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authorLinus Torvalds <torvalds@linux-foundation.org>2013-02-19 17:45:20 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2013-02-19 17:45:20 -0800
commite84cf5d0fd53badf3a93c790e280cc92a69ed999 (patch)
treeabc4d04bc31e5682794d1ea90c38cfeb4d5c9b97 /lib
parent19f949f52599ba7c3f67a5897ac6be14bfcb1200 (diff)
parentac0e32024b8f40987b3db7d2defdc6b5153ba354 (diff)
downloadlinaro-lsk-e84cf5d0fd53badf3a93c790e280cc92a69ed999.tar.gz
Merge branch 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull RCU changes from Ingo Molnar: "SRCU changes: - These include debugging aids, updates that move towards the goal of permitting srcu_read_lock() and srcu_read_unlock() to be used from idle and offline CPUs, and a few small fixes. Changes to rcutorture and to RCU documentation: - Posted to LKML at https://lkml.org/lkml/2013/1/26/188 Enhancements to uniprocessor handling in tiny RCU: - Posted to LKML at https://lkml.org/lkml/2013/1/27/2 Tag RCU callbacks with grace-period number to simplify callback advancement: - Posted to LKML at https://lkml.org/lkml/2013/1/26/203 Miscellaneous fixes: - Posted to LKML at https://lkml.org/lkml/2013/1/26/204" * 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (27 commits) srcu: use ACCESS_ONCE() to access sp->completed in srcu_read_lock() srcu: Update synchronize_srcu_expedited()'s comments srcu: Update synchronize_srcu()'s comments srcu: Remove checks preventing idle CPUs from calling srcu_read_lock() srcu: Remove checks preventing offline CPUs from calling srcu_read_lock() srcu: Simple cleanup for cleanup_srcu_struct() srcu: Add might_sleep() annotation to synchronize_srcu() srcu: Simplify __srcu_read_unlock() via this_cpu_dec() rcu: Allow rcutorture to be built at low optimization levels rcu: Make rcutorture's shuffler task shuffle recently added tasks rcu: Allow TREE_PREEMPT_RCU on UP systems rcu: Provide RCU CPU stall warnings for tiny RCU context_tracking: Add comments on interface and internals rcu: Remove obsolete Kconfig option from comment rcu: Remove unused code originally used for context tracking rcu: Consolidate debugging Kconfig options rcu: Correct 'optimized' to 'optimize' in header comment rcu: Trace callback acceleration rcu: Tag callback lists with corresponding grace-period number rcutorture: Don't compare ptr with 0 ...
Diffstat (limited to 'lib')
-rw-r--r--lib/Kconfig.debug117
1 files changed, 61 insertions, 56 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 67604e59938..a1714c897e3 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -605,61 +605,6 @@ config PROVE_LOCKING
For more details, see Documentation/lockdep-design.txt.
-config PROVE_RCU
- bool "RCU debugging: prove RCU correctness"
- depends on PROVE_LOCKING
- default n
- help
- This feature enables lockdep extensions that check for correct
- use of RCU APIs. This is currently under development. Say Y
- if you want to debug RCU usage or help work on the PROVE_RCU
- feature.
-
- Say N if you are unsure.
-
-config PROVE_RCU_REPEATEDLY
- bool "RCU debugging: don't disable PROVE_RCU on first splat"
- depends on PROVE_RCU
- default n
- help
- By itself, PROVE_RCU will disable checking upon issuing the
- first warning (or "splat"). This feature prevents such
- disabling, allowing multiple RCU-lockdep warnings to be printed
- on a single reboot.
-
- Say Y to allow multiple RCU-lockdep warnings per boot.
-
- Say N if you are unsure.
-
-config PROVE_RCU_DELAY
- bool "RCU debugging: preemptible RCU race provocation"
- depends on DEBUG_KERNEL && PREEMPT_RCU
- default n
- help
- There is a class of races that involve an unlikely preemption
- of __rcu_read_unlock() just after ->rcu_read_lock_nesting has
- been set to INT_MIN. This feature inserts a delay at that
- point to increase the probability of these races.
-
- Say Y to increase probability of preemption of __rcu_read_unlock().
-
- Say N if you are unsure.
-
-config SPARSE_RCU_POINTER
- bool "RCU debugging: sparse-based checks for pointer usage"
- default n
- help
- This feature enables the __rcu sparse annotation for
- RCU-protected pointers. This annotation will cause sparse
- to flag any non-RCU used of annotated pointers. This can be
- helpful when debugging RCU usage. Please note that this feature
- is not intended to enforce code cleanliness; it is instead merely
- a debugging aid.
-
- Say Y to make sparse flag questionable use of RCU-protected pointers
-
- Say N if you are unsure.
-
config LOCKDEP
bool
depends on DEBUG_KERNEL && TRACE_IRQFLAGS_SUPPORT && STACKTRACE_SUPPORT && LOCKDEP_SUPPORT
@@ -937,6 +882,63 @@ config BOOT_PRINTK_DELAY
BOOT_PRINTK_DELAY also may cause LOCKUP_DETECTOR to detect
what it believes to be lockup conditions.
+menu "RCU Debugging"
+
+config PROVE_RCU
+ bool "RCU debugging: prove RCU correctness"
+ depends on PROVE_LOCKING
+ default n
+ help
+ This feature enables lockdep extensions that check for correct
+ use of RCU APIs. This is currently under development. Say Y
+ if you want to debug RCU usage or help work on the PROVE_RCU
+ feature.
+
+ Say N if you are unsure.
+
+config PROVE_RCU_REPEATEDLY
+ bool "RCU debugging: don't disable PROVE_RCU on first splat"
+ depends on PROVE_RCU
+ default n
+ help
+ By itself, PROVE_RCU will disable checking upon issuing the
+ first warning (or "splat"). This feature prevents such
+ disabling, allowing multiple RCU-lockdep warnings to be printed
+ on a single reboot.
+
+ Say Y to allow multiple RCU-lockdep warnings per boot.
+
+ Say N if you are unsure.
+
+config PROVE_RCU_DELAY
+ bool "RCU debugging: preemptible RCU race provocation"
+ depends on DEBUG_KERNEL && PREEMPT_RCU
+ default n
+ help
+ There is a class of races that involve an unlikely preemption
+ of __rcu_read_unlock() just after ->rcu_read_lock_nesting has
+ been set to INT_MIN. This feature inserts a delay at that
+ point to increase the probability of these races.
+
+ Say Y to increase probability of preemption of __rcu_read_unlock().
+
+ Say N if you are unsure.
+
+config SPARSE_RCU_POINTER
+ bool "RCU debugging: sparse-based checks for pointer usage"
+ default n
+ help
+ This feature enables the __rcu sparse annotation for
+ RCU-protected pointers. This annotation will cause sparse
+ to flag any non-RCU used of annotated pointers. This can be
+ helpful when debugging RCU usage. Please note that this feature
+ is not intended to enforce code cleanliness; it is instead merely
+ a debugging aid.
+
+ Say Y to make sparse flag questionable use of RCU-protected pointers
+
+ Say N if you are unsure.
+
config RCU_TORTURE_TEST
tristate "torture tests for RCU"
depends on DEBUG_KERNEL
@@ -970,7 +972,7 @@ config RCU_TORTURE_TEST_RUNNABLE
config RCU_CPU_STALL_TIMEOUT
int "RCU CPU stall timeout in seconds"
- depends on TREE_RCU || TREE_PREEMPT_RCU
+ depends on RCU_STALL_COMMON
range 3 300
default 21
help
@@ -1008,6 +1010,7 @@ config RCU_CPU_STALL_INFO
config RCU_TRACE
bool "Enable tracing for RCU"
depends on DEBUG_KERNEL
+ select TRACE_CLOCK
help
This option provides tracing in RCU which presents stats
in debugfs for debugging RCU implementation.
@@ -1015,6 +1018,8 @@ config RCU_TRACE
Say Y here if you want to enable RCU tracing
Say N if you are unsure.
+endmenu # "RCU Debugging"
+
config KPROBES_SANITY_TEST
bool "Kprobes sanity tests"
depends on DEBUG_KERNEL