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kdb: use correct pointer when 'btc' calls 'btt' 

On a powerpc 8xx, 'btc' fails as follows:

Entering kdb (current=0x(ptrval), pid 282) due to Keyboard Entry
kdb> btc
btc: cpu status: Currently on cpu 0
Available cpus: 0
kdb_getarea: Bad address 0x0

when booting the kernel with 'debug_boot_weak_hash', it fails as well

Entering kdb (current=0xba99ad80, pid 284) due to Keyboard Entry
kdb> btc
btc: cpu status: Currently on cpu 0
Available cpus: 0
kdb_getarea: Bad address 0xba99ad80

On other platforms, Oopses have been observed too, see
https://github.com/linuxppc/linux/issues/139

This is due to btc calling 'btt' with %p pointer as an argument.

This patch replaces %p by %px to get the real pointer value as
expected by 'btt'

Fixes: ad67b74d24 ("printk: hash addresses printed with %p")
Cc: <stable@vger.kernel.org>
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>
This commit is contained in:
Christophe Leroy 2018-09-27 17:17:49 +00:00 committed by Daniel Thompson
parent ccda4af0f4
commit dded2e1592
1 changed files with 2 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
kernel/debug/kdb/kdb_bt.c
View File

@ -179,14 +179,14 @@ kdb_bt(int argc, const char **argv)
kdb_printf("no process for cpu %ld\n", cpu); kdb_printf("no process for cpu %ld\n", cpu);
return 0; return 0;
} }
sprintf(buf, "btt 0x%p\n", KDB_TSK(cpu)); sprintf(buf, "btt 0x%px\n", KDB_TSK(cpu));
kdb_parse(buf); kdb_parse(buf);
return 0; return 0;
} }
kdb_printf("btc: cpu status: "); kdb_printf("btc: cpu status: ");
kdb_parse("cpu\n"); kdb_parse("cpu\n");
for_each_online_cpu(cpu) { for_each_online_cpu(cpu) {
sprintf(buf, "btt 0x%p\n", KDB_TSK(cpu)); sprintf(buf, "btt 0x%px\n", KDB_TSK(cpu));
kdb_parse(buf); kdb_parse(buf);
touch_nmi_watchdog(); touch_nmi_watchdog();
} }