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rcutorture: Abstract torture_shutdown_absorb()

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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>`
This commit is contained in:
Paul E. McKenney
2014-01-29 07:40:27 -08:00
parent c2884de38e
commit f67a33561e
3 changed files with 53 additions and 39 deletions
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15
include/linux/torture.h
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@@ -41,6 +41,18 @@
module_param(name, type, 0444); \
MODULE_PARM_DESC(name, msg);
/* Mediate rmmod and system shutdown. Concurrent rmmod & shutdown illegal! */
#define FULLSTOP_DONTSTOP 0 /* Normal operation. */
#define FULLSTOP_SHUTDOWN 1 /* System shutdown with rcutorture running. */
#define FULLSTOP_RMMOD 2 /* Normal rmmod of rcutorture. */
extern int fullstop;
/* Protect fullstop transitions and spawning of kthreads. */
extern struct mutex fullstop_mutex;
/* Common module parameters. */
extern char *torture_type;
extern bool verbose;
#define TORTURE_FLAG "-torture:"
#define TOROUT_STRING(s) \
pr_alert("%s" TORTURE_FLAG s "\n", torture_type)
@@ -57,4 +69,7 @@ struct torture_random_state {
#define DEFINE_TORTURE_RANDOM(name) struct torture_random_state name = { 0, 0 }
unsigned long torture_random(struct torture_random_state *trsp);
/* Shutdown task absorption, for when the tasks cannot safely be killed. */
void torture_shutdown_absorb(const char *title);
#endif /* __LINUX_TORTURE_H */