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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2014-01-29 19:40:27 +0400 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2014-02-23 21:01:04 +0400 |
| commit | f67a33561e6e5463b548219df98130da95f2e4a7 (patch) | |
| tree | 6cdbf7152900045acb4f0f9d5426f995adf0ba66 /kernel/torture.c | |
| parent | c2884de38e01134ae040d55aa5644049d1bb850f (diff) | |
| download | linux-f67a33561e6e5463b548219df98130da95f2e4a7.tar.xz | |
rcutorture: Abstract torture_shutdown_absorb()
Because handling races between rmmod and normal shutdown is not specific
to rcutorture, this commit renames rcutorture_shutdown_absorb() to
torture_shutdown_absorb() and pulls it out into then kernel/torture.c
module. This implies pulling the fullstop mechanism into kernel/torture.c
as well.
The exporting of fullstop and fullstop_mutex is ugly and must die.
And it does in fact die in later commits that introduce higher-level
APIs that encapsulate both of these variables.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>`
Diffstat (limited to 'kernel/torture.c')
| -rw-r--r-- | kernel/torture.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/kernel/torture.c b/kernel/torture.c index c82c70f7828e..f05042036ae8 100644 --- a/kernel/torture.c +++ b/kernel/torture.c @@ -49,6 +49,11 @@ MODULE_LICENSE("GPL"); MODULE_AUTHOR("Paul E. McKenney <paulmck@us.ibm.com>"); +int fullstop = FULLSTOP_RMMOD; +EXPORT_SYMBOL_GPL(fullstop); +DEFINE_MUTEX(fullstop_mutex); +EXPORT_SYMBOL_GPL(fullstop_mutex); + #define TORTURE_RANDOM_MULT 39916801 /* prime */ #define TORTURE_RANDOM_ADD 479001701 /* prime */ #define TORTURE_RANDOM_REFRESH 10000 @@ -69,3 +74,18 @@ torture_random(struct torture_random_state *trsp) return swahw32(trsp->trs_state); } EXPORT_SYMBOL_GPL(torture_random); + +/* + * Absorb kthreads into a kernel function that won't return, so that + * they won't ever access module text or data again. + */ +void torture_shutdown_absorb(const char *title) +{ + while (ACCESS_ONCE(fullstop) == FULLSTOP_SHUTDOWN) { + pr_notice( + "torture thread %s parking due to system shutdown\n", + title); + schedule_timeout_uninterruptible(MAX_SCHEDULE_TIMEOUT); + } +} +EXPORT_SYMBOL_GPL(torture_shutdown_absorb); |