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drivers/char/mem.c: cleanups

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- fix switch statement layout

- fix whitespace stuff

- fix comment layout

- remove unneeded inlining

- use __weak

- remove trailing whitespace

- move uncached_access() inside `#ifndef __HAVE_PHYS_MEM_ACCESS_PROT' - it
  is otherwise unused.

Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Cc: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andrew Morton 2010-03-10 15:21:52 -08:00 committed by Linus Torvalds
parent dcefafb6ac
commit d7d4d849b4
1 changed files with 102 additions and 102 deletions
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204
drivers/char/mem.c
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@ -3,7 +3,7 @@
*
* Copyright (C) 1991, 1992 Linus Torvalds
*
* Added devfs support.
* Added devfs support.
* Jan-11-1998, C. Scott Ananian <cananian@alumni.princeton.edu>
* Shared /dev/zero mmapping support, Feb 2000, Kanoj Sarcar <kanoj@sgi.com>
*/
@ -44,36 +44,6 @@ static inline unsigned long size_inside_page(unsigned long start,
return min(sz, size);
}
/*
* Architectures vary in how they handle caching for addresses
* outside of main memory.
*
*/
static inline int uncached_access(struct file *file, unsigned long addr)
{
#if defined(CONFIG_IA64)
/*
* On ia64, we ignore O_DSYNC because we cannot tolerate memory attribute aliases.
*/
return !(efi_mem_attributes(addr) & EFI_MEMORY_WB);
#elif defined(CONFIG_MIPS)
{
extern int __uncached_access(struct file *file,
unsigned long addr);
return __uncached_access(file, addr);
}
#else
/*
* Accessing memory above the top the kernel knows about or through a file pointer
* that was marked O_DSYNC will be done non-cached.
*/
if (file->f_flags & O_DSYNC)
return 1;
return addr >= __pa(high_memory);
#endif
}
#ifndef ARCH_HAS_VALID_PHYS_ADDR_RANGE
static inline int valid_phys_addr_range(unsigned long addr, size_t count)
{
@ -115,15 +85,15 @@ static inline int range_is_allowed(unsigned long pfn, unsigned long size)
}
#endif
void __attribute__((weak)) unxlate_dev_mem_ptr(unsigned long phys, void *addr)
void __weak unxlate_dev_mem_ptr(unsigned long phys, void *addr)
{
}
/*
* This funcion reads the *physical* memory. The f_pos points directly to the
* memory location.
* This funcion reads the *physical* memory. The f_pos points directly to the
* memory location.
*/
static ssize_t read_mem(struct file * file, char __user * buf,
static ssize_t read_mem(struct file *file, char __user *buf,
size_t count, loff_t *ppos)
{
unsigned long p = *ppos;
@ -140,10 +110,10 @@ static ssize_t read_mem(struct file * file, char __user * buf,
if (sz > 0) {
if (clear_user(buf, sz))
return -EFAULT;
buf += sz;
p += sz;
count -= sz;
read += sz;
buf += sz;
p += sz;
count -= sz;
read += sz;
}
}
#endif
@ -157,9 +127,9 @@ static ssize_t read_mem(struct file * file, char __user * buf,
return -EPERM;
/*
* On ia64 if a page has been mapped somewhere as
* uncached, then it must also be accessed uncached
* by the kernel or data corruption may occur
* On ia64 if a page has been mapped somewhere as uncached, then
* it must also be accessed uncached by the kernel or data
* corruption may occur.
*/
ptr = xlate_dev_mem_ptr(p);
if (!ptr)
@ -180,7 +150,7 @@ static ssize_t read_mem(struct file * file, char __user * buf,
return read;
}
static ssize_t write_mem(struct file * file, const char __user * buf,
static ssize_t write_mem(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
unsigned long p = *ppos;
@ -212,9 +182,9 @@ static ssize_t write_mem(struct file * file, const char __user * buf,
return -EPERM;
/*
* On ia64 if a page has been mapped somewhere as
* uncached, then it must also be accessed uncached
* by the kernel or data corruption may occur
* On ia64 if a page has been mapped somewhere as uncached, then
* it must also be accessed uncached by the kernel or data
* corruption may occur.
*/
ptr = xlate_dev_mem_ptr(p);
if (!ptr) {
@ -242,13 +212,46 @@ static ssize_t write_mem(struct file * file, const char __user * buf,
return written;
}
int __attribute__((weak)) phys_mem_access_prot_allowed(struct file *file,
int __weak phys_mem_access_prot_allowed(struct file *file,
unsigned long pfn, unsigned long size, pgprot_t *vma_prot)
{
return 1;
}
#ifndef __HAVE_PHYS_MEM_ACCESS_PROT
/*
* Architectures vary in how they handle caching for addresses
* outside of main memory.
*
*/
static int uncached_access(struct file *file, unsigned long addr)
{
#if defined(CONFIG_IA64)
/*
* On ia64, we ignore O_DSYNC because we cannot tolerate memory
* attribute aliases.
*/
return !(efi_mem_attributes(addr) & EFI_MEMORY_WB);
#elif defined(CONFIG_MIPS)
{
extern int __uncached_access(struct file *file,
unsigned long addr);
return __uncached_access(file, addr);
}
#else
/*
* Accessing memory above the top the kernel knows about or through a
* file pointer
* that was marked O_DSYNC will be done non-cached.
*/
if (file->f_flags & O_DSYNC)
return 1;
return addr >= __pa(high_memory);
#endif
}
static pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
unsigned long size, pgprot_t vma_prot)
{
@ -294,7 +297,7 @@ static const struct vm_operations_struct mmap_mem_ops = {
#endif
};
static int mmap_mem(struct file * file, struct vm_area_struct * vma)
static int mmap_mem(struct file *file, struct vm_area_struct *vma)
{
size_t size = vma->vm_end - vma->vm_start;
@ -329,7 +332,7 @@ static int mmap_mem(struct file * file, struct vm_area_struct * vma)
}
#ifdef CONFIG_DEVKMEM
static int mmap_kmem(struct file * file, struct vm_area_struct * vma)
static int mmap_kmem(struct file *file, struct vm_area_struct *vma)
{
unsigned long pfn;
@ -337,9 +340,9 @@ static int mmap_kmem(struct file * file, struct vm_area_struct * vma)
pfn = __pa((u64)vma->vm_pgoff << PAGE_SHIFT) >> PAGE_SHIFT;
/*
* RED-PEN: on some architectures there is more mapped memory
* than available in mem_map which pfn_valid checks
* for. Perhaps should add a new macro here.
* RED-PEN: on some architectures there is more mapped memory than
* available in mem_map which pfn_valid checks for. Perhaps should add a
* new macro here.
*
* RED-PEN: vmalloc is not supported right now.
*/
@ -389,7 +392,7 @@ static ssize_t read_oldmem(struct file *file, char __user *buf,
/*
* This function reads the *virtual* memory as seen by the kernel.
*/
static ssize_t read_kmem(struct file *file, char __user *buf,
static ssize_t read_kmem(struct file *file, char __user *buf,
size_t count, loff_t *ppos)
{
unsigned long p = *ppos;
@ -400,8 +403,8 @@ static ssize_t read_kmem(struct file *file, char __user *buf,
read = 0;
if (p < (unsigned long) high_memory) {
low_count = count;
if (count > (unsigned long) high_memory - p)
low_count = (unsigned long) high_memory - p;
if (count > (unsigned long)high_memory - p)
low_count = (unsigned long)high_memory - p;
#ifdef __ARCH_HAS_NO_PAGE_ZERO_MAPPED
/* we don't have page 0 mapped on sparc and m68k.. */
@ -465,9 +468,8 @@ static ssize_t read_kmem(struct file *file, char __user *buf,
}
static inline ssize_t
do_write_kmem(unsigned long p, const char __user *buf,
size_t count, loff_t *ppos)
static ssize_t do_write_kmem(unsigned long p, const char __user *buf,
size_t count, loff_t *ppos)
{
ssize_t written, sz;
unsigned long copied;
@ -491,9 +493,9 @@ do_write_kmem(unsigned long p, const char __user *buf,
sz = size_inside_page(p, count);
/*
* On ia64 if a page has been mapped somewhere as
* uncached, then it must also be accessed uncached
* by the kernel or data corruption may occur
* On ia64 if a page has been mapped somewhere as uncached, then
* it must also be accessed uncached by the kernel or data
* corruption may occur.
*/
ptr = xlate_dev_kmem_ptr((char *)p);
@ -514,11 +516,10 @@ do_write_kmem(unsigned long p, const char __user *buf,
return written;
}
/*
* This function writes to the *virtual* memory as seen by the kernel.
*/
static ssize_t write_kmem(struct file * file, const char __user * buf,
static ssize_t write_kmem(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
unsigned long p = *ppos;
@ -570,17 +571,17 @@ static ssize_t write_kmem(struct file * file, const char __user * buf,
#endif
#ifdef CONFIG_DEVPORT
static ssize_t read_port(struct file * file, char __user * buf,
static ssize_t read_port(struct file *file, char __user *buf,
size_t count, loff_t *ppos)
{
unsigned long i = *ppos;
char __user *tmp = buf;
if (!access_ok(VERIFY_WRITE, buf, count))
return -EFAULT;
return -EFAULT;
while (count-- > 0 && i < 65536) {
if (__put_user(inb(i),tmp) < 0)
return -EFAULT;
if (__put_user(inb(i), tmp) < 0)
return -EFAULT;
i++;
tmp++;
}
@ -588,22 +589,22 @@ static ssize_t read_port(struct file * file, char __user * buf,
return tmp-buf;
}
static ssize_t write_port(struct file * file, const char __user * buf,
static ssize_t write_port(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
unsigned long i = *ppos;
const char __user * tmp = buf;
if (!access_ok(VERIFY_READ,buf,count))
if (!access_ok(VERIFY_READ, buf, count))
return -EFAULT;
while (count-- > 0 && i < 65536) {
char c;
if (__get_user(c, tmp)) {
if (tmp > buf)
break;
return -EFAULT;
return -EFAULT;
}
outb(c,i);
outb(c, i);
i++;
tmp++;
}
@ -612,13 +613,13 @@ static ssize_t write_port(struct file * file, const char __user * buf,
}
#endif
static ssize_t read_null(struct file * file, char __user * buf,
static ssize_t read_null(struct file *file, char __user *buf,
size_t count, loff_t *ppos)
{
return 0;
}
static ssize_t write_null(struct file * file, const char __user * buf,
static ssize_t write_null(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
return count;
@ -630,13 +631,13 @@ static int pipe_to_null(struct pipe_inode_info *info, struct pipe_buffer *buf,
return sd->len;
}
static ssize_t splice_write_null(struct pipe_inode_info *pipe,struct file *out,
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);
}
static ssize_t read_zero(struct file * file, char __user * buf,
static ssize_t read_zero(struct file *file, char __user *buf,
size_t count, loff_t *ppos)
{
size_t written;
@ -667,7 +668,7 @@ static ssize_t read_zero(struct file * file, char __user * buf,
return written ? written : -EFAULT;
}
static int mmap_zero(struct file * file, struct vm_area_struct * vma)
static int mmap_zero(struct file *file, struct vm_area_struct *vma)
{
#ifndef CONFIG_MMU
return -ENOSYS;
@ -677,7 +678,7 @@ static int mmap_zero(struct file * file, struct vm_area_struct * vma)
return 0;
}
static ssize_t write_full(struct file * file, const char __user * buf,
static ssize_t write_full(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
return -ENOSPC;
@ -688,8 +689,7 @@ static ssize_t write_full(struct file * file, const char __user * buf,
* can fopen() both devices with "a" now. This was previously impossible.
* -- SRB.
*/
static loff_t null_lseek(struct file * file, loff_t offset, int orig)
static loff_t null_lseek(struct file *file, loff_t offset, int orig)
{
return file->f_pos = 0;
}
@ -702,31 +702,31 @@ static loff_t null_lseek(struct file * file, loff_t offset, int orig)
* also note that seeking relative to the "end of file" isn't supported:
* it has no meaning, so it returns -EINVAL.
*/
static loff_t memory_lseek(struct file * file, loff_t offset, int orig)
static loff_t memory_lseek(struct file *file, loff_t offset, int orig)
{
loff_t ret;
mutex_lock(&file->f_path.dentry->d_inode->i_mutex);
switch (orig) {
case SEEK_CUR:
offset += file->f_pos;
if ((unsigned long long)offset <
(unsigned long long)file->f_pos) {
ret = -EOVERFLOW;
break;
}
case SEEK_SET:
/* to avoid userland mistaking f_pos=-9 as -EBADF=-9 */
if ((unsigned long long)offset >= ~0xFFFULL) {
ret = -EOVERFLOW;
break;
}
file->f_pos = offset;
ret = file->f_pos;
force_successful_syscall_return();
case SEEK_CUR:
offset += file->f_pos;
if ((unsigned long long)offset <
(unsigned long long)file->f_pos) {
ret = -EOVERFLOW;
break;
default:
ret = -EINVAL;
}
case SEEK_SET:
/* to avoid userland mistaking f_pos=-9 as -EBADF=-9 */
if ((unsigned long long)offset >= ~0xFFFULL) {
ret = -EOVERFLOW;
break;
}
file->f_pos = offset;
ret = file->f_pos;
force_successful_syscall_return();
break;
default:
ret = -EINVAL;
}
mutex_unlock(&file->f_path.dentry->d_inode->i_mutex);
return ret;
@ -810,7 +810,7 @@ static const struct file_operations oldmem_fops = {
};
#endif
static ssize_t kmsg_write(struct file * file, const char __user * buf,
static ssize_t kmsg_write(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
char *tmp;
@ -832,7 +832,7 @@ static ssize_t kmsg_write(struct file * file, const char __user * buf,
}
static const struct file_operations kmsg_fops = {
.write = kmsg_write,
.write = kmsg_write,
};
static const struct memdev {
@ -883,7 +883,7 @@ static int memory_open(struct inode *inode, struct file *filp)
}
static const struct file_operations memory_fops = {
.open = memory_open,
.open = memory_open,
};
static char *mem_devnode(struct device *dev, mode_t *mode)
@ -904,7 +904,7 @@ static int __init chr_dev_init(void)
if (err)
return err;
if (register_chrdev(MEM_MAJOR,"mem",&memory_fops))
if (register_chrdev(MEM_MAJOR, "mem", &memory_fops))
printk("unable to get major %d for memory devs\n", MEM_MAJOR);
mem_class = class_create(THIS_MODULE, "mem");