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| author | Peter Zijlstra <peterz@infradead.org> | 2015-02-11 15:01:13 +1030 |
|---|---|---|
| committer | Rusty Russell <rusty@rustcorp.com.au> | 2015-02-11 15:02:04 +1030 |
| commit | d64810f56147b53e92228c31442e925576314aa2 (patch) | |
| tree | 9e9233d0ee22b58edb952cda75dc429d215f79bf /kernel/module.c | |
| parent | ab92ebbb8e10d402f4fe73c6b3d85be72614f1fa (diff) | |
| download | lwn-d64810f56147b53e92228c31442e925576314aa2.tar.gz lwn-d64810f56147b53e92228c31442e925576314aa2.zip | |
module: Annotate nested sleep in resolve_symbol()
Because wait_event() loops are safe vs spurious wakeups we can allow the
occasional sleep -- which ends up being very similar.
Reported-by: Dave Jones <davej@codemonkey.org.uk>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Dave Jones <davej@codemonkey.org.uk>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'kernel/module.c')
| -rw-r--r-- | kernel/module.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/kernel/module.c b/kernel/module.c index 2461370813b3..d7a92682fba3 100644 --- a/kernel/module.c +++ b/kernel/module.c @@ -1225,6 +1225,12 @@ static const struct kernel_symbol *resolve_symbol(struct module *mod, const unsigned long *crc; int err; + /* + * The module_mutex should not be a heavily contended lock; + * if we get the occasional sleep here, we'll go an extra iteration + * in the wait_event_interruptible(), which is harmless. + */ + sched_annotate_sleep(); mutex_lock(&module_mutex); sym = find_symbol(name, &owner, &crc, !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true); |