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| author |   Christian Borntraeger <borntraeger@de.ibm.com> | 2017-11-23 19:26:20 +0100 |
|---|---|---|
| committer |   Martin Schwidefsky <schwidefsky@de.ibm.com> | 2017-11-24 14:28:34 +0100 |
| commit | 860ec7c6e21cecca8c508a66ee211b56d87f5bd7 (patch) | |
| tree | 375847e608aa9dbe1c10abcd1a143a5bbb1c1b98 /arch/s390/kernel | |
| parent | s390: fix alloc_pgste check in init_new_context again (diff) | |
| download | linux-dev-860ec7c6e21cecca8c508a66ee211b56d87f5bd7.tar.xz linux-dev-860ec7c6e21cecca8c508a66ee211b56d87f5bd7.zip | |
s390/debug: use pK for kernel pointers
the s390 debug feature (/sys/kernel/debug/s390dbf/) shows the kernel
pointer of the calling function even for kptr_restrict == 2. Let us
use pK instead of p.
This hides the kernel addresses for kptr_restrict == 2:
root@host $ echo 2 > /proc/sys/kernel/kptr_restrict
root@host $ tail -n1 /sys/kernel/debug/s390dbf/cio_msg/sprintf
00 01511461280:386645 2 - 00 0000000000000000 snsid: device 0.0.3f68: rc=0 3990/e9 3390/0c
root@host $ echo 1 > /proc/sys/kernel/kptr_restrict
root@host $ tail -n1 /sys/kernel/debug/s390dbf/cio_msg/sprintf
00 01511461280:386645 2 - 00 000000000071171c snsid: device 0.0.3f68: rc=0 3990/e9 3390/0c
root@host $ echo 0 > /proc/sys/kernel/kptr_restrict
root@host $ tail -n1 /sys/kernel/debug/s390dbf/cio_msg/sprintf
00 01511461280:386645 2 - 00 000000000071171c snsid: device 0.0.3f68: rc=0 3990/e9 3390/0c
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/kernel')
| -rw-r--r-- | arch/s390/kernel/debug.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/s390/kernel/debug.c b/arch/s390/kernel/debug.c index 58b9e127b615..80e974adb9e8 100644 --- a/arch/s390/kernel/debug.c +++ b/arch/s390/kernel/debug.c @@ -1392,7 +1392,7 @@ int debug_dflt_header_fn(debug_info_t *id, struct debug_view *view, else except_str = "-"; caller = (unsigned long) entry->caller; - rc += sprintf(out_buf, "%02i %011ld:%06lu %1u %1s %02i %p ", + rc += sprintf(out_buf, "%02i %011ld:%06lu %1u %1s %02i %pK ", area, sec, usec, level, except_str, entry->id.fields.cpuid, (void *)caller); return rc; |