linux/arch/m68k/kernel/bootinfo_proc.c
Alexey Dobriyan 97a32539b9 proc: convert everything to "struct proc_ops"
The most notable change is DEFINE_SHOW_ATTRIBUTE macro split in
seq_file.h.

Conversion rule is:

	llseek		=> proc_lseek
	unlocked_ioctl	=> proc_ioctl

	xxx		=> proc_xxx

	delete ".owner = THIS_MODULE" line

[akpm@linux-foundation.org: fix drivers/isdn/capi/kcapi_proc.c]
[sfr@canb.auug.org.au: fix kernel/sched/psi.c]
  Link: http://lkml.kernel.org/r/20200122180545.36222f50@canb.auug.org.au
Link: http://lkml.kernel.org/r/20191225172546.GB13378@avx2
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2020-02-04 03:05:26 +00:00

80 lines
1.7 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* Based on arch/arm/kernel/atags_proc.c
*/
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/printk.h>
#include <linux/proc_fs.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <asm/bootinfo.h>
#include <asm/byteorder.h>
static char bootinfo_tmp[1536] __initdata;
static void *bootinfo_copy;
static size_t bootinfo_size;
static ssize_t bootinfo_read(struct file *file, char __user *buf,
size_t count, loff_t *ppos)
{
return simple_read_from_buffer(buf, count, ppos, bootinfo_copy,
bootinfo_size);
}
static const struct proc_ops bootinfo_proc_ops = {
.proc_read = bootinfo_read,
.proc_lseek = default_llseek,
};
void __init save_bootinfo(const struct bi_record *bi)
{
const void *start = bi;
size_t size = sizeof(bi->tag);
while (be16_to_cpu(bi->tag) != BI_LAST) {
uint16_t n = be16_to_cpu(bi->size);
size += n;
bi = (struct bi_record *)((unsigned long)bi + n);
}
if (size > sizeof(bootinfo_tmp)) {
pr_err("Cannot save %zu bytes of bootinfo\n", size);
return;
}
pr_info("Saving %zu bytes of bootinfo\n", size);
memcpy(bootinfo_tmp, start, size);
bootinfo_size = size;
}
static int __init init_bootinfo_procfs(void)
{
/*
* This cannot go into save_bootinfo() because kmalloc and proc don't
* work yet when it is called.
*/
struct proc_dir_entry *pde;
if (!bootinfo_size)
return -EINVAL;
bootinfo_copy = kmemdup(bootinfo_tmp, bootinfo_size, GFP_KERNEL);
if (!bootinfo_copy)
return -ENOMEM;
pde = proc_create_data("bootinfo", 0400, NULL, &bootinfo_proc_ops, NULL);
if (!pde) {
kfree(bootinfo_copy);
return -ENOMEM;
}
return 0;
}
arch_initcall(init_bootinfo_procfs);