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| author | Daniel Thompson <daniel.thompson@linaro.org> | 2014-11-11 16:31:53 +0100 |
|---|---|---|
| committer | Jason Wessel <jason.wessel@windriver.com> | 2014-11-11 16:31:53 +0100 |
| commit | a1465d2f396e416a0049332b20fca5977384b9f5 (patch) | |
| tree | 6f8d42833a2f4d06a047d75cca5209d28b7c5986 /kernel/debug/kdb/kdb_debugger.c | |
| parent | kdb: Allow access to sensitive commands to be restricted by default (diff) | |
| download | linux-a1465d2f396e416a0049332b20fca5977384b9f5.tar.xz linux-a1465d2f396e416a0049332b20fca5977384b9f5.zip | |
kgdb: timeout if secondary CPUs ignore the roundup
Currently if an active CPU fails to respond to a roundup request the CPU
that requested the roundup will become stuck. This needlessly reduces the
robustness of the debugger.
This patch introduces a timeout allowing the system state to be examined
even when the system contains unresponsive processors. It also modifies
kdb's cpu command to make it censor attempts to switch to unresponsive
processors and to report their state as (D)ead.
Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Jason Wessel <jason.wessel@windriver.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
Diffstat (limited to 'kernel/debug/kdb/kdb_debugger.c')
| -rw-r--r-- | kernel/debug/kdb/kdb_debugger.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/kernel/debug/kdb/kdb_debugger.c b/kernel/debug/kdb/kdb_debugger.c index 8859ca34dcfe..15e1a7af5dd0 100644 --- a/kernel/debug/kdb/kdb_debugger.c +++ b/kernel/debug/kdb/kdb_debugger.c @@ -129,6 +129,10 @@ int kdb_stub(struct kgdb_state *ks) ks->pass_exception = 1; KDB_FLAG_SET(CATASTROPHIC); } + /* set CATASTROPHIC if the system contains unresponsive processors */ + for_each_online_cpu(i) + if (!kgdb_info[i].enter_kgdb) + KDB_FLAG_SET(CATASTROPHIC); if (KDB_STATE(SSBPT) && reason == KDB_REASON_SSTEP) { KDB_STATE_CLEAR(SSBPT); KDB_STATE_CLEAR(DOING_SS); |