force the @@ -76,7 +71,7 @@ void *kmap_atomic(struct page *page) return (void *)vaddr; } -EXPORT_SYMBOL(kmap_atomic); +EXPORT_SYMBOL(kmap_atomic_high); void __kunmap_atomic(void *kvaddr) { --- a/arch/csky/include/asm/highmem.h~arch-kmap_atomic-consolidate-duplicate-code +++ a/arch/csky/include/asm/highmem.h @@ -32,7 +32,6 @@ extern pte_t *pkmap_page_table; #define ARCH_HAS_KMAP_FLUSH_TLB extern void kmap_flush_tlb(unsigned long addr); -extern void *kmap_atomic(struct page *page); extern void __kunmap_atomic(void *kvaddr); extern void *kmap_atomic_pfn(unsigned long pfn); extern struct page *kmap_atomic_to_page(void *ptr); --- a/arch/csky/mm/highmem.c~arch-kmap_atomic-consolidate-duplicate-code +++ a/arch/csky/mm/highmem.c @@ -21,16 +21,11 @@ EXPORT_SYMBOL(kmap_flush_tlb); EXPORT_SYMBOL(kmap); -void *kmap_atomic(struct page *page) +void *kmap_atomic_high(struct page *page) { unsigned long vaddr; int idx, type; - preempt_disable(); - pagefault_disable(); - if (!PageHighMem(page)) - return page_address(page); - type = kmap_atomic_idx_push(); idx = type + KM_TYPE_NR*smp_processor_id(); vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx); @@ -42,7 +37,7 @@ void *kmap_atomic(struct page *page) return (void *)vaddr; } -EXPORT_SYMBOL(kmap_atomic); +EXPORT_SYMBOL(kmap_atomic_high); void __kunmap_atomic(void *kvaddr) { --- a/arch/microblaze/include/asm/highmem.h~arch-kmap_atomic-consolidate-duplicate-code +++ a/arch/microblaze/include/asm/highmem.h @@ -63,9 +63,9 @@ static inline void *kmap_atomic_prot(str } extern void __kunmap_atomic(void *kvaddr); -static inline void *kmap_atomic(struct page *page) +static inline void *kmap_atomic_high(struct page *page) { - return kmap_atomic_prot(page, kmap_prot); + return kmap_atomic_high_prot(page, kmap_prot); } #define flush_cache_kmaps() { flush_icache(); flush_dcache(); } --- a/arch/mips/include/asm/highmem.h~arch-kmap_atomic-consolidate-duplicate-code +++ a/arch/mips/include/asm/highmem.h @@ -48,7 +48,6 @@ extern pte_t *pkmap_page_table; #define ARCH_HAS_KMAP_FLUSH_TLB extern void kmap_flush_tlb(unsigned long addr); -extern void *kmap_atomic(struct page *page); extern void __kunmap_atomic(void *kvaddr); extern void *kmap_atomic_pfn(unsigned long pfn); --- a/arch/mips/mm/cache.c~arch-kmap_atomic-consolidate-duplicate-code +++ a/arch/mips/mm/cache.c @@ -14,9 +14,9 @@ #include <linux/sched.h> #include <linux/syscalls.h> #include <linux/mm.h> +#include <linux/highmem.h> #include <asm/cacheflush.h> -#include <asm/highmem.h> #include <asm/processor.h> #include <asm/cpu.h> #include <asm/cpu-features.h> --- a/arch/mips/mm/highmem.c~arch-kmap_atomic-consolidate-duplicate-code +++ a/arch/mips/mm/highmem.c @@ -18,25 +18,11 @@ void kmap_flush_tlb(unsigned long addr) } EXPORT_SYMBOL(kmap_flush_tlb); -/* - * kmap_atomic/kunmap_atomic is significantly faster than kmap/kunmap because - * no global lock is needed and because the kmap code must perform a global TLB - * invalidation when the kmap pool wraps. - * - * However when holding an atomic kmap is is not legal to sleep, so atomic - * kmaps are appropriate for short, tight code paths only. - */ - -void *kmap_atomic(struct page *page) +void *kmap_atomic_high(struct page *page) { unsigned long vaddr; int idx, type; - preempt_disable(); - pagefault_disable(); - if (!PageHighMem(page)) - return page_address(page); - type = kmap_atomic_idx_push(); idx = type + KM_TYPE_NR*smp_processor_id(); vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx); @@ -48,7 +34,7 @@ void *kmap_atomic(struct page *page) return (void*) vaddr; } -EXPORT_SYMBOL(kmap_atomic); +EXPORT_SYMBOL(kmap_atomic_high); void __kunmap_atomic(void *kvaddr) { --- a/arch/nds32/include/asm/highmem.h~arch-kmap_atomic-consolidate-duplicate-code +++ a/arch/nds32/include/asm/highmem.h @@ -51,7 +51,6 @@ extern void kmap_init(void); * when CONFIG_HIGHMEM is not set. */ #ifdef CONFIG_HIGHMEM -extern void *kmap_atomic(struct page *page); extern void __kunmap_atomic(void *kvaddr); extern void *kmap_atomic_pfn(unsigned long pfn); extern struct page *kmap_atomic_to_page(void *ptr); --- a/arch/nds32/mm/highmem.c~arch-kmap_atomic-consolidate-duplicate-code +++ a/arch/nds32/mm/highmem.c @@ -10,18 +10,13 @@ #include <asm/fixmap.h> #include <asm/tlbflush.h> -void *kmap_atomic(struct page *page) +void *kmap_atomic_high(struct page *page) { unsigned int idx; unsigned long vaddr, pte; int type; pte_t *ptep; - preempt_disable(); - pagefault_disable(); - if (!PageHighMem(page)) - return page_address(page); - type = kmap_atomic_idx_push(); idx = type + KM_TYPE_NR * smp_processor_id(); @@ -36,8 +31,7 @@ void *kmap_atomic(struct page *page) __nds32__isb(); return (void *)vaddr; } - -EXPORT_SYMBOL(kmap_atomic); +EXPORT_SYMBOL(kmap_atomic_high); void __kunmap_atomic(void *kvaddr) { @@ -53,5 +47,4 @@ void __kunmap_atomic(void *kvaddr) pagefault_enable(); preempt_enable(); } - EXPORT_SYMBOL(__kunmap_atomic); --- a/arch/powerpc/include/asm/highmem.h~arch-kmap_atomic-consolidate-duplicate-code +++ a/arch/powerpc/include/asm/highmem.h @@ -71,9 +71,9 @@ static inline void *kmap_atomic_prot(str } extern void __kunmap_atomic(void *kvaddr); -static inline void *kmap_atomic(struct page *page) +static inline void *kmap_atomic_high(struct page *page) { - return kmap_atomic_prot(page, kmap_prot); + return kmap_atomic_high_prot(page, kmap_prot); } --- a/arch/powerpc/mm/highmem.c~arch-kmap_atomic-consolidate-duplicate-code +++ a/arch/powerpc/mm/highmem.c @@ -24,12 +24,6 @@ #include <linux/highmem.h> #include <linux/module.h> -/* - * The use of kmap_atomic/kunmap_atomic is discouraged - kmap/kunmap - * gives a more generic (and caching) interface. But kmap_atomic can - * be used in IRQ contexts, so in some (very limited) cases we need - * it. - */ void *kmap_atomic_high_prot(struct page *page, pgprot_t prot) { unsigned long vaddr; --- a/arch/sparc/include/asm/highmem.h~arch-kmap_atomic-consolidate-duplicate-code +++ a/arch/sparc/include/asm/highmem.h @@ -50,7 +50,6 @@ void kmap_init(void) __init; #define PKMAP_END (PKMAP_ADDR(LAST_PKMAP)) -void *kmap_atomic(struct page *page); void __kunmap_atomic(void *kvaddr); #define flush_cache_kmaps() flush_cache_all() --- a/arch/sparc/mm/highmem.c~arch-kmap_atomic-consolidate-duplicate-code +++ a/arch/sparc/mm/highmem.c @@ -53,16 +53,11 @@ void __init kmap_init(void) kmap_prot = __pgprot(SRMMU_ET_PTE | SRMMU_PRIV | SRMMU_CACHE); } -void *kmap_atomic(struct page *page) +void *kmap_atomic_high(struct page *page) { unsigned long vaddr; long idx, type; - preempt_disable(); - pagefault_disable(); - if (!PageHighMem(page)) - return page_address(page); - type = kmap_atomic_idx_push(); idx = type + KM_TYPE_NR*smp_processor_id(); vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx); @@ -87,7 +82,7 @@ void *kmap_atomic(struct page *page) return (void*) vaddr; } -EXPORT_SYMBOL(kmap_atomic); +EXPORT_SYMBOL(kmap_atomic_high); void __kunmap_atomic(void *kvaddr) { --- a/arch/x86/include/asm/highmem.h~arch-kmap_atomic-consolidate-duplicate-code +++ a/arch/x86/include/asm/highmem.h @@ -68,7 +68,10 @@ static inline void *kmap_atomic_prot(str return kmap_atomic_high_prot(page, prot); } -void *kmap_atomic(struct page *page); +static inline void *kmap_atomic_high(struct page *page) +{ + return kmap_atomic_high_prot(page, kmap_prot); +} void __kunmap_atomic(void *kvaddr); void *kmap_atomic_pfn(unsigned long pfn); void *kmap_atomic_prot_pfn(unsigned long pfn, pgprot_t prot); --- a/arch/x86/mm/highmem_32.c~arch-kmap_atomic-consolidate-duplicate-code +++ a/arch/x86/mm/highmem_32.c @@ -4,14 +4,6 @@ #include <linux/swap.h> /* for totalram_pages */ #include <linux/memblock.h> -/* - * kmap_atomic/kunmap_atomic is significantly faster than kmap/kunmap because - * no global lock is needed and because the kmap code must perform a global TLB - * invalidation when the kmap pool wraps. - * - * However when holding an atomic kmap it is not legal to sleep, so atomic - * kmaps are appropriate for short, tight code paths only. - */ void *kmap_atomic_high_prot(struct page *page, pgprot_t prot) { unsigned long vaddr; @@ -28,12 +20,6 @@ void *kmap_atomic_high_prot(struct page } EXPORT_SYMBOL(kmap_atomic_high_prot); -void *kmap_atomic(struct page *page) -{ - return kmap_atomic_prot(page, kmap_prot); -} -EXPORT_SYMBOL(kmap_atomic); - /* * This is the same as kmap_atomic() but can map memory that doesn't * have a struct page associated with it. --- a/arch/xtensa/include/asm/highmem.h~arch-kmap_atomic-consolidate-duplicate-code +++ a/arch/xtensa/include/asm/highmem.h @@ -68,7 +68,6 @@ static inline void flush_cache_kmaps(voi flush_cache_all(); } -void *kmap_atomic(struct page *page); void __kunmap_atomic(void *kvaddr); void kmap_init(void); --- a/arch/xtensa/mm/highmem.c~arch-kmap_atomic-consolidate-duplicate-code +++ a/arch/xtensa/mm/highmem.c @@ -37,16 +37,11 @@ static inline enum fixed_addresses kmap_ color; } -void *kmap_atomic(struct page *page) +void *kmap_atomic_high(struct page *page) { enum fixed_addresses idx; unsigned long vaddr; - preempt_disable(); - pagefault_disable(); - if (!PageHighMem(page)) - return page_address(page); - idx = kmap_idx(kmap_atomic_idx_push(), DCACHE_ALIAS(page_to_phys(page))); vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx); @@ -57,7 +52,7 @@ void *kmap_atomic(struct page *page) return (void *)vaddr; } -EXPORT_SYMBOL(kmap_atomic); +EXPORT_SYMBOL(kmap_atomic_high); void __kunmap_atomic(void *kvaddr) { --- a/include/linux/highmem.h~arch-kmap_atomic-consolidate-duplicate-code +++ a/include/linux/highmem.h @@ -32,6 +32,7 @@ static inline void invalidate_kernel_vma #include <asm/kmap_types.h> #ifdef CONFIG_HIGHMEM +extern void *kmap_atomic_high(struct page *page); #include <asm/highmem.h> #ifndef ARCH_HAS_KMAP_FLUSH_TLB @@ -62,6 +63,28 @@ static inline void kunmap(struct page *p kunmap_high(page); } +/* + * kmap_atomic/kunmap_atomic is significantly faster than kmap/kunmap because + * no global lock is needed and because the kmap code must perform a global TLB + * invalidation when the kmap pool wraps. + * + * However when holding an atomic kmap is is not legal to sleep, so atomic + * kmaps are appropriate for short, tight code paths only. + * + * The use of kmap_atomic/kunmap_atomic is discouraged - kmap/kunmap + * gives a more generic (and caching) interface. But kmap_atomic can + * be used in IRQ contexts, so in some (very limited) cases we need + * it. + */ +static inline void *kmap_atomic(struct page *page) +{ + preempt_disable(); + pagefault_disable(); + if (!PageHighMem(page)) + return page_address(page); + return kmap_atomic_high(page); +} + /* declarations for linux/mm/highmem.c */ unsigned int nr_free_highpages(void); extern atomic_long_t _totalhigh_pages; _
