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William Cohen 899d5933b2 Correct the race condition in aarch64_insn_patch_text_sync() 
When experimenting with patches to provide kprobes support for aarch64
smp machines would hang when inserting breakpoints into kernel code.
The hangs were caused by a race condition in the code called by
aarch64_insn_patch_text_sync().  The first processor in the
aarch64_insn_patch_text_cb() function would patch the code while other
processors were still entering the function and incrementing the
cpu_count field.  This resulted in some processors never observing the
exit condition and exiting the function.  Thus, processors in the
system hung.

The first processor to enter the patching function performs the
patching and signals that the patching is complete with an increment
of the cpu_count field. When all the processors have incremented the
cpu_count field the cpu_count will be num_cpus_online()+1 and they
will return to normal execution.

Fixes: ae16480785 arm64: introduce interfaces to hotpatch kernel and module code
Signed-off-by: William Cohen <wcohen@redhat.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
 		2014-11-13 15:21:39 +00:00
..
vdso arm64: vdso: fix build error when switching from LE to BE 2014-07-30 15:06:35 +01:00
.gitignore arm64: Build infrastructure 2012-09-17 13:42:21 +01:00
Makefile PCI changes for the v3.18 merge window: 2014-10-09 15:03:49 -04:00
arm64ksyms.c arm64: Add ftrace support 2014-05-29 09:08:08 +01:00
asm-offsets.c arm64: KVM: implement lazy world switch for debug registers 2014-07-11 04:57:46 -07:00
cpu_ops.c arm64: kernel: enable PSCI cpu operations on UP systems 2014-07-18 15:23:25 +01:00
cpuidle.c arm64: kernel: introduce cpu_init_idle CPU operation 2014-09-12 10:48:55 +01:00
cpuinfo.c arm64: don't flag non-aliasing VIPT I-caches as aliasing 2014-09-08 14:39:18 +01:00
cputable.c arm64: add CPU_HOTPLUG infrastructure 2013-10-25 11:33:21 +01:00
debug-monitors.c KVM/ARM New features for 3.17 include: 2014-08-05 09:47:45 +02:00
efi-entry.S arm64: efi: Fix stub cache maintenance 2014-11-13 14:47:59 +00:00
efi-stub.c arm64/efi: efistub: don't abort if base of DRAM is occupied 2014-09-08 14:39:18 +01:00
efi.c Merge branch 'next' into efi-next-merge 2014-10-03 22:15:56 +01:00
entry-fpsimd.S arm64: fpsimd: fix a typo in fpsimd_save_partial_state ENDPROC 2014-07-31 11:42:42 +01:00
entry-ftrace.S arm64, ftrace: Remove check of obsolete variable function_trace_stop 2014-07-18 13:58:10 -04:00
entry.S arm64: debug: don't re-enable debug exceptions on return from el1_dbg 2014-09-23 15:49:34 +01:00
fpsimd.c arm64: fix bug for reloading FPSIMD state after cpu power off 2014-09-01 12:55:21 +01:00
ftrace.c arm64: Correct ftrace calls to aarch64_insn_gen_branch_imm() 2014-09-19 12:05:45 +01:00
head.S arm64/efi: efistub: cover entire static mem footprint in PE/COFF .text 2014-09-08 14:39:18 +01:00
hw_breakpoint.c arm64: is_compat_task is defined both in asm/compat.h and linux/compat.h 2014-05-12 16:43:29 +01:00
hyp-stub.S irqchip: gic-v3: Initial support for GICv3 2014-07-08 22:11:47 +00:00
image.h arm64: Update the Image header 2014-07-10 12:36:40 +01:00
insn.c Correct the race condition in aarch64_insn_patch_text_sync() 2014-11-13 15:21:39 +00:00
io.c arm64: Device specific operations 2012-09-17 13:42:04 +01:00
irq.c Merge branch 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2014-10-09 06:42:04 -04:00
jump_label.c arm64, jump label: optimize jump label implementation 2014-01-08 15:23:53 +00:00
kgdb.c arm64: Fix typos in KGDB macros 2014-09-25 15:35:41 +01:00
kuser32.S arm64: Add __NR_* definitions for compat syscalls 2014-07-10 11:02:40 +01:00
module.c arm64: move encode_insn_immediate() from module.c to insn.c 2014-01-08 15:21:29 +00:00
pci.c arm64: Add architectural support for PCI 2014-09-30 17:08:57 -06:00
perf_event.c ARM64: make of_device_ids const 2014-10-03 14:49:28 +01:00
perf_regs.c arm64: perf: don't rely on layout of pt_regs when grabbing sp or pc 2014-08-28 20:01:50 +01:00
process.c arm64: ASLR: Don't randomise text when randomise_va_space == 0 2014-10-24 15:47:49 +01:00
psci.c arm64: psci: fix cpu_suspend to check idle state type for index 2014-10-30 16:29:07 +00:00
ptrace.c Merge git://git.infradead.org/users/eparis/audit 2014-10-19 16:25:56 -07:00
return_address.c arm64: LLVMLinux: Use global stack pointer in return_address() 2014-09-08 14:39:19 +01:00
setup.c setup: Move unmask of async interrupts after possible earlycon setup 2014-09-15 18:15:09 +01:00
signal.c arm64: Use sigsp() 2014-08-06 13:03:45 +02:00
signal32.c Merge branch 'signal-cleanup' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/misc 2014-08-09 09:58:12 -07:00
sleep.S arm64: kernel: refactor the CPU suspend API for retention states 2014-09-12 10:48:55 +01:00
smp.c arm64: Tell irq work about self IPI support 2014-09-13 18:46:13 +02:00
smp_spin_table.c arm64: spin-table: handle unmapped cpu-release-addrs 2014-09-08 14:39:18 +01:00
stacktrace.c arm64: LLVMLinux: Use current_stack_pointer in save_stack_trace_tsk 2014-09-08 14:39:19 +01:00
suspend.c arm64: kernel: refactor the CPU suspend API for retention states 2014-09-12 10:48:55 +01:00
sys.c arm64: switch to generic sigaltstack 2013-02-14 09:17:29 -05:00
sys32.S arm64: compat: correct register concatenation for syscall wrappers 2013-10-25 15:59:36 +01:00
sys_compat.c arm64: flush TLS registers during exec 2014-09-11 18:34:58 +01:00
time.c arm64: kernel: initialize broadcast hrtimer based clock event device 2014-05-30 17:48:13 +01:00
topology.c arm64: topology: add MPIDR-based detection 2014-07-09 12:22:40 +01:00
traps.c arm64: LLVMLinux: Use current_stack_pointer in kernel/traps.c 2014-09-08 14:39:19 +01:00
vdso.c arm64,ia64,ppc,s390,sh,tile,um,x86,mm: remove default gate area 2014-08-08 15:57:27 -07:00
vmlinux.lds.S ARM: 8168/1: extend __init_end to a page align address 2014-10-02 21:28:16 +01:00