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

commit dded2e159208a9edc21dd5c5f583afa28d378d39 upstream.

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: ad67b74d2469 ("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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/kernel/debug/kdb/kdb_bt.c b/kernel/debug/kdb/kdb_bt.c
index 6ad4a9fcbd6f7012ca577070455bec9a1cd03e57..7921ae4fca8de92513fb5b71cbc36fd96ed0e04f 100644 (file)
--- a/kernel/debug/kdb/kdb_bt.c
+++ b/kernel/debug/kdb/kdb_bt.c
@@ -179,14 +179,14 @@ kdb_bt(int argc, const char **argv)
                                kdb_printf("no process for cpu %ld\n", cpu);
                                return 0;
                        }
-                       sprintf(buf, "btt 0x%p\n", KDB_TSK(cpu));
+                       sprintf(buf, "btt 0x%px\n", KDB_TSK(cpu));
                        kdb_parse(buf);
                        return 0;
                }
                kdb_printf("btc: cpu status: ");
                kdb_parse("cpu\n");
                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);
                        touch_nmi_watchdog();
                }