From: Ira Weiny <ira.weiny@xxxxxxxxx> Subject: arch/kmap: remove redundant arch specific kmaps The kmap code for all the architectures is almost 100% identical. Lift the common code to the core. Use ARCH_HAS_KMAP_FLUSH_TLB to indicate if an arch defines kmap_flush_tlb() and call if if needed. This also has the benefit of changing kmap() on a number of architectures to be an inline call rather than an actual function. Link: http://lkml.kernel.org/r/20200507150004.1423069-4-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 | 2 -- arch/arc/mm/highmem.c | 10 ---------- arch/arm/include/asm/highmem.h | 2 -- arch/arm/mm/highmem.c | 9 --------- arch/csky/include/asm/highmem.h | 4 ++-- arch/csky/mm/highmem.c | 14 ++++---------- arch/microblaze/include/asm/highmem.h | 9 --------- arch/mips/include/asm/highmem.h | 4 ++-- arch/mips/mm/highmem.c | 14 +++----------- arch/nds32/include/asm/highmem.h | 2 -- arch/nds32/mm/highmem.c | 12 ------------ arch/powerpc/include/asm/highmem.h | 9 --------- arch/sparc/include/asm/highmem.h | 9 --------- arch/x86/include/asm/highmem.h | 2 -- arch/x86/mm/highmem_32.c | 9 --------- arch/xtensa/include/asm/highmem.h | 9 --------- include/linux/highmem.h | 18 ++++++++++++++++++ 17 files changed, 29 insertions(+), 109 deletions(-) --- a/arch/arc/include/asm/highmem.h~arch-kmap-remove-redundant-arch-specific-kmaps +++ a/arch/arc/include/asm/highmem.h @@ -30,8 +30,6 @@ #include <asm/cacheflush.h> -extern void *kmap(struct page *page); -extern void *kmap_high(struct page *page); extern void *kmap_atomic(struct page *page); extern void __kunmap_atomic(void *kvaddr); extern void kunmap_high(struct page *page); --- a/arch/arc/mm/highmem.c~arch-kmap-remove-redundant-arch-specific-kmaps +++ a/arch/arc/mm/highmem.c @@ -49,16 +49,6 @@ extern pte_t * pkmap_page_table; static pte_t * fixmap_page_table; -void *kmap(struct page *page) -{ - might_sleep(); - if (!PageHighMem(page)) - return page_address(page); - - return kmap_high(page); -} -EXPORT_SYMBOL(kmap); - void *kmap_atomic(struct page *page) { int idx, cpu_idx; --- a/arch/arm/include/asm/highmem.h~arch-kmap-remove-redundant-arch-specific-kmaps +++ a/arch/arm/include/asm/highmem.h @@ -20,7 +20,6 @@ extern pte_t *pkmap_page_table; -extern void *kmap_high(struct page *page); extern void kunmap_high(struct page *page); /* @@ -63,7 +62,6 @@ static inline void *kmap_high_get(struct * when CONFIG_HIGHMEM is not set. */ #ifdef CONFIG_HIGHMEM -extern void *kmap(struct page *page); extern void kunmap(struct page *page); extern void *kmap_atomic(struct page *page); extern void __kunmap_atomic(void *kvaddr); --- a/arch/arm/mm/highmem.c~arch-kmap-remove-redundant-arch-specific-kmaps +++ a/arch/arm/mm/highmem.c @@ -31,15 +31,6 @@ static inline pte_t get_fixmap_pte(unsig return *ptep; } -void *kmap(struct page *page) -{ - might_sleep(); - if (!PageHighMem(page)) - return page_address(page); - return kmap_high(page); -} -EXPORT_SYMBOL(kmap); - void kunmap(struct page *page) { might_sleep(); --- a/arch/csky/include/asm/highmem.h~arch-kmap-remove-redundant-arch-specific-kmaps +++ a/arch/csky/include/asm/highmem.h @@ -30,10 +30,10 @@ extern pte_t *pkmap_page_table; #define PKMAP_NR(virt) ((virt-PKMAP_BASE) >> PAGE_SHIFT) #define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT)) -extern void *kmap_high(struct page *page); extern void kunmap_high(struct page *page); -extern void *kmap(struct page *page); +#define ARCH_HAS_KMAP_FLUSH_TLB +extern void kmap_flush_tlb(unsigned long addr); extern void kunmap(struct page *page); extern void *kmap_atomic(struct page *page); extern void __kunmap_atomic(void *kvaddr); --- a/arch/csky/mm/highmem.c~arch-kmap-remove-redundant-arch-specific-kmaps +++ a/arch/csky/mm/highmem.c @@ -13,18 +13,12 @@ static pte_t *kmap_pte; unsigned long highstart_pfn, highend_pfn; -void *kmap(struct page *page) +void kmap_flush_tlb(unsigned long addr) { - void *addr; - - might_sleep(); - if (!PageHighMem(page)) - return page_address(page); - addr = kmap_high(page); - flush_tlb_one((unsigned long)addr); - - return addr; + flush_tlb_one(addr); } +EXPORT_SYMBOL(kmap_flush_tlb); + EXPORT_SYMBOL(kmap); void kunmap(struct page *page) --- a/arch/microblaze/include/asm/highmem.h~arch-kmap-remove-redundant-arch-specific-kmaps +++ a/arch/microblaze/include/asm/highmem.h @@ -51,19 +51,10 @@ extern pte_t *pkmap_page_table; #define PKMAP_NR(virt) ((virt - PKMAP_BASE) >> PAGE_SHIFT) #define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT)) -extern void *kmap_high(struct page *page); extern void kunmap_high(struct page *page); extern void *kmap_atomic_prot(struct page *page, pgprot_t prot); extern void __kunmap_atomic(void *kvaddr); -static inline void *kmap(struct page *page) -{ - might_sleep(); - if (!PageHighMem(page)) - return page_address(page); - return kmap_high(page); -} - static inline void kunmap(struct page *page) { might_sleep(); --- a/arch/mips/include/asm/highmem.h~arch-kmap-remove-redundant-arch-specific-kmaps +++ a/arch/mips/include/asm/highmem.h @@ -46,10 +46,10 @@ extern pte_t *pkmap_page_table; #define PKMAP_NR(virt) ((virt-PKMAP_BASE) >> PAGE_SHIFT) #define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT)) -extern void * kmap_high(struct page *page); extern void kunmap_high(struct page *page); -extern void *kmap(struct page *page); +#define ARCH_HAS_KMAP_FLUSH_TLB +extern void kmap_flush_tlb(unsigned long addr); extern void kunmap(struct page *page); extern void *kmap_atomic(struct page *page); extern void __kunmap_atomic(void *kvaddr); --- a/arch/mips/mm/highmem.c~arch-kmap-remove-redundant-arch-specific-kmaps +++ a/arch/mips/mm/highmem.c @@ -12,19 +12,11 @@ static pte_t *kmap_pte; unsigned long highstart_pfn, highend_pfn; -void *kmap(struct page *page) +void kmap_flush_tlb(unsigned long addr) { - void *addr; - - might_sleep(); - if (!PageHighMem(page)) - return page_address(page); - addr = kmap_high(page); - flush_tlb_one((unsigned long)addr); - - return addr; + flush_tlb_one(addr); } -EXPORT_SYMBOL(kmap); +EXPORT_SYMBOL(kmap_flush_tlb); void kunmap(struct page *page) { --- a/arch/nds32/include/asm/highmem.h~arch-kmap-remove-redundant-arch-specific-kmaps +++ a/arch/nds32/include/asm/highmem.h @@ -44,7 +44,6 @@ extern unsigned long highstart_pfn, high extern pte_t *pkmap_page_table; -extern void *kmap_high(struct page *page); extern void kunmap_high(struct page *page); extern void kmap_init(void); @@ -54,7 +53,6 @@ extern void kmap_init(void); * when CONFIG_HIGHMEM is not set. */ #ifdef CONFIG_HIGHMEM -extern void *kmap(struct page *page); extern void kunmap(struct page *page); extern void *kmap_atomic(struct page *page); extern void __kunmap_atomic(void *kvaddr); --- a/arch/nds32/mm/highmem.c~arch-kmap-remove-redundant-arch-specific-kmaps +++ a/arch/nds32/mm/highmem.c @@ -10,18 +10,6 @@ #include <asm/fixmap.h> #include <asm/tlbflush.h> -void *kmap(struct page *page) -{ - unsigned long vaddr; - might_sleep(); - if (!PageHighMem(page)) - return page_address(page); - vaddr = (unsigned long)kmap_high(page); - return (void *)vaddr; -} - -EXPORT_SYMBOL(kmap); - void kunmap(struct page *page) { might_sleep(); --- a/arch/powerpc/include/asm/highmem.h~arch-kmap-remove-redundant-arch-specific-kmaps +++ a/arch/powerpc/include/asm/highmem.h @@ -59,19 +59,10 @@ extern pte_t *pkmap_page_table; #define PKMAP_NR(virt) ((virt-PKMAP_BASE) >> PAGE_SHIFT) #define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT)) -extern void *kmap_high(struct page *page); extern void kunmap_high(struct page *page); extern void *kmap_atomic_prot(struct page *page, pgprot_t prot); extern void __kunmap_atomic(void *kvaddr); -static inline void *kmap(struct page *page) -{ - might_sleep(); - if (!PageHighMem(page)) - return page_address(page); - return kmap_high(page); -} - static inline void kunmap(struct page *page) { might_sleep(); --- a/arch/sparc/include/asm/highmem.h~arch-kmap-remove-redundant-arch-specific-kmaps +++ a/arch/sparc/include/asm/highmem.h @@ -50,17 +50,8 @@ void kmap_init(void) __init; #define PKMAP_END (PKMAP_ADDR(LAST_PKMAP)) -void *kmap_high(struct page *page); void kunmap_high(struct page *page); -static inline void *kmap(struct page *page) -{ - might_sleep(); - if (!PageHighMem(page)) - return page_address(page); - return kmap_high(page); -} - static inline void kunmap(struct page *page) { might_sleep(); --- a/arch/x86/include/asm/highmem.h~arch-kmap-remove-redundant-arch-specific-kmaps +++ a/arch/x86/include/asm/highmem.h @@ -58,10 +58,8 @@ extern unsigned long highstart_pfn, high #define PKMAP_NR(virt) ((virt-PKMAP_BASE) >> PAGE_SHIFT) #define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT)) -extern void *kmap_high(struct page *page); extern void kunmap_high(struct page *page); -void *kmap(struct page *page); void kunmap(struct page *page); void *kmap_atomic_prot(struct page *page, pgprot_t prot); --- a/arch/x86/mm/highmem_32.c~arch-kmap-remove-redundant-arch-specific-kmaps +++ a/arch/x86/mm/highmem_32.c @@ -4,15 +4,6 @@ #include <linux/swap.h> /* for totalram_pages */ #include <linux/memblock.h> -void *kmap(struct page *page) -{ - might_sleep(); - if (!PageHighMem(page)) - return page_address(page); - return kmap_high(page); -} -EXPORT_SYMBOL(kmap); - void kunmap(struct page *page) { might_sleep(); --- a/arch/xtensa/include/asm/highmem.h~arch-kmap-remove-redundant-arch-specific-kmaps +++ a/arch/xtensa/include/asm/highmem.h @@ -63,17 +63,8 @@ static inline wait_queue_head_t *get_pkm extern pte_t *pkmap_page_table; -void *kmap_high(struct page *page); void kunmap_high(struct page *page); -static inline void *kmap(struct page *page) -{ - might_sleep(); - if (!PageHighMem(page)) - return page_address(page); - return kmap_high(page); -} - static inline void kunmap(struct page *page) { might_sleep(); --- a/include/linux/highmem.h~arch-kmap-remove-redundant-arch-specific-kmaps +++ a/include/linux/highmem.h @@ -34,6 +34,24 @@ static inline void invalidate_kernel_vma #ifdef CONFIG_HIGHMEM #include <asm/highmem.h> +#ifndef ARCH_HAS_KMAP_FLUSH_TLB +static inline void kmap_flush_tlb(unsigned long addr) { } +#endif + +void *kmap_high(struct page *page); +static inline void *kmap(struct page *page) +{ + void *addr; + + might_sleep(); + if (!PageHighMem(page)) + addr = page_address(page); + else + addr = kmap_high(page); + kmap_flush_tlb((unsigned long)addr); + return addr; +} + /* declarations for linux/mm/highmem.c */ unsigned int nr_free_highpages(void); extern atomic_long_t _totalhigh_pages; _
