[Xen-merge] [PATCH 07/23] highmem subarch headers

[Chris Wright <chrisw@xxxxxxxx>]

--- linux-2.6.12-xen0-arch.orig/include/asm-i386/highmem.h
+++ linux-2.6.12-xen0-arch/include/asm-i386/highmem.h
@@ -69,9 +69,13 @@ extern void FASTCALL(kunmap_high(struct 
 void *kmap(struct page *page);
 void kunmap(struct page *page);
 void *kmap_atomic(struct page *page, enum km_type type);
+void *__kmap_atomic(struct page *page, enum km_type type, pgprot_t prot);
 void kunmap_atomic(void *kvaddr, enum km_type type);
 struct page *kmap_atomic_to_page(void *ptr);
 
+/* for kmap_atomic_pte */
+#include <mach_highmem.h>
+
 #define flush_cache_kmaps()    do { } while (0)
 
 #endif /* __KERNEL__ */
--- /dev/null
+++ linux-2.6.12-xen0-arch/include/asm-i386/mach-default/mach_highmem.h
@@ -0,0 +1,6 @@
+#ifndef __ASM_MACH_HIGHEMEM_H
+#define __ASM_MACH_HIGHEMEM_H
+
+#define kmap_atomic_pte(_p,_t) kmap_atomic(_p,_t)
+
+#endif
--- linux-2.6.12-xen0-arch.orig/arch/i386/mm/highmem.c
+++ linux-2.6.12-xen0-arch/arch/i386/mm/highmem.c
@@ -25,7 +25,7 @@ void kunmap(struct page *page)
  * 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, enum km_type type)
+void *__kmap_atomic(struct page *page, enum km_type type, pgprot_t prot)
 {
        enum fixed_addresses idx;
        unsigned long vaddr;
@@ -41,12 +41,17 @@ void *kmap_atomic(struct page *page, enu
        if (!pte_none(*(kmap_pte-idx)))
                BUG();
 #endif
-       set_pte(kmap_pte-idx, mk_pte(page, kmap_prot));
+       set_pte(kmap_pte-idx, mk_pte(page, prot));
        __flush_tlb_one(vaddr);
 
        return (void*) vaddr;
 }
 
+void *kmap_atomic(struct page *page, enum km_type type)
+{
+       return __kmap_atomic(page, type, kmap_prot);
+}
+
 void kunmap_atomic(void *kvaddr, enum km_type type)
 {
 #ifdef CONFIG_DEBUG_HIGHMEM
--- linux-2.6.12-xen0/include/asm-i386/mach-xen/mach_highmem.h  1969-12-31 
16:00:00.000000000 -0800
+++ linux-2.6.12-xen0-arch/include/asm-i386/mach-xen/mach_highmem.h     
2005-07-30 10:56:00.000000000 -0700
@@ -0,0 +1,10 @@
+#ifndef __ASM_MACH_HIGHEMEM_H
+#define __ASM_MACH_HIGHEMEM_H
+
+/* Same as kmap_atomic but with PAGE_KERNEL_RO page protection. */
+static inline void *kmap_atomic_pte(struct page *page, enum km_type type)
+{
+       return __kmap_atomic(page, type, PAGE_KERNEL_RO);
+}
+
+#endif

--


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