Add Kbuild file for SPARC 'make headers_install'

[safe/jmp/linux-2.6] / drivers / char / mem.c

diff --git a/drivers/char/mem.c b/drivers/char/mem.c
index 26d0116..1fa9fa1 100644 (file)
--- a/drivers/char/mem.c
+++ b/drivers/char/mem.c
@@ -27,6 +27,7 @@
 #include <linux/crash_dump.h>
 #include <linux/backing-dev.h>
 #include <linux/bootmem.h>
+#include <linux/pipe_fs_i.h>
 
 #include <asm/uaccess.h>
 #include <asm/io.h>
@@ -88,21 +89,15 @@ static inline int uncached_access(struct file *file, unsigned long addr)
 }
 
 #ifndef ARCH_HAS_VALID_PHYS_ADDR_RANGE
-static inline int valid_phys_addr_range(unsigned long addr, size_t *count)
+static inline int valid_phys_addr_range(unsigned long addr, size_t count)
 {
-       unsigned long end_mem;
-
-       end_mem = __pa(high_memory);
-       if (addr >= end_mem)
+       if (addr + count > __pa(high_memory))
                return 0;
 
-       if (*count > end_mem - addr)
-               *count = end_mem - addr;
-
        return 1;
 }
 
-static inline int valid_mmap_phys_addr_range(unsigned long addr, size_t *size)
+static inline int valid_mmap_phys_addr_range(unsigned long addr, size_t size)
 {
        return 1;
 }
@@ -119,7 +114,7 @@ static ssize_t read_mem(struct file * file, char __user * buf,
        ssize_t read, sz;
        char *ptr;
 
-       if (!valid_phys_addr_range(p, &count))
+       if (!valid_phys_addr_range(p, count))
                return -EFAULT;
        read = 0;
 #ifdef __ARCH_HAS_NO_PAGE_ZERO_MAPPED
@@ -177,7 +172,7 @@ static ssize_t write_mem(struct file * file, const char __user * buf,
        unsigned long copied;
        void *ptr;
 
-       if (!valid_phys_addr_range(p, &count))
+       if (!valid_phys_addr_range(p, count))
                return -EFAULT;
 
        written = 0;
@@ -249,7 +244,7 @@ static int mmap_mem(struct file * file, struct vm_area_struct * vma)
 {
        size_t size = vma->vm_end - vma->vm_start;
 
-       if (!valid_mmap_phys_addr_range(vma->vm_pgoff << PAGE_SHIFT, &size))
+       if (!valid_mmap_phys_addr_range(vma->vm_pgoff << PAGE_SHIFT, size))
                return -EINVAL;
 
        vma->vm_page_prot = phys_mem_access_prot(file, vma->vm_pgoff,
@@ -584,6 +579,18 @@ static ssize_t write_null(struct file * file, const char __user * buf,
        return count;
 }
 
+static int pipe_to_null(struct pipe_inode_info *info, struct pipe_buffer *buf,
+                       struct splice_desc *sd)
+{
+       return sd->len;
+}
+
+static ssize_t splice_write_null(struct pipe_inode_info *pipe,struct file *out,
+                                loff_t *ppos, size_t len, unsigned int flags)
+{
+       return splice_from_pipe(pipe, out, ppos, len, flags, pipe_to_null);
+}
+
 #ifdef CONFIG_MMU
 /*
  * For fun, we are using the MMU for this.
@@ -791,6 +798,7 @@ static struct file_operations null_fops = {
        .llseek         = null_lseek,
        .read           = read_null,
        .write          = write_null,
+       .splice_write   = splice_write_null,
 };
 
 #if defined(CONFIG_ISA) || !defined(__mc68000__)
@@ -905,7 +913,7 @@ static const struct {
        unsigned int            minor;
        char                    *name;
        umode_t                 mode;
-       struct file_operations  *fops;
+       const struct file_operations    *fops;
 } devlist[] = { /* list of minor devices */
        {1, "mem",     S_IRUSR | S_IWUSR | S_IRGRP, &mem_fops},
        {2, "kmem",    S_IRUSR | S_IWUSR | S_IRGRP, &kmem_fops},