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255019537c
If an expedited RCU CPU stall ends just at the stall-warning timeout, the current code will print an expedited stall-warning message, but one that doesn't identify any CPUs or tasks causing the stall. This is most likely to happen for short-timeout stalls, for example, the 20-millisecond timeouts that are sometimes used for small embedded devices. Needless to say, these semi-empty stall-warning messages can be rather confusing. One option would be to suppress the stall-warning message entirely in this case, but the near-miss information can be quite valuable. Detect this race condition and emits a "INFO: Expedited stall ended before state dump start" message to clarify matters. [boqun: Apply feedback from Borislav] Reported-by: Borislav Petkov <bp@alien8.de> Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Acked-by: Borislav Petkov (AMD) <bp@alien8.de> Signed-off-by: Boqun Feng <boqun.feng@gmail.com> |
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| .. | ||
| Kconfig | ||
| Kconfig.debug | ||
| Makefile | ||
| rcu_segcblist.c | ||
| rcu_segcblist.h | ||
| rcu.h | ||
| rcuscale.c | ||
| rcutorture.c | ||
| refscale.c | ||
| srcutiny.c | ||
| srcutree.c | ||
| sync.c | ||
| tasks.h | ||
| tiny.c | ||
| tree_exp.h | ||
| tree_nocb.h | ||
| tree_plugin.h | ||
| tree_stall.h | ||
| tree.c | ||
| tree.h | ||
| update.c | ||