X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=include%2Flinux%2Fhighmem.h;h=8941f1283df88634f4218543fcd1ba9617e621a4;hb=refs%2Fheads%2Fvserver;hp=232d8fdb557c85723bc9fa41ad5e3b68f3b46230;hpb=5273a3df6485dc2ad6aa7ddd441b9a21970f003b;p=linux-2.6.git

diff --git a/include/linux/highmem.h b/include/linux/highmem.h
index 232d8fdb5..8941f1283 100644
--- a/include/linux/highmem.h
+++ b/include/linux/highmem.h
@@ -1,25 +1,45 @@
 #ifndef _LINUX_HIGHMEM_H
 #define _LINUX_HIGHMEM_H
 
-#include <linux/config.h>
 #include <linux/fs.h>
 #include <linux/mm.h>
+#include <linux/uaccess.h>
 
 #include <asm/cacheflush.h>
 
-#ifdef CONFIG_HIGHMEM
+#ifndef ARCH_HAS_FLUSH_ANON_PAGE
+static inline void flush_anon_page(struct vm_area_struct *vma, struct page *page, unsigned long vmaddr)
+{
+}
+#endif
+
+#ifndef ARCH_HAS_FLUSH_KERNEL_DCACHE_PAGE
+static inline void flush_kernel_dcache_page(struct page *page)
+{
+}
+#endif
 
-extern struct page *highmem_start_page;
+#ifdef CONFIG_HIGHMEM
 
 #include <asm/highmem.h>
 
 /* declarations for linux/mm/highmem.c */
 unsigned int nr_free_highpages(void);
+extern unsigned long totalhigh_pages;
+#ifdef CONFIG_XEN
+void kmap_flush_unused(void);
+#endif
 
 #else /* CONFIG_HIGHMEM */
 
 static inline unsigned int nr_free_highpages(void) { return 0; }
+#ifdef CONFIG_XEN
+static inline void kmap_flush_unused(void) { }
+#endif
+
+#define totalhigh_pages 0
 
+#ifndef ARCH_HAS_KMAP
 static inline void *kmap(struct page *page)
 {
 	might_sleep();
@@ -28,9 +48,12 @@ static inline void *kmap(struct page *page)
 
 #define kunmap(page) do { (void) (page); } while (0)
 
-#define kmap_atomic(page, idx)		page_address(page)
-#define kunmap_atomic(addr, idx)	do { } while (0)
+#define kmap_atomic(page, idx) \
+	({ pagefault_disable(); page_address(page); })
+#define kunmap_atomic(addr, idx)	do { pagefault_enable(); } while (0)
+#define kmap_atomic_pfn(pfn, idx)	kmap_atomic(pfn_to_page(pfn), (idx))
 #define kmap_atomic_to_page(ptr)	virt_to_page(ptr)
+#endif
 
 #endif /* CONFIG_HIGHMEM */
 
@@ -40,8 +63,23 @@ static inline void clear_user_highpage(struct page *page, unsigned long vaddr)
 	void *addr = kmap_atomic(page, KM_USER0);
 	clear_user_page(addr, vaddr, page);
 	kunmap_atomic(addr, KM_USER0);
+	/* Make sure this page is cleared on other CPU's too before using it */
+	smp_wmb();
 }
 
+#ifndef __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
+static inline struct page *
+alloc_zeroed_user_highpage(struct vm_area_struct *vma, unsigned long vaddr)
+{
+	struct page *page = alloc_page_vma(GFP_HIGHUSER, vma, vaddr);
+
+	if (page)
+		clear_user_highpage(page, vaddr);
+
+	return page;
+}
+#endif
+
 static inline void clear_highpage(struct page *page)
 {
 	void *kaddr = kmap_atomic(page, KM_USER0);
@@ -64,7 +102,10 @@ static inline void memclear_highpage_flush(struct page *page, unsigned int offse
 	kunmap_atomic(kaddr, KM_USER0);
 }
 
-static inline void copy_user_highpage(struct page *to, struct page *from, unsigned long vaddr)
+#ifndef __HAVE_ARCH_COPY_USER_HIGHPAGE
+
+static inline void copy_user_highpage(struct page *to, struct page *from,
+	unsigned long vaddr, struct vm_area_struct *vma)
 {
 	char *vfrom, *vto;
 
@@ -73,8 +114,12 @@ static inline void copy_user_highpage(struct page *to, struct page *from, unsign
 	copy_user_page(vto, vfrom, vaddr, to);
 	kunmap_atomic(vfrom, KM_USER0);
 	kunmap_atomic(vto, KM_USER1);
+	/* Make sure this page is cleared on other CPU's too before using it */
+	smp_wmb();
 }
 
+#endif
+
 static inline void copy_highpage(struct page *to, struct page *from)
 {
 	char *vfrom, *vto;