#define _LINUX_HIGHMEM_H
#include <linux/fs.h>
+#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/uaccess.h>
+#include <linux/hardirq.h>
#include <asm/cacheflush.h>
#ifndef ARCH_HAS_FLUSH_ANON_PAGE
-static inline void flush_anon_page(struct page *page, unsigned long vmaddr)
+static inline void flush_anon_page(struct vm_area_struct *vma, struct page *page, unsigned long vmaddr)
{
}
#endif
static inline void flush_kernel_dcache_page(struct page *page)
{
}
+static inline void flush_kernel_vmap_range(void *vaddr, int size)
+{
+}
+static inline void invalidate_kernel_vmap_range(void *vaddr, int size)
+{
+}
#endif
-#ifdef CONFIG_HIGHMEM
+#include <asm/kmap_types.h>
+#ifdef CONFIG_HIGHMEM
#include <asm/highmem.h>
/* declarations for linux/mm/highmem.c */
unsigned int nr_free_highpages(void);
extern unsigned long totalhigh_pages;
+void kmap_flush_unused(void);
+
#else /* CONFIG_HIGHMEM */
static inline unsigned int nr_free_highpages(void) { return 0; }
-#define totalhigh_pages 0
+#define totalhigh_pages 0UL
#ifndef ARCH_HAS_KMAP
static inline void *kmap(struct page *page)
return page_address(page);
}
-#define kunmap(page) do { (void) (page); } while (0)
+static inline void kunmap(struct page *page)
+{
+}
+
+static inline void *__kmap_atomic(struct page *page)
+{
+ pagefault_disable();
+ return page_address(page);
+}
+#define kmap_atomic_prot(page, prot) __kmap_atomic(page)
+
+static inline void __kunmap_atomic(void *addr)
+{
+ pagefault_enable();
+}
-#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_pfn(pfn) kmap_atomic(pfn_to_page(pfn))
#define kmap_atomic_to_page(ptr) virt_to_page(ptr)
+
+#define kmap_flush_unused() do {} while(0)
#endif
#endif /* CONFIG_HIGHMEM */
+#if defined(CONFIG_HIGHMEM) || defined(CONFIG_X86_32)
+
+DECLARE_PER_CPU(int, __kmap_atomic_idx);
+
+static inline int kmap_atomic_idx_push(void)
+{
+ int idx = __this_cpu_inc_return(__kmap_atomic_idx) - 1;
+
+#ifdef CONFIG_DEBUG_HIGHMEM
+ WARN_ON_ONCE(in_irq() && !irqs_disabled());
+ BUG_ON(idx > KM_TYPE_NR);
+#endif
+ return idx;
+}
+
+static inline int kmap_atomic_idx(void)
+{
+ return __this_cpu_read(__kmap_atomic_idx) - 1;
+}
+
+static inline void kmap_atomic_idx_pop(void)
+{
+#ifdef CONFIG_DEBUG_HIGHMEM
+ int idx = __this_cpu_dec_return(__kmap_atomic_idx);
+
+ BUG_ON(idx < 0);
+#else
+ __this_cpu_dec(__kmap_atomic_idx);
+#endif
+}
+
+#endif
+
+/*
+ * Make both: kmap_atomic(page, idx) and kmap_atomic(page) work.
+ */
+#define kmap_atomic(page, args...) __kmap_atomic(page)
+
+/*
+ * Prevent people trying to call kunmap_atomic() as if it were kunmap()
+ * kunmap_atomic() should get the return value of kmap_atomic, not the page.
+ */
+#define kunmap_atomic(addr, args...) \
+do { \
+ BUILD_BUG_ON(__same_type((addr), struct page *)); \
+ __kunmap_atomic(addr); \
+} while (0)
+
/* when CONFIG_HIGHMEM is not set these will be plain clear/copy_page */
+#ifndef clear_user_highpage
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();
}
+#endif
#ifndef __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
+/**
+ * __alloc_zeroed_user_highpage - Allocate a zeroed HIGHMEM page for a VMA with caller-specified movable GFP flags
+ * @movableflags: The GFP flags related to the pages future ability to move like __GFP_MOVABLE
+ * @vma: The VMA the page is to be allocated for
+ * @vaddr: The virtual address the page will be inserted into
+ *
+ * This function will allocate a page for a VMA but the caller is expected
+ * to specify via movableflags whether the page will be movable in the
+ * future or not
+ *
+ * An architecture may override this function by defining
+ * __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE and providing their own
+ * implementation.
+ */
static inline struct page *
-alloc_zeroed_user_highpage(struct vm_area_struct *vma, unsigned long vaddr)
+__alloc_zeroed_user_highpage(gfp_t movableflags,
+ struct vm_area_struct *vma,
+ unsigned long vaddr)
{
- struct page *page = alloc_page_vma(GFP_HIGHUSER, vma, vaddr);
+ struct page *page = alloc_page_vma(GFP_HIGHUSER | movableflags,
+ vma, vaddr);
if (page)
clear_user_highpage(page, vaddr);
}
#endif
+/**
+ * alloc_zeroed_user_highpage_movable - Allocate a zeroed HIGHMEM page for a VMA that the caller knows can move
+ * @vma: The VMA the page is to be allocated for
+ * @vaddr: The virtual address the page will be inserted into
+ *
+ * This function will allocate a page for a VMA that the caller knows will
+ * be able to migrate in the future using move_pages() or reclaimed
+ */
+static inline struct page *
+alloc_zeroed_user_highpage_movable(struct vm_area_struct *vma,
+ unsigned long vaddr)
+{
+ return __alloc_zeroed_user_highpage(__GFP_MOVABLE, vma, vaddr);
+}
+
static inline void clear_highpage(struct page *page)
{
void *kaddr = kmap_atomic(page, KM_USER0);
kunmap_atomic(kaddr, KM_USER0);
}
-/*
- * Same but also flushes aliased cache contents to RAM.
- */
-static inline void memclear_highpage_flush(struct page *page, unsigned int offset, unsigned int size)
+static inline void zero_user_segments(struct page *page,
+ unsigned start1, unsigned end1,
+ unsigned start2, unsigned end2)
{
- void *kaddr;
+ void *kaddr = kmap_atomic(page, KM_USER0);
- BUG_ON(offset + size > PAGE_SIZE);
+ BUG_ON(end1 > PAGE_SIZE || end2 > PAGE_SIZE);
+
+ if (end1 > start1)
+ memset(kaddr + start1, 0, end1 - start1);
+
+ if (end2 > start2)
+ memset(kaddr + start2, 0, end2 - start2);
- kaddr = kmap_atomic(page, KM_USER0);
- memset((char *)kaddr + offset, 0, size);
- flush_dcache_page(page);
kunmap_atomic(kaddr, KM_USER0);
+ flush_dcache_page(page);
}
-static inline void copy_user_highpage(struct page *to, struct page *from, unsigned long vaddr)
+static inline void zero_user_segment(struct page *page,
+ unsigned start, unsigned end)
+{
+ zero_user_segments(page, start, end, 0, 0);
+}
+
+static inline void zero_user(struct page *page,
+ unsigned start, unsigned size)
+{
+ zero_user_segments(page, start, start + size, 0, 0);
+}
+
+static inline void __deprecated memclear_highpage_flush(struct page *page,
+ unsigned int offset, unsigned int size)
+{
+ zero_user(page, offset, size);
+}
+
+#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;
vfrom = kmap_atomic(from, KM_USER0);
vto = kmap_atomic(to, KM_USER1);
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();
+ kunmap_atomic(vfrom, KM_USER0);
}
+#endif
+
static inline void copy_highpage(struct page *to, struct page *from)
{
char *vfrom, *vto;
vfrom = kmap_atomic(from, KM_USER0);
vto = kmap_atomic(to, KM_USER1);
copy_page(vto, vfrom);
- kunmap_atomic(vfrom, KM_USER0);
kunmap_atomic(vto, KM_USER1);
+ kunmap_atomic(vfrom, KM_USER0);
}
#endif /* _LINUX_HIGHMEM_H */
Code Review / linux-2.6.git / blobdiff