diff options
Diffstat (limited to 'drivers/char/mem.c')
| -rw-r--r-- | drivers/char/mem.c | 12 |
1 files changed, 5 insertions, 7 deletions
diff --git a/drivers/char/mem.c b/drivers/char/mem.c index e70860ea9..824ef94e4 100644 --- a/drivers/char/mem.c +++ b/drivers/char/mem.c @@ -5,6 +5,7 @@ * * Added devfs support. * Jan-11-1998, C. Scott Ananian <cananian@alumni.princeton.edu> + * Shared /dev/zero mmaping support, Feb 2000, Kanoj Sarcar <kanoj@sgi.com> */ #include <linux/config.h> @@ -285,8 +286,7 @@ static ssize_t write_kmem(struct file * file, const char * buf, return do_write_mem(file, (void*)p, p, buf, count, ppos); } -#if (!defined(CONFIG_PPC) && !defined(__mc68000__) && !defined(__mips__)) || \ - defined(CONFIG_HAVE_IO_PORTS) +#if (!defined(__mc68000__) && !defined(__mips__)) || defined(CONFIG_HAVE_IO_PORTS) static ssize_t read_port(struct file * file, char * buf, size_t count, loff_t *ppos) { @@ -435,7 +435,7 @@ out: static int mmap_zero(struct file * file, struct vm_area_struct * vma) { if (vma->vm_flags & VM_SHARED) - return -EINVAL; + return map_zero_setup(vma); if (zeromap_page_range(vma->vm_start, vma->vm_end - vma->vm_start, vma->vm_page_prot)) return -EAGAIN; return 0; @@ -515,8 +515,7 @@ static struct file_operations null_fops = { write: write_null, }; -#if (!defined(CONFIG_PPC) && !defined(__mc68000__) && !defined(__mips__)) || \ - defined(CONFIG_HAVE_IO_PORTS) +#if (!defined(__mc68000__) && !defined(__mips__)) || defined(CONFIG_HAVE_IO_PORTS) static struct file_operations port_fops = { llseek: memory_lseek, read: read_port, @@ -550,8 +549,7 @@ static int memory_open(struct inode * inode, struct file * filp) case 3: filp->f_op = &null_fops; break; -#if (!defined(CONFIG_PPC) && !defined(__mc68000__) && !defined(__mips__)) || \ - defined(CONFIG_HAVE_IO_PORTS) +#if (!defined(__mc68000__) && !defined(__mips__)) || defined(CONFIG_HAVE_IO_PORTS) case 4: filp->f_op = &port_fops; break; |