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sysfs: remove "last sysfs file:" line from the oops messages 

On some arches (x86, sh, arm, unicore, powerpc) the oops message would
print out the last sysfs file accessed.

This was very useful in finding a number of sysfs and driver core bugs
in the 2.5 and early 2.6 development days, but it has been a number of
years since this file has actually helped in debugging anything that
couldn't also be trivially determined from the stack traceback.

So it's time to delete the line.  This is good as we need all the space
we can get for oops messages at times on consoles.

Acked-by: Phil Carmody <ext-phil.2.carmody@nokia.com>
Acked-by: Ingo Molnar <mingo@elte.hu>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Greg Kroah-Hartman 2011-05-12 16:01:02 -07:00
parent a236c71766
commit 82a3242e11
7 changed files with 0 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch/arm/kernel/traps.c
View File

@ -234,7 +234,6 @@ static int __die(const char *str, int err, struct thread_info *thread, struct pt
printk(KERN_EMERG "Internal error: %s: %x [#%d]" S_PREEMPT S_SMP "\n",
str, err, ++die_counter);
sysfs_printk_last_file();
/* trap and error numbers are mostly meaningless on ARM */
ret = notify_die(DIE_OOPS, str, regs, err, tsk->thread.trap_no, SIGSEGV);

1
arch/powerpc/kernel/traps.c
View File

@ -143,7 +143,6 @@ int die(const char *str, struct pt_regs *regs, long err)
#endif
printk("%s\n", ppc_md.name ? ppc_md.name : "");
sysfs_printk_last_file();
if (notify_die(DIE_OOPS, str, regs, err, 255,
SIGSEGV) == NOTIFY_STOP)
return 1;

1
arch/sh/kernel/traps_32.c
View File

@ -87,7 +87,6 @@ void die(const char * str, struct pt_regs * regs, long err)
bust_spinlocks(1);
printk("%s: %04lx [#%d]\n", str, err & 0xffff, ++die_counter);
sysfs_printk_last_file();
print_modules();
show_regs(regs);

1
arch/unicore32/kernel/traps.c
View File

@ -192,7 +192,6 @@ static int __die(const char *str, int err, struct thread_info *thread,
printk(KERN_EMERG "Internal error: %s: %x [#%d]\n",
str, err, ++die_counter);
sysfs_printk_last_file();
/* trap and error numbers are mostly meaningless on UniCore */
ret = notify_die(DIE_OOPS, str, regs, err, tsk->thread.trap_no, \

1
arch/x86/kernel/dumpstack.c
View File

@ -279,7 +279,6 @@ int __kprobes __die(const char *str, struct pt_regs *regs, long err)
printk("DEBUG_PAGEALLOC");
#endif
printk("\n");
sysfs_printk_last_file();
if (notify_die(DIE_OOPS, str, regs, err,
current->thread.trap_no, SIGSEGV) == NOTIFY_STOP)
return 1;

12
fs/sysfs/file.c
View File

@ -24,13 +24,6 @@
#include "sysfs.h"
/* used in crash dumps to help with debugging */
static char last_sysfs_file[PATH_MAX];
void sysfs_printk_last_file(void)
{
printk(KERN_EMERG "last sysfs file: %s\n", last_sysfs_file);
}
/*
* There's one sysfs_buffer for each open file and one
* sysfs_open_dirent for each sysfs_dirent with one or more open
@ -337,11 +330,6 @@ static int sysfs_open_file(struct inode *inode, struct file *file)
struct sysfs_buffer *buffer;
const struct sysfs_ops *ops;
int error = -EACCES;
char *p;
p = d_path(&file->f_path, last_sysfs_file, sizeof(last_sysfs_file));
if (!IS_ERR(p))
memmove(last_sysfs_file, p, strlen(p) + 1);
/* need attr_sd for attr and ops, its parent for kobj */
if (!sysfs_get_active(attr_sd))

5
include/linux/sysfs.h
View File

@ -176,7 +176,6 @@ struct sysfs_dirent *sysfs_get_dirent(struct sysfs_dirent *parent_sd,
const unsigned char *name);
struct sysfs_dirent *sysfs_get(struct sysfs_dirent *sd);
void sysfs_put(struct sysfs_dirent *sd);
void sysfs_printk_last_file(void);
/* Called to clear a ns tag when it is no longer valid */
void sysfs_exit_ns(enum kobj_ns_type type, const void *tag);
@ -348,10 +347,6 @@ static inline int __must_check sysfs_init(void)
return 0;
}
static inline void sysfs_printk_last_file(void)
{
}
#endif /* CONFIG_SYSFS */
#endif /* _SYSFS_H_ */