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Symbolic macros are unintuitive and hard to read, whereas octal constants are much easier to interpret. Replace macros for the basic permission flags (user/group/other read/write/execute) with numeric constants instead, across the whole powerpc tree. Introducing a significant number of changes across the tree for no runtime benefit isn't exactly desirable, but so long as these macros are still used in the tree people will keep sending patches that add them. Not only are they hard to parse at a glance, there are multiple ways of coming to the same value (as you can see with 0444 and 0644 in this patch) which hurts readability. Signed-off-by: Russell Currey <ruscur@russell.cc> Reviewed-by: Cyril Bur <cyrilbur@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
107 lines
2.7 KiB
C
107 lines
2.7 KiB
C
/*
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* Copyright (C) 2001 Mike Corrigan & Dave Engebretsen IBM Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/init.h>
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#include <linux/mm.h>
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#include <linux/proc_fs.h>
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#include <linux/kernel.h>
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#include <asm/machdep.h>
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#include <asm/vdso_datapage.h>
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#include <asm/rtas.h>
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#include <linux/uaccess.h>
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#include <asm/prom.h>
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#ifdef CONFIG_PPC64
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static loff_t page_map_seek(struct file *file, loff_t off, int whence)
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{
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return fixed_size_llseek(file, off, whence, PAGE_SIZE);
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}
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static ssize_t page_map_read( struct file *file, char __user *buf, size_t nbytes,
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loff_t *ppos)
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{
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return simple_read_from_buffer(buf, nbytes, ppos,
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PDE_DATA(file_inode(file)), PAGE_SIZE);
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}
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static int page_map_mmap( struct file *file, struct vm_area_struct *vma )
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{
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if ((vma->vm_end - vma->vm_start) > PAGE_SIZE)
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return -EINVAL;
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remap_pfn_range(vma, vma->vm_start,
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__pa(PDE_DATA(file_inode(file))) >> PAGE_SHIFT,
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PAGE_SIZE, vma->vm_page_prot);
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return 0;
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}
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static const struct file_operations page_map_fops = {
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.llseek = page_map_seek,
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.read = page_map_read,
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.mmap = page_map_mmap
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};
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static int __init proc_ppc64_init(void)
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{
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struct proc_dir_entry *pde;
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pde = proc_create_data("powerpc/systemcfg", S_IFREG | 0444, NULL,
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&page_map_fops, vdso_data);
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if (!pde)
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return 1;
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proc_set_size(pde, PAGE_SIZE);
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return 0;
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}
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__initcall(proc_ppc64_init);
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#endif /* CONFIG_PPC64 */
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/*
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* Create the ppc64 and ppc64/rtas directories early. This allows us to
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* assume that they have been previously created in drivers.
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*/
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static int __init proc_ppc64_create(void)
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{
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struct proc_dir_entry *root;
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root = proc_mkdir("powerpc", NULL);
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if (!root)
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return 1;
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#ifdef CONFIG_PPC64
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if (!proc_symlink("ppc64", NULL, "powerpc"))
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pr_err("Failed to create link /proc/ppc64 -> /proc/powerpc\n");
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#endif
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if (!of_find_node_by_path("/rtas"))
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return 0;
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if (!proc_mkdir("rtas", root))
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return 1;
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if (!proc_symlink("rtas", NULL, "powerpc/rtas"))
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return 1;
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return 0;
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}
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core_initcall(proc_ppc64_create);
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