Yang Shi 62c6c61adb arm64: replace read_lock to rcu lock in call_break_hook ... BUG: sleeping function called from invalid context at kernel/locking/rtmutex.c:917 in_atomic(): 0, irqs_disabled(): 128, pid: 342, name: perf 1 lock held by perf/342: #0: (break_hook_lock){+.+...}, at: [<ffffffc0000851ac>] call_break_hook+0x34/0xd0 irq event stamp: 62224 hardirqs last enabled at (62223): [<ffffffc00010b7bc>] __call_rcu.constprop.59+0x104/0x270 hardirqs last disabled at (62224): [<ffffffc0000fbe20>] vprintk_emit+0x68/0x640 softirqs last enabled at (0): [<ffffffc000097928>] copy_process.part.8+0x428/0x17f8 softirqs last disabled at (0): [< (null)>] (null) CPU: 0 PID: 342 Comm: perf Not tainted 4.1.6-rt5 #4 Hardware name: linux,dummy-virt (DT) Call trace: [<ffffffc000089968>] dump_backtrace+0x0/0x128 [<ffffffc000089ab0>] show_stack+0x20/0x30 [<ffffffc0007030d0>] dump_stack+0x7c/0xa0 [<ffffffc0000c878c>] ___might_sleep+0x174/0x260 [<ffffffc000708ac8>] __rt_spin_lock+0x28/0x40 [<ffffffc000708db0>] rt_read_lock+0x60/0x80 [<ffffffc0000851a8>] call_break_hook+0x30/0xd0 [<ffffffc000085a70>] brk_handler+0x30/0x98 [<ffffffc000082248>] do_debug_exception+0x50/0xb8 Exception stack(0xffffffc00514fe30 to 0xffffffc00514ff50) fe20: 00000000 00000000 c1594680 0000007f fe40: ffffffff ffffffff 92063940 0000007f 0550dcd8 ffffffc0 00000000 00000000 fe60: 0514fe70 ffffffc0 000be1f8 ffffffc0 0514feb0 ffffffc0 0008948c ffffffc0 fe80: 00000004 00000000 0514fed0 ffffffc0 ffffffff ffffffff 9282a948 0000007f fea0: 00000000 00000000 9282b708 0000007f c1592820 0000007f 00083914 ffffffc0 fec0: 00000000 00000000 00000010 00000000 00000064 00000000 00000001 00000000 fee0: 005101e0 00000000 c1594680 0000007f c1594740 0000007f ffffffd8 ffffff80 ff00: 00000000 00000000 00000000 00000000 c1594770 0000007f c1594770 0000007f ff20: 00665e10 00000000 7f7f7f7f 7f7f7f7f 01010101 01010101 00000000 00000000 ff40: 928e4cc0 0000007f 91ff11e8 0000007f call_break_hook is called in atomic context (hard irq disabled), so replace the sleepable lock to rcu lock, replace relevant list operations to rcu version and call synchronize_rcu() in unregister_break_hook(). And, replace write lock to spinlock in {un}register_break_hook. Signed-off-by: Yang Shi <yang.shi@linaro.org> Signed-off-by: Will Deacon <will.deacon@arm.com>		2015-10-06 19:10:28 +01:00
..
boot	Documentation: arm: Fix typo in the idle-states bindings examples	2015-09-24 17:55:32 -05:00
configs	arm64: Enable Marvell Berlin SoC family in defconfig	2015-08-06 10:15:57 +02:00
crypto	crypto: aead - Remove CRYPTO_ALG_AEAD_NEW flag	2015-08-17 16:53:53 +08:00
include	arm64: Fix THP protection change logic	2015-10-01 18:02:21 +01:00
kernel	arm64: replace read_lock to rcu lock in call_break_hook	2015-10-06 19:10:28 +01:00
kvm	Second set of KVM/ARM changes for 4.3-rc2	2015-09-17 16:51:59 +02:00
lib	arm64: atomics: prefetch the destination word for write prior to stxr	2015-07-27 15:28:53 +01:00
mm	arm64: readahead: fault retry breaks mmap file read random detection	2015-10-05 16:30:50 +01:00
net	arm64: bpf: fix endianness conversion bugs	2015-06-26 14:15:39 +01:00
xen	arm: xen: implement multicall hypercall support.	2014-04-24 13:09:46 +01:00
Kconfig	arm64: errata: add module build workaround for erratum #843419	2015-09-17 11:57:03 +01:00
Kconfig.debug	coresight: moving to new "hwtracing" directory	2015-04-03 16:17:04 +02:00
Kconfig.platforms	arm64: Enable Marvell Berlin SoC family in Kconfig	2015-08-06 10:15:01 +02:00
Makefile	arm64: errata: add module build workaround for erratum #843419	2015-09-17 11:57:03 +01:00