diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Kconfig.debug | 52 | ||||
| -rw-r--r-- | lib/rwsem.c | 8 |
2 files changed, 56 insertions, 4 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index c4ecb2994ba..89f4035b526 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -494,6 +494,30 @@ config RCU_TORTURE_TEST Say M if you want the RCU torture tests to build as a module. Say N if you are unsure. +config KPROBES_SANITY_TEST + bool "Kprobes sanity tests" + depends on DEBUG_KERNEL + depends on KPROBES + default n + help + This option provides for testing basic kprobes functionality on + boot. A sample kprobe, jprobe and kretprobe are inserted and + verified for functionality. + + Say N if you are unsure. + +config BACKTRACE_SELF_TEST + tristate "Self test for the backtrace code" + depends on DEBUG_KERNEL + default n + help + This option provides a kernel module that can be used to test + the kernel stack backtrace code. This option is not useful + for distributions or general kernels, but only for kernel + developers working on architecture code. + + Say N if you are unsure. + config LKDTM tristate "Linux Kernel Dump Test Tool Module" depends on DEBUG_KERNEL @@ -562,5 +586,33 @@ config LATENCYTOP Enable this option if you want to use the LatencyTOP tool to find out which userspace is blocking on what kernel operations. +config PROVIDE_OHCI1394_DMA_INIT + bool "Provide code for enabling DMA over FireWire early on boot" + depends on PCI && X86 + help + If you want to debug problems which hang or crash the kernel early + on boot and the crashing machine has a FireWire port, you can use + this feature to remotely access the memory of the crashed machine + over FireWire. This employs remote DMA as part of the OHCI1394 + specification which is now the standard for FireWire controllers. + + With remote DMA, you can monitor the printk buffer remotely using + firescope and access all memory below 4GB using fireproxy from gdb. + Even controlling a kernel debugger is possible using remote DMA. + + Usage: + + If ohci1394_dma=early is used as boot parameter, it will initialize + all OHCI1394 controllers which are found in the PCI config space. + + As all changes to the FireWire bus such as enabling and disabling + devices cause a bus reset and thereby disable remote DMA for all + devices, be sure to have the cable plugged and FireWire enabled on + the debugging host before booting the debug target for debugging. + + This code (~1k) is freed after boot. By then, the firewire stack + in charge of the OHCI-1394 controllers should be used instead. + + See Documentation/debugging-via-ohci1394.txt for more information. source "samples/Kconfig" diff --git a/lib/rwsem.c b/lib/rwsem.c index 7d02700a4b0..3e3365e5665 100644 --- a/lib/rwsem.c +++ b/lib/rwsem.c @@ -187,7 +187,7 @@ rwsem_down_failed_common(struct rw_semaphore *sem, /* * wait for the read lock to be granted */ -struct rw_semaphore fastcall __sched * +asmregparm struct rw_semaphore __sched * rwsem_down_read_failed(struct rw_semaphore *sem) { struct rwsem_waiter waiter; @@ -201,7 +201,7 @@ rwsem_down_read_failed(struct rw_semaphore *sem) /* * wait for the write lock to be granted */ -struct rw_semaphore fastcall __sched * +asmregparm struct rw_semaphore __sched * rwsem_down_write_failed(struct rw_semaphore *sem) { struct rwsem_waiter waiter; @@ -216,7 +216,7 @@ rwsem_down_write_failed(struct rw_semaphore *sem) * handle waking up a waiter on the semaphore * - up_read/up_write has decremented the active part of count if we come here */ -struct rw_semaphore fastcall *rwsem_wake(struct rw_semaphore *sem) +asmregparm struct rw_semaphore *rwsem_wake(struct rw_semaphore *sem) { unsigned long flags; @@ -236,7 +236,7 @@ struct rw_semaphore fastcall *rwsem_wake(struct rw_semaphore *sem) * - caller incremented waiting part of count and discovered it still negative * - just wake up any readers at the front of the queue */ -struct rw_semaphore fastcall *rwsem_downgrade_wake(struct rw_semaphore *sem) +asmregparm struct rw_semaphore *rwsem_downgrade_wake(struct rw_semaphore *sem) { unsigned long flags; |