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[PATCH] remove the syslog interface when printk is disabled

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Attempts to read() from the non-existent dmesg buffer will return zero and
userspace tends to get stuck in a busyloop.

So just remove /dev/kmsg altogether if CONFIG_PRINTK=n.

Signed-off-by: Mike Galbraith <efault@gmx.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Mike Galbraith 2006-12-06 20:37:42 -08:00 committed by Linus Torvalds
parent 44ddc4f567
commit c36264dfb2
3 changed files with 5 additions and 7 deletions
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3
fs/proc/Makefile
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@ -8,8 +8,9 @@ proc-y := nommu.o task_nommu.o
proc-$(CONFIG_MMU) := mmu.o task_mmu.o
proc-y += inode.o root.o base.o generic.o array.o \
kmsg.o proc_tty.o proc_misc.o
proc_tty.o proc_misc.o
proc-$(CONFIG_PROC_KCORE) += kcore.o
proc-$(CONFIG_PROC_VMCORE) += vmcore.o
proc-$(CONFIG_PROC_DEVICETREE) += proc_devtree.o
proc-$(CONFIG_PRINTK) += kmsg.o

2
fs/proc/proc_misc.c
View file

@ -696,9 +696,11 @@ void __init proc_misc_init(void)
proc_symlink("mounts", NULL, "self/mounts");
/* And now for trickier ones */
#ifdef CONFIG_PRINTK
entry = create_proc_entry("kmsg", S_IRUSR, &proc_root);
if (entry)
entry->proc_fops = &proc_kmsg_operations;
#endif
create_seq_entry("devices", 0, &proc_devinfo_operations);
create_seq_entry("cpuinfo", 0, &proc_cpuinfo_operations);
#ifdef CONFIG_BLOCK

7
kernel/printk.c
View file

@ -631,12 +631,7 @@ EXPORT_SYMBOL(vprintk);
asmlinkage long sys_syslog(int type, char __user *buf, int len)
{
return 0;
}
int do_syslog(int type, char __user *buf, int len)
{
return 0;
return -ENOSYS;
}
static void call_console_drivers(unsigned long start, unsigned long end)