[PATCH V3 07/15] arch/kunmap_atomic: Consolidate duplicate code

From: Ira Weiny ira.weiny@intel.com

Every single architecture (including !CONFIG_HIGHMEM) calls...

pagefault_enable(); preempt_enable();

... before returning from __kunmap_atomic(). Lift this code into the kunmap_atomic() macro.

While we are at it rename __kunmap_atomic() to kunmap_atomic_high() to be consistent.

Reviewed-by: Christoph Hellwig hch@lst.de Signed-off-by: Ira Weiny ira.weiny@intel.com

--- Changes from V1: Adjust to preserve bisect-ability Remove uneeded kunmap_atomic_high() declarations --- arch/arc/include/asm/highmem.h | 2 -- arch/arc/mm/highmem.c | 7 ++----- arch/arm/include/asm/highmem.h | 1 - arch/arm/mm/highmem.c | 6 ++---- arch/csky/include/asm/highmem.h | 1 - arch/csky/mm/highmem.c | 9 +++------ arch/microblaze/include/asm/highmem.h | 1 - arch/microblaze/mm/highmem.c | 6 ++---- arch/mips/include/asm/highmem.h | 1 - arch/mips/mm/cache.c | 4 ++-- arch/mips/mm/highmem.c | 6 ++---- arch/nds32/include/asm/highmem.h | 1 - arch/nds32/mm/highmem.c | 6 ++---- arch/parisc/include/asm/cacheflush.h | 4 +--- arch/powerpc/include/asm/highmem.h | 1 - arch/powerpc/mm/highmem.c | 6 ++---- arch/sparc/include/asm/highmem.h | 2 -- arch/sparc/mm/highmem.c | 6 ++---- arch/x86/include/asm/highmem.h | 1 - arch/x86/mm/highmem_32.c | 7 ++----- arch/xtensa/include/asm/highmem.h | 2 -- arch/xtensa/mm/highmem.c | 7 ++----- include/linux/highmem.h | 11 +++++++---- 23 files changed, 31 insertions(+), 67 deletions(-)

diff --git a/arch/arc/include/asm/highmem.h b/arch/arc/include/asm/highmem.h index db425cd38545..70900a73bfc8 100644 --- a/arch/arc/include/asm/highmem.h +++ b/arch/arc/include/asm/highmem.h @@ -30,8 +30,6 @@

#include <asm/cacheflush.h>

-extern void __kunmap_atomic(void *kvaddr); - extern void kmap_init(void);

static inline void flush_cache_kmaps(void) diff --git a/arch/arc/mm/highmem.c b/arch/arc/mm/highmem.c index 0964b011c29f..5d3eab4ac0b0 100644 --- a/arch/arc/mm/highmem.c +++ b/arch/arc/mm/highmem.c @@ -65,7 +65,7 @@ void *kmap_atomic_high(struct page *page) } EXPORT_SYMBOL(kmap_atomic_high);

-void __kunmap_atomic(void *kv) +void kunmap_atomic_high(void *kv) { unsigned long kvaddr = (unsigned long)kv;

@@ -87,11 +87,8 @@ void __kunmap_atomic(void *kv)

kmap_atomic_idx_pop(); } - - pagefault_enable(); - preempt_enable(); } -EXPORT_SYMBOL(__kunmap_atomic); +EXPORT_SYMBOL(kunmap_atomic_high);

static noinline pte_t * __init alloc_kmap_pgtable(unsigned long kvaddr) { diff --git a/arch/arm/include/asm/highmem.h b/arch/arm/include/asm/highmem.h index 8c80bfe18a34..b0d4bd8dc3c1 100644 --- a/arch/arm/include/asm/highmem.h +++ b/arch/arm/include/asm/highmem.h @@ -60,7 +60,6 @@ static inline void *kmap_high_get(struct page *page) * when CONFIG_HIGHMEM is not set. */ #ifdef CONFIG_HIGHMEM -extern void __kunmap_atomic(void *kvaddr); extern void *kmap_atomic_pfn(unsigned long pfn); #endif

diff --git a/arch/arm/mm/highmem.c b/arch/arm/mm/highmem.c index 075fdc235091..ac8394655a6e 100644 --- a/arch/arm/mm/highmem.c +++ b/arch/arm/mm/highmem.c @@ -73,7 +73,7 @@ void *kmap_atomic_high(struct page *page) } EXPORT_SYMBOL(kmap_atomic_high);

-void __kunmap_atomic(void *kvaddr) +void kunmap_atomic_high(void *kvaddr) { unsigned long vaddr = (unsigned long) kvaddr & PAGE_MASK; int idx, type; @@ -95,10 +95,8 @@ void __kunmap_atomic(void *kvaddr) /* this address was obtained through kmap_high_get() */ kunmap_high(pte_page(pkmap_page_table[PKMAP_NR(vaddr)])); } - pagefault_enable(); - preempt_enable(); } -EXPORT_SYMBOL(__kunmap_atomic); +EXPORT_SYMBOL(kunmap_atomic_high);

void *kmap_atomic_pfn(unsigned long pfn) { diff --git a/arch/csky/include/asm/highmem.h b/arch/csky/include/asm/highmem.h index 8ceee12f9bc1..263fbddcd0a3 100644 --- a/arch/csky/include/asm/highmem.h +++ b/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 __kunmap_atomic(void *kvaddr); extern void *kmap_atomic_pfn(unsigned long pfn); extern struct page *kmap_atomic_to_page(void *ptr);

diff --git a/arch/csky/mm/highmem.c b/arch/csky/mm/highmem.c index 63d74b47eee6..0aafbbbe651c 100644 --- a/arch/csky/mm/highmem.c +++ b/arch/csky/mm/highmem.c @@ -39,13 +39,13 @@ void *kmap_atomic_high(struct page *page) } EXPORT_SYMBOL(kmap_atomic_high);

-void __kunmap_atomic(void *kvaddr) +void kunmap_atomic_high(void *kvaddr) { unsigned long vaddr = (unsigned long) kvaddr & PAGE_MASK; int idx;

if (vaddr < FIXADDR_START) - goto out; + return;

#ifdef CONFIG_DEBUG_HIGHMEM idx = KM_TYPE_NR*smp_processor_id() + kmap_atomic_idx(); @@ -58,11 +58,8 @@ void __kunmap_atomic(void *kvaddr) (void) idx; /* to kill a warning */ #endif kmap_atomic_idx_pop(); -out: - pagefault_enable(); - preempt_enable(); } -EXPORT_SYMBOL(__kunmap_atomic); +EXPORT_SYMBOL(kunmap_atomic_high);

/* * This is the same as kmap_atomic() but can map memory that doesn't diff --git a/arch/microblaze/include/asm/highmem.h b/arch/microblaze/include/asm/highmem.h index f7c5467df5ad..c3cbda90391d 100644 --- a/arch/microblaze/include/asm/highmem.h +++ b/arch/microblaze/include/asm/highmem.h @@ -61,7 +61,6 @@ static inline void *kmap_atomic_prot(struct page *page, pgprot_t prot)

return kmap_atomic_high_prot(page, prot); } -extern void __kunmap_atomic(void *kvaddr);

static inline void *kmap_atomic_high(struct page *page) { diff --git a/arch/microblaze/mm/highmem.c b/arch/microblaze/mm/highmem.c index 0e3efaa8a004..ee8a422b2b76 100644 --- a/arch/microblaze/mm/highmem.c +++ b/arch/microblaze/mm/highmem.c @@ -51,7 +51,7 @@ void *kmap_atomic_high_prot(struct page *page, pgprot_t prot) } EXPORT_SYMBOL(kmap_atomic_high_prot);

-void __kunmap_atomic(void *kvaddr) +void kunmap_atomic_high(void *kvaddr) { unsigned long vaddr = (unsigned long) kvaddr & PAGE_MASK; int type; @@ -77,7 +77,5 @@ void __kunmap_atomic(void *kvaddr) local_flush_tlb_page(NULL, vaddr);

kmap_atomic_idx_pop(); - pagefault_enable(); - preempt_enable(); } -EXPORT_SYMBOL(__kunmap_atomic); +EXPORT_SYMBOL(kunmap_atomic_high); diff --git a/arch/mips/include/asm/highmem.h b/arch/mips/include/asm/highmem.h index 8bdbbfc322ad..76dec0bd4f59 100644 --- a/arch/mips/include/asm/highmem.h +++ b/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 __kunmap_atomic(void *kvaddr); extern void *kmap_atomic_pfn(unsigned long pfn);

#define flush_cache_kmaps() BUG_ON(cpu_has_dc_aliases) diff --git a/arch/mips/mm/cache.c b/arch/mips/mm/cache.c index f015bb51fab0..1873c2a01fdb 100644 --- a/arch/mips/mm/cache.c +++ b/arch/mips/mm/cache.c @@ -104,7 +104,7 @@ void __flush_dcache_page(struct page *page) flush_data_cache_page(addr);

if (PageHighMem(page)) - __kunmap_atomic((void *)addr); + kunmap_atomic((void *)addr); }

EXPORT_SYMBOL(__flush_dcache_page); @@ -147,7 +147,7 @@ void __update_cache(unsigned long address, pte_t pte) flush_data_cache_page(addr);

if (PageHighMem(page)) - __kunmap_atomic((void *)addr); + kunmap_atomic((void *)addr);

ClearPageDcacheDirty(page); } diff --git a/arch/mips/mm/highmem.c b/arch/mips/mm/highmem.c index 2bda56372995..155fbb107b35 100644 --- a/arch/mips/mm/highmem.c +++ b/arch/mips/mm/highmem.c @@ -36,7 +36,7 @@ void *kmap_atomic_high(struct page *page) } EXPORT_SYMBOL(kmap_atomic_high);

-void __kunmap_atomic(void *kvaddr) +void kunmap_atomic_high(void *kvaddr) { unsigned long vaddr = (unsigned long) kvaddr & PAGE_MASK; int type __maybe_unused; @@ -63,10 +63,8 @@ void __kunmap_atomic(void *kvaddr) } #endif kmap_atomic_idx_pop(); - pagefault_enable(); - preempt_enable(); } -EXPORT_SYMBOL(__kunmap_atomic); +EXPORT_SYMBOL(kunmap_atomic_high);

/* * This is the same as kmap_atomic() but can map memory that doesn't diff --git a/arch/nds32/include/asm/highmem.h b/arch/nds32/include/asm/highmem.h index a3970e566ede..4d21308549c9 100644 --- a/arch/nds32/include/asm/highmem.h +++ b/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 __kunmap_atomic(void *kvaddr); extern void *kmap_atomic_pfn(unsigned long pfn); extern struct page *kmap_atomic_to_page(void *ptr); #endif diff --git a/arch/nds32/mm/highmem.c b/arch/nds32/mm/highmem.c index f5f3a21460c4..f6e6915c0d31 100644 --- a/arch/nds32/mm/highmem.c +++ b/arch/nds32/mm/highmem.c @@ -34,7 +34,7 @@ void *kmap_atomic_high(struct page *page)

EXPORT_SYMBOL(kmap_atomic_high);

-void __kunmap_atomic(void *kvaddr) +void kunmap_atomic_high(void *kvaddr) { if (kvaddr >= (void *)FIXADDR_START) { unsigned long vaddr = (unsigned long)kvaddr; @@ -45,8 +45,6 @@ void __kunmap_atomic(void *kvaddr) ptep = pte_offset_kernel(pmd_off_k(vaddr), vaddr); set_pte(ptep, 0); } - pagefault_enable(); - preempt_enable(); }

-EXPORT_SYMBOL(__kunmap_atomic); +EXPORT_SYMBOL(kunmap_atomic_high); diff --git a/arch/parisc/include/asm/cacheflush.h b/arch/parisc/include/asm/cacheflush.h index 0c83644bfa5c..119c9a7681bc 100644 --- a/arch/parisc/include/asm/cacheflush.h +++ b/arch/parisc/include/asm/cacheflush.h @@ -122,11 +122,9 @@ static inline void *kmap_atomic(struct page *page) return page_address(page); }

-static inline void __kunmap_atomic(void *addr) +static inline void kunmap_atomic_high(void *addr) { flush_kernel_dcache_page_addr(addr); - pagefault_enable(); - preempt_enable(); }

#define kmap_atomic_prot(page, prot) kmap_atomic(page) diff --git a/arch/powerpc/include/asm/highmem.h b/arch/powerpc/include/asm/highmem.h index 74fa2c726fde..373a470df205 100644 --- a/arch/powerpc/include/asm/highmem.h +++ b/arch/powerpc/include/asm/highmem.h @@ -69,7 +69,6 @@ static inline void *kmap_atomic_prot(struct page *page, pgprot_t prot)

return kmap_atomic_high_prot(page, prot); } -extern void __kunmap_atomic(void *kvaddr);

static inline void *kmap_atomic_high(struct page *page) { diff --git a/arch/powerpc/mm/highmem.c b/arch/powerpc/mm/highmem.c index 67aaa5217f7f..35071c2913f1 100644 --- a/arch/powerpc/mm/highmem.c +++ b/arch/powerpc/mm/highmem.c @@ -40,7 +40,7 @@ void *kmap_atomic_high_prot(struct page *page, pgprot_t prot) } EXPORT_SYMBOL(kmap_atomic_high_prot);

-void __kunmap_atomic(void *kvaddr) +void kunmap_atomic_high(void *kvaddr) { unsigned long vaddr = (unsigned long) kvaddr & PAGE_MASK;

@@ -66,7 +66,5 @@ void __kunmap_atomic(void *kvaddr) }

kmap_atomic_idx_pop(); - pagefault_enable(); - preempt_enable(); } -EXPORT_SYMBOL(__kunmap_atomic); +EXPORT_SYMBOL(kunmap_atomic_high); diff --git a/arch/sparc/include/asm/highmem.h b/arch/sparc/include/asm/highmem.h index 458210c5bc38..f4babe67cb5d 100644 --- a/arch/sparc/include/asm/highmem.h +++ b/arch/sparc/include/asm/highmem.h @@ -50,8 +50,6 @@ void kmap_init(void) __init;

#define PKMAP_END (PKMAP_ADDR(LAST_PKMAP))

-void __kunmap_atomic(void *kvaddr); - #define flush_cache_kmaps() flush_cache_all()

#endif /* __KERNEL__ */ diff --git a/arch/sparc/mm/highmem.c b/arch/sparc/mm/highmem.c index b53070ab6a31..469786bc430f 100644 --- a/arch/sparc/mm/highmem.c +++ b/arch/sparc/mm/highmem.c @@ -84,7 +84,7 @@ void *kmap_atomic_high(struct page *page) } EXPORT_SYMBOL(kmap_atomic_high);

-void __kunmap_atomic(void *kvaddr) +void kunmap_atomic_high(void *kvaddr) { unsigned long vaddr = (unsigned long) kvaddr & PAGE_MASK; int type; @@ -126,7 +126,5 @@ void __kunmap_atomic(void *kvaddr) #endif

kmap_atomic_idx_pop(); - pagefault_enable(); - preempt_enable(); } -EXPORT_SYMBOL(__kunmap_atomic); +EXPORT_SYMBOL(kunmap_atomic_high); diff --git a/arch/x86/include/asm/highmem.h b/arch/x86/include/asm/highmem.h index 9393d55a2adb..be66b77885a0 100644 --- a/arch/x86/include/asm/highmem.h +++ b/arch/x86/include/asm/highmem.h @@ -72,7 +72,6 @@ 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);

diff --git a/arch/x86/mm/highmem_32.c b/arch/x86/mm/highmem_32.c index c3e272a759e0..075fe51317b0 100644 --- a/arch/x86/mm/highmem_32.c +++ b/arch/x86/mm/highmem_32.c @@ -30,7 +30,7 @@ void *kmap_atomic_pfn(unsigned long pfn) } EXPORT_SYMBOL_GPL(kmap_atomic_pfn);

-void __kunmap_atomic(void *kvaddr) +void kunmap_atomic_high(void *kvaddr) { unsigned long vaddr = (unsigned long) kvaddr & PAGE_MASK;

@@ -60,11 +60,8 @@ void __kunmap_atomic(void *kvaddr) BUG_ON(vaddr >= (unsigned long)high_memory); } #endif - - pagefault_enable(); - preempt_enable(); } -EXPORT_SYMBOL(__kunmap_atomic); +EXPORT_SYMBOL(kunmap_atomic_high);

void __init set_highmem_pages_init(void) { diff --git a/arch/xtensa/include/asm/highmem.h b/arch/xtensa/include/asm/highmem.h index 1e6aa15c4bdf..d6a10704307a 100644 --- a/arch/xtensa/include/asm/highmem.h +++ b/arch/xtensa/include/asm/highmem.h @@ -68,8 +68,6 @@ static inline void flush_cache_kmaps(void) flush_cache_all(); }

-void __kunmap_atomic(void *kvaddr); - void kmap_init(void);

#endif diff --git a/arch/xtensa/mm/highmem.c b/arch/xtensa/mm/highmem.c index 90b85a897cb0..4de323e43682 100644 --- a/arch/xtensa/mm/highmem.c +++ b/arch/xtensa/mm/highmem.c @@ -54,7 +54,7 @@ void *kmap_atomic_high(struct page *page) } EXPORT_SYMBOL(kmap_atomic_high);

-void __kunmap_atomic(void *kvaddr) +void kunmap_atomic_high(void *kvaddr) { if (kvaddr >= (void *)FIXADDR_START && kvaddr < (void *)FIXADDR_TOP) { @@ -73,11 +73,8 @@ void __kunmap_atomic(void *kvaddr)

kmap_atomic_idx_pop(); } - - pagefault_enable(); - preempt_enable(); } -EXPORT_SYMBOL(__kunmap_atomic); +EXPORT_SYMBOL(kunmap_atomic_high);

void __init kmap_init(void) { diff --git a/include/linux/highmem.h b/include/linux/highmem.h index 86b93dee758a..c36c0ee09423 100644 --- a/include/linux/highmem.h +++ b/include/linux/highmem.h @@ -33,6 +33,7 @@ static inline void invalidate_kernel_vmap_range(void *vaddr, int size)

#ifdef CONFIG_HIGHMEM extern void *kmap_atomic_high(struct page *page); +extern void kunmap_atomic_high(void *kvaddr); #include <asm/highmem.h>

#ifndef ARCH_HAS_KMAP_FLUSH_TLB @@ -146,10 +147,10 @@ static inline void *kmap_atomic(struct page *page) } #define kmap_atomic_prot(page, prot) kmap_atomic(page)

-static inline void __kunmap_atomic(void *addr) +static inline void kunmap_atomic_high(void *addr) { - pagefault_enable(); - preempt_enable(); + /* Nothing to do in the CONFIG_HIGHMEM=n case as kunmap_atomic() + * handles re-enabling faults + preemption */ }

#define kmap_atomic_pfn(pfn) kmap_atomic(pfn_to_page(pfn)) @@ -199,7 +200,9 @@ static inline void kmap_atomic_idx_pop(void) #define kunmap_atomic(addr) \ do { \ BUILD_BUG_ON(__same_type((addr), struct page *)); \ - __kunmap_atomic(addr); \ + kunmap_atomic_high(addr); \ + pagefault_enable(); \ + preempt_enable(); \ } while (0)