arch/kmap: define kmap_atomic_prot() for all arch's

To support kmap_atomic_prot(), all architectures need to support
protections passed to their kmap_atomic_high() function.  Pass protections
into kmap_atomic_high() and change the name to kmap_atomic_high_prot() to
match.

Then define kmap_atomic_prot() as a core function which calls
kmap_atomic_high_prot() when needed.

Finally, redefine kmap_atomic() as a wrapper of kmap_atomic_prot() with
the default kmap_prot exported by the architectures.

Signed-off-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Christian König <christian.koenig@amd.com>
Cc: Chris Zankel <chris@zankel.net>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Helge Deller <deller@gmx.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20200507150004.1423069-11-ira.weiny@intel.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/arch/arc/mm/highmem.c b/arch/arc/mm/highmem.c
index 5d3eab4..479b0d7 100644 (file)
--- a/arch/arc/mm/highmem.c
+++ b/arch/arc/mm/highmem.c
@@ -49,7 +49,7 @@
 extern pte_t * pkmap_page_table;
 static pte_t * fixmap_page_table;
 
-void *kmap_atomic_high(struct page *page)
+void *kmap_atomic_high_prot(struct page *page, pgprot_t prot)
 {
        int idx, cpu_idx;
        unsigned long vaddr;
@@ -59,11 +59,11 @@ void *kmap_atomic_high(struct page *page)
        vaddr = FIXMAP_ADDR(idx);
 
        set_pte_at(&init_mm, vaddr, fixmap_page_table + idx,
-                  mk_pte(page, kmap_prot));
+                  mk_pte(page, prot));
 
        return (void *)vaddr;
 }
-EXPORT_SYMBOL(kmap_atomic_high);
+EXPORT_SYMBOL(kmap_atomic_high_prot);
 
 void kunmap_atomic_high(void *kv)
 {

diff --git a/arch/arm/mm/highmem.c b/arch/arm/mm/highmem.c
index ac83946..e013f6b 100644 (file)
--- a/arch/arm/mm/highmem.c
+++ b/arch/arm/mm/highmem.c
@@ -31,7 +31,7 @@ static inline pte_t get_fixmap_pte(unsigned long vaddr)
        return *ptep;
 }
 
-void *kmap_atomic_high(struct page *page)
+void *kmap_atomic_high_prot(struct page *page, pgprot_t prot)
 {
        unsigned int idx;
        unsigned long vaddr;
@@ -67,11 +67,11 @@ void *kmap_atomic_high(struct page *page)
         * in place, so the contained TLB flush ensures the TLB is updated
         * with the new mapping.
         */
-       set_fixmap_pte(idx, mk_pte(page, kmap_prot));
+       set_fixmap_pte(idx, mk_pte(page, prot));
 
        return (void *)vaddr;
 }
-EXPORT_SYMBOL(kmap_atomic_high);
+EXPORT_SYMBOL(kmap_atomic_high_prot);
 
 void kunmap_atomic_high(void *kvaddr)
 {

diff --git a/arch/csky/mm/highmem.c b/arch/csky/mm/highmem.c
index f431166..3ae5c8c 100644 (file)
--- a/arch/csky/mm/highmem.c
+++ b/arch/csky/mm/highmem.c
@@ -21,7 +21,7 @@ EXPORT_SYMBOL(kmap_flush_tlb);
 
 EXPORT_SYMBOL(kmap);
 
-void *kmap_atomic_high(struct page *page)
+void *kmap_atomic_high_prot(struct page *page, pgprot_t prot)
 {
        unsigned long vaddr;
        int idx, type;
@@ -32,12 +32,12 @@ void *kmap_atomic_high(struct page *page)
 #ifdef CONFIG_DEBUG_HIGHMEM
        BUG_ON(!pte_none(*(kmap_pte - idx)));
 #endif
-       set_pte(kmap_pte-idx, mk_pte(page, kmap_prot));
+       set_pte(kmap_pte-idx, mk_pte(page, prot));
        flush_tlb_one((unsigned long)vaddr);
 
        return (void *)vaddr;
 }
-EXPORT_SYMBOL(kmap_atomic_high);
+EXPORT_SYMBOL(kmap_atomic_high_prot);
 
 void kunmap_atomic_high(void *kvaddr)
 {

diff --git a/arch/microblaze/include/asm/highmem.h b/arch/microblaze/include/asm/highmem.h
index 90d9623..d7c55cf 100644 (file)
--- a/arch/microblaze/include/asm/highmem.h
+++ b/arch/microblaze/include/asm/highmem.h
@@ -51,22 +51,6 @@ 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_atomic_high_prot(struct page *page, pgprot_t prot);
-static inline void *kmap_atomic_prot(struct page *page, pgprot_t prot)
-{
-       preempt_disable();
-       pagefault_disable();
-       if (!PageHighMem(page))
-               return page_address(page);
-
-       return kmap_atomic_high_prot(page, prot);
-}
-
-static inline void *kmap_atomic_high(struct page *page)
-{
-       return kmap_atomic_high_prot(page, kmap_prot);
-}
-
 #define flush_cache_kmaps()    { flush_icache(); flush_dcache(); }
 
 #endif /* __KERNEL__ */

diff --git a/arch/mips/mm/highmem.c b/arch/mips/mm/highmem.c
index 96a4867..8e87269 100644 (file)
--- a/arch/mips/mm/highmem.c
+++ b/arch/mips/mm/highmem.c
@@ -18,7 +18,7 @@ void kmap_flush_tlb(unsigned long addr)
 }
 EXPORT_SYMBOL(kmap_flush_tlb);
 
-void *kmap_atomic_high(struct page *page)
+void *kmap_atomic_high_prot(struct page *page, pgprot_t prot)
 {
        unsigned long vaddr;
        int idx, type;
@@ -29,12 +29,12 @@ void *kmap_atomic_high(struct page *page)
 #ifdef CONFIG_DEBUG_HIGHMEM
        BUG_ON(!pte_none(*(kmap_pte - idx)));
 #endif
-       set_pte(kmap_pte-idx, mk_pte(page, kmap_prot));
+       set_pte(kmap_pte-idx, mk_pte(page, prot));
        local_flush_tlb_one((unsigned long)vaddr);
 
        return (void*) vaddr;
 }
-EXPORT_SYMBOL(kmap_atomic_high);
+EXPORT_SYMBOL(kmap_atomic_high_prot);
 
 void kunmap_atomic_high(void *kvaddr)
 {

diff --git a/arch/nds32/mm/highmem.c b/arch/nds32/mm/highmem.c
index b11b889..4284cd5 100644 (file)
--- a/arch/nds32/mm/highmem.c
+++ b/arch/nds32/mm/highmem.c
@@ -10,7 +10,7 @@
 #include <asm/fixmap.h>
 #include <asm/tlbflush.h>
 
-void *kmap_atomic_high(struct page *page)
+void *kmap_atomic_high_prot(struct page *page, pgprot_t prot)
 {
        unsigned int idx;
        unsigned long vaddr, pte;
@@ -21,7 +21,7 @@ void *kmap_atomic_high(struct page *page)
 
        idx = type + KM_TYPE_NR * smp_processor_id();
        vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
-       pte = (page_to_pfn(page) << PAGE_SHIFT) | (kmap_prot);
+       pte = (page_to_pfn(page) << PAGE_SHIFT) | prot;
        ptep = pte_offset_kernel(pmd_off_k(vaddr), vaddr);
        set_pte(ptep, pte);
 
@@ -31,7 +31,7 @@ void *kmap_atomic_high(struct page *page)
        __nds32__isb();
        return (void *)vaddr;
 }
-EXPORT_SYMBOL(kmap_atomic_high);
+EXPORT_SYMBOL(kmap_atomic_high_prot);
 
 void kunmap_atomic_high(void *kvaddr)
 {

diff --git a/arch/powerpc/include/asm/highmem.h b/arch/powerpc/include/asm/highmem.h
index ee5de97..8d8ee3f 100644 (file)
--- a/arch/powerpc/include/asm/highmem.h
+++ b/arch/powerpc/include/asm/highmem.h
@@ -59,23 +59,6 @@ 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_atomic_high_prot(struct page *page, pgprot_t prot);
-static inline void *kmap_atomic_prot(struct page *page, pgprot_t prot)
-{
-       preempt_disable();
-       pagefault_disable();
-       if (!PageHighMem(page))
-               return page_address(page);
-
-       return kmap_atomic_high_prot(page, prot);
-}
-
-static inline void *kmap_atomic_high(struct page *page)
-{
-       return kmap_atomic_high_prot(page, kmap_prot);
-}
-
-
 #define flush_cache_kmaps()    flush_cache_all()
 
 #endif /* __KERNEL__ */

diff --git a/arch/sparc/mm/highmem.c b/arch/sparc/mm/highmem.c
index 02e23a6..9309bca 100644 (file)
--- a/arch/sparc/mm/highmem.c
+++ b/arch/sparc/mm/highmem.c
@@ -54,7 +54,7 @@ void __init kmap_init(void)
         kmap_prot = __pgprot(SRMMU_ET_PTE | SRMMU_PRIV | SRMMU_CACHE);
 }
 
-void *kmap_atomic_high(struct page *page)
+void *kmap_atomic_high_prot(struct page *page, pgprot_t prot)
 {
        unsigned long vaddr;
        long idx, type;
@@ -73,7 +73,7 @@ void *kmap_atomic_high(struct page *page)
 #ifdef CONFIG_DEBUG_HIGHMEM
        BUG_ON(!pte_none(*(kmap_pte-idx)));
 #endif
-       set_pte(kmap_pte-idx, mk_pte(page, kmap_prot));
+       set_pte(kmap_pte-idx, mk_pte(page, prot));
 /* XXX Fix - Anton */
 #if 0
        __flush_tlb_one(vaddr);
@@ -83,7 +83,7 @@ void *kmap_atomic_high(struct page *page)
 
        return (void*) vaddr;
 }
-EXPORT_SYMBOL(kmap_atomic_high);
+EXPORT_SYMBOL(kmap_atomic_high_prot);
 
 void kunmap_atomic_high(void *kvaddr)
 {

diff --git a/arch/x86/include/asm/highmem.h b/arch/x86/include/asm/highmem.h
index be66b77..0f420b2 100644 (file)
--- a/arch/x86/include/asm/highmem.h
+++ b/arch/x86/include/asm/highmem.h
@@ -58,20 +58,6 @@ extern unsigned long highstart_pfn, highend_pfn;
 #define PKMAP_NR(virt)  ((virt-PKMAP_BASE) >> PAGE_SHIFT)
 #define PKMAP_ADDR(nr)  (PKMAP_BASE + ((nr) << PAGE_SHIFT))
 
-extern void *kmap_atomic_high_prot(struct page *page, pgprot_t prot);
-static inline void *kmap_atomic_prot(struct page *page, pgprot_t prot)
-{
-       preempt_disable();
-       pagefault_disable();
-       if (!PageHighMem(page))
-               return page_address(page);
-
-       return kmap_atomic_high_prot(page, prot);
-}
-static inline void *kmap_atomic_high(struct page *page)
-{
-       return kmap_atomic_high_prot(page, kmap_prot);
-}
 void *kmap_atomic_pfn(unsigned long pfn);
 void *kmap_atomic_prot_pfn(unsigned long pfn, pgprot_t prot);
 

diff --git a/arch/xtensa/mm/highmem.c b/arch/xtensa/mm/highmem.c
index 50168b0..99b5ad1 100644 (file)
--- a/arch/xtensa/mm/highmem.c
+++ b/arch/xtensa/mm/highmem.c
@@ -37,7 +37,7 @@ static inline enum fixed_addresses kmap_idx(int type, unsigned long color)
                color;
 }
 
-void *kmap_atomic_high(struct page *page)
+void *kmap_atomic_high_prot(struct page *page, pgprot_t prot)
 {
        enum fixed_addresses idx;
        unsigned long vaddr;
@@ -48,11 +48,11 @@ void *kmap_atomic_high(struct page *page)
 #ifdef CONFIG_DEBUG_HIGHMEM
        BUG_ON(!pte_none(*(kmap_pte + idx)));
 #endif
-       set_pte(kmap_pte + idx, mk_pte(page, kmap_prot));
+       set_pte(kmap_pte + idx, mk_pte(page, prot));
 
        return (void *)vaddr;
 }
-EXPORT_SYMBOL(kmap_atomic_high);
+EXPORT_SYMBOL(kmap_atomic_high_prot);
 
 void kunmap_atomic_high(void *kvaddr)
 {

diff --git a/include/linux/highmem.h b/include/linux/highmem.h
index 945b58d..9c559c6 100644 (file)
--- a/include/linux/highmem.h
+++ b/include/linux/highmem.h
@@ -32,7 +32,7 @@ static inline void invalidate_kernel_vmap_range(void *vaddr, int size)
 #include <asm/kmap_types.h>
 
 #ifdef CONFIG_HIGHMEM
-extern void *kmap_atomic_high(struct page *page);
+extern void *kmap_atomic_high_prot(struct page *page, pgprot_t prot);
 extern void kunmap_atomic_high(void *kvaddr);
 #include <asm/highmem.h>
 
@@ -77,14 +77,15 @@ static inline void kunmap(struct page *page)
  * be used in IRQ contexts, so in some (very limited) cases we need
  * it.
  */
-static inline void *kmap_atomic(struct page *page)
+static inline void *kmap_atomic_prot(struct page *page, pgprot_t prot)
 {
        preempt_disable();
        pagefault_disable();
        if (!PageHighMem(page))
                return page_address(page);
-       return kmap_atomic_high(page);
+       return kmap_atomic_high_prot(page, prot);
 }
+#define kmap_atomic(page)      kmap_atomic_prot(page, kmap_prot)
 
 /* declarations for linux/mm/highmem.c */
 unsigned int nr_free_highpages(void);