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Naveen N. Rao ea678ac627 powerpc64/ftrace: Add a field in paca to disable ftrace in unsafe code paths 
We have some C code that we call into from real mode where we cannot
take any exceptions. Though the C functions themselves are mostly safe,
if these functions are traced, there is a possibility that we may take
an exception. For instance, in certain conditions, the ftrace code uses
WARN(), which uses a 'trap' to do its job.

For such scenarios, introduce a new field in paca 'ftrace_enabled',
which is checked on ftrace entry before continuing. This field can then
be set to zero to disable/pause ftrace, and set to a non-zero value to
resume ftrace.

Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-05-03 22:32:25 +10:00
..
trace
powerpc64/ftrace: Add a field in paca to disable ftrace in unsafe code paths
2018-05-03 22:32:25 +10:00
vdso32
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
vdso64
powerpc/vdso64: Add support for CLOCK_{REALTIME/MONOTONIC}_COARSE
2017-12-04 15:01:09 +11:00
.gitignore
…
align.c
powerpc: Fix check for copy/paste instructions in alignment handler
2017-10-25 12:42:35 +02:00
asm-offsets.c
powerpc64/ftrace: Add a field in paca to disable ftrace in unsafe code paths
2018-05-03 22:32:25 +10:00
audit.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
btext.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
cacheinfo.c
powerpc: Convert to using %pOF instead of full_name
2017-08-23 22:27:04 +10:00
cacheinfo.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
compat_audit.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
cpu_setup_6xx.S
powerpc: Free up CPU feature bits on 64-bit machines
2018-03-24 00:38:51 +11:00
cpu_setup_44x.S
…
cpu_setup_fsl_booke.S
powerpc: Free up CPU feature bits on 64-bit machines
2018-03-24 00:38:51 +11:00
cpu_setup_pa6t.S
…
cpu_setup_power.S
Merge branch 'fixes' into next
2018-01-21 23:21:14 +11:00
cpu_setup_ppc970.S
…
cputable.c
powerpc/64s: Remove POWER4 support
2018-04-01 00:47:50 +11:00
crash_dump.c
Replace <asm/uaccess.h> with <linux/uaccess.h> globally
2016-12-24 11:46:01 -08:00
crash.c
powerpc/64: Use array of paca pointers and allocate pacas individually
2018-03-30 23:34:23 +11:00
dbell.c
powerpc: Introduce msgsnd/doorbell barrier primitives
2017-04-13 23:34:33 +10:00
dma-iommu.c
powerpc: rename dma_direct_ to dma_nommu_
2018-01-10 16:41:14 +01:00
dma-swiotlb.c
swiotlb: rename swiotlb_free to swiotlb_exit
2018-01-15 09:35:39 +01:00
dma.c
powerpc: rename swiotlb_dma_ops
2018-01-15 09:35:26 +01:00
dt_cpu_ftrs.c
powerpc/64s: Fix CPU_FTRS_ALWAYS vs DT CPU features
2018-04-13 23:51:44 +10:00
eeh_cache.c
powerpc/eeh: Fix misleading comment in __eeh_addr_cache_get_device()
2018-03-27 23:44:58 +11:00
eeh_dev.c
powerpc/eeh: Create PHB PEs after EEH is initialized
2017-09-21 14:56:00 +10:00
eeh_driver.c
powerpc/eeh: Fix race with driver un/bind
2018-04-01 00:47:45 +11:00
eeh_event.c
powerpc/eeh: Manage EEH_PE_RECOVERING inside eeh_handle_normal_event()
2018-03-27 23:44:58 +11:00
eeh_pe.c
powerpc/eeh: Fix enabling bridge MMIO windows
2018-04-19 13:02:38 +10:00
eeh_sysfs.c
powerpc/eeh: Add EEH notify resume sysfs
2018-01-27 20:02:52 +11:00
eeh.c
powerpc/eeh: Add eeh_state_active() helper
2018-03-27 23:45:19 +11:00
entry_32.S
powerpc/8xx: Only perform perf counting when perf is in use.
2018-01-16 23:47:12 +11:00
entry_64.S
powerpc/64s: Set assembler machine type to POWER4
2018-04-01 00:47:49 +11:00
epapr_hcalls.S
ppc: move exports to definitions
2016-08-07 23:50:09 -04:00
epapr_paravirt.c
…
exceptions-64e.S
powerpc/64s: Fix may_hard_irq_enable() for PMI soft masking
2018-02-08 23:56:10 +11:00
exceptions-64s.S
powerpc/64s: Set assembler machine type to POWER4
2018-04-01 00:47:49 +11:00
fadump.c
Revert "powerpc: Do not call ppc_md.panic in fadump panic notifier"
2017-12-05 23:21:46 +11:00
firmware.c
…
fpu.S
Merge branch 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild
2016-10-14 14:26:58 -07:00
fsl_booke_entry_mapping.S
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
head_8xx.S
powerpc/8xx: Use L1 entry APG to handle _PAGE_ACCESSED for CONFIG_SWAP
2018-01-16 23:47:15 +11:00
head_32.S
powerpc: Fix DABR match on hash based systems
2017-11-13 22:12:48 +11:00
head_40x.S
ppc: move exports to definitions
2016-08-07 23:50:09 -04:00
head_44x.S
ppc: move exports to definitions
2016-08-07 23:50:09 -04:00
head_64.S
powerpc/64: Use array of paca pointers and allocate pacas individually
2018-03-30 23:34:23 +11:00
head_booke.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
head_fsl_booke.S
ppc: move exports to definitions
2016-08-07 23:50:09 -04:00
hw_breakpoint.c
powerpc: Update ptrace to use ppc_breakpoint_available()
2018-03-27 23:52:44 +11:00
idle_6xx.S
…
idle_book3e.S
powerpc/64: Rename soft_enabled to irq_soft_mask
2018-01-19 22:37:01 +11:00
idle_book3s.S
powerpc/kvm: Fix lockups when running KVM guests on Power8
2018-04-19 16:22:20 +10:00
idle_e500.S
powerpc/e500mc: Remove dead L2 flushing code in idle_e500.S
2015-06-02 21:37:19 -05:00
idle_power4.S
powerpc/64: Rename soft_enabled to irq_soft_mask
2018-01-19 22:37:01 +11:00
idle.c
…
ima_kexec.c
powerpc: ima: send the kexec buffer to the next kernel
2016-12-20 09:48:44 -08:00
io-workarounds.c
powerpc: Convert to using %pOF instead of full_name
2017-08-23 22:27:04 +10:00
io.c
…
iomap.c
powerpc: iomap.c: introduce io{read|write}64_{lo_hi|hi_lo}
2018-04-05 14:59:26 +10:00
iommu.c
powerpc/iommu: Use permission-specific DEVICE_ATTR variants
2017-09-01 16:42:54 +10:00
irq.c
powerpc/64s: Fix lost pending interrupt due to race causing lost update to irq_happened
2018-03-23 08:41:40 +11:00
isa-bridge.c
powerpc: Convert to using %pOF instead of full_name
2017-08-23 22:27:04 +10:00
jump_label.c
jump_label: Rename JUMP_LABEL_{EN,DIS}ABLE to JUMP_LABEL_{JMP,NOP}
2015-08-03 11:34:12 +02:00
kexec_elf_64.c
kernel/kexec_file.c: allow archs to set purgatory load address
2018-04-13 17:10:28 -07:00
kgdb.c
powerpc/8xx: Getting rid of remaining use of CONFIG_8xx
2017-08-10 23:32:12 +10:00
kprobes-ftrace.c
powerpc/kprobes: Do not disable interrupts for optprobes and kprobes_on_ftrace
2017-11-12 23:51:41 +11:00
kprobes.c
powerpc/kprobes: Fix call trace due to incorrect preempt count
2018-03-31 00:10:33 +11:00
kvm_emul.S
…
kvm.c
powerpc/64: Fix watchdog configuration regressions
2017-08-31 14:26:00 +10:00
l2cr_6xx.S
powerpc/l2cr_6xx: Fix invalid use of register expressions
2017-08-15 21:04:32 +10:00
legacy_serial.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
machine_kexec_32.c
…
machine_kexec_64.c
powerpc/64s: Allocate LPPACAs individually
2018-03-30 23:34:24 +11:00
machine_kexec_file_64.c
kexec_file,x86,powerpc: factor out kexec_file_ops functions
2018-04-13 17:10:27 -07:00
machine_kexec.c
powerpc: Update of_remove_property() call sites to remove null checking
2016-05-11 21:54:04 +10:00
Makefile
powerpc updates for 4.17
2018-04-07 12:08:19 -07:00
mce_power.c
powerpc/mce: Fix a bug where mce loops on memory UE.
2018-04-24 13:54:51 +10:00
mce.c
powerpc updates for 4.16
2018-02-02 10:01:04 -08:00
misc_32.S
powerpc/40x: Clear MSR_DR in one insn instead of two
2017-06-02 19:20:43 +10:00
misc_64.S
powerpc: Remove unused flush_dcache_phys_range()
2018-03-20 16:47:53 +11:00
misc.S
ppc: move exports to definitions
2016-08-07 23:50:09 -04:00
module_32.c
powerpc/module: Only try to generate the ftrace_caller() stub once
2016-03-07 14:53:53 +11:00
module_64.c
powerpc updates for 4.16
2018-02-02 10:01:04 -08:00
module.c
Replace <asm/uaccess.h> with <linux/uaccess.h> globally
2016-12-24 11:46:01 -08:00
module.lds
powerpc/modules: Fix alignment of .toc section in kernel modules
2017-12-11 13:03:35 +11:00
msi.c
powerpc: Remove MSI-related PCI controller ops from ppc_md
2015-06-02 11:47:45 +10:00
nvram_64.c
powerpc: Use sizeof(*foo) rather than sizeof(struct foo)
2018-03-20 16:47:53 +11:00
of_platform.c
powerpc: Convert to using %pOF instead of full_name
2017-08-23 22:27:04 +10:00
optprobes_head.S
powerpc/64: Rename soft_enabled to irq_soft_mask
2018-01-19 22:37:01 +11:00
optprobes.c
powerpc/kprobes: Do not disable interrupts for optprobes and kprobes_on_ftrace
2017-11-12 23:51:41 +11:00
paca.c
Merge branch 'topic/paca' into next
2018-03-31 09:09:36 +11:00
pci_32.c
powerpc/PCI: Deprecate pci_get_bus_and_slot()
2018-01-11 17:21:55 -06:00
pci_64.c
powerpc/64s: Replace CONFIG_PPC_STD_MMU_64 with CONFIG_PPC_BOOK3S_64
2017-11-06 16:48:14 +11:00
pci_dn.c
powerpc/pci: Separate SR-IOV Calls
2017-12-11 13:03:35 +11:00
pci_of_scan.c
pci-v4.16-changes
2018-02-06 09:59:40 -08:00
pci-common.c
powerpc/pci: Use generic pci_mmap_resource_range()
2018-02-28 16:18:53 -06:00
pci-hotplug.c
powerpc/pci: Unroll two pass loop when scanning bridges
2017-12-18 23:05:52 -06:00
pmc.c
…
ppc32.h
…
ppc_save_regs.S
…
proc_powerpc.c
powerpc: Use octal numbers for file permissions
2018-01-22 05:48:33 +11:00
process.c
powerpc: Don't write to DABR on >= Power8 if DAWR is disabled
2018-04-03 21:50:08 +10:00
prom_init_check.sh
powerpc/mm/radix: Update command line parsing for disable_radix
2018-04-04 16:59:50 +10:00
prom_init.c
powerpc/mm/radix: Update command line parsing for disable_radix
2018-04-04 16:59:50 +10:00
prom_parse.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
prom.c
Merge branch 'topic/paca' into next
2018-03-31 09:09:36 +11:00
ptrace32.c
Replace <asm/uaccess.h> with <linux/uaccess.h> globally
2016-12-24 11:46:01 -08:00
ptrace.c
powerpc: Update ptrace to use ppc_breakpoint_available()
2018-03-27 23:52:44 +11:00
reloc_32.S
…
reloc_64.S
powerpc/asm: Convert .llong directives to .8byte
2017-08-31 14:26:47 +10:00
rtas_flash.c
powerpc: Use octal numbers for file permissions
2018-01-22 05:48:33 +11:00
rtas_pci.c
powerpc/kernel: Change retrieval of pci_dn
2017-08-31 14:26:40 +10:00
rtas-proc.c
powerpc: Use octal numbers for file permissions
2018-01-22 05:48:33 +11:00
rtas-rtc.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
rtas.c
locking/arch, powerpc/rtas: Use arch_spin_lock() instead of arch_spin_lock_flags()
2017-10-18 15:15:07 +02:00
rtasd.c
vfs: do bulk POLL* -> EPOLL* replacement
2018-02-11 14:34:03 -08:00
security.c
powerpc: Move default security feature flags
2018-04-03 21:50:08 +10:00
setup_32.c
powerpc/32: Add missing prototypes for (early|machine)_init()
2018-03-13 15:50:42 +11:00
setup_64.c
powerpc64/ftrace: Add a field in paca to disable ftrace in unsafe code paths
2018-05-03 22:32:25 +10:00
setup-common.c
powerpc/64e: Fix oops due to deferral of paca allocation
2018-04-01 00:47:38 +11:00
setup.h
powerpc/64: move default SPR recording
2018-03-30 23:34:26 +11:00
signal_32.c
powerpc/32: Mark both tmp variables as unused
2018-03-13 15:50:33 +11:00
signal_64.c
powerpc/tm: Fix endianness flip on trap
2018-01-22 05:48:36 +11:00
signal.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/livepatching
2018-01-31 13:02:18 -08:00
signal.h
powerpc: Add missing prototypes for sys_sigreturn() & sys_rt_sigreturn()
2018-03-13 15:50:39 +11:00
smp-tbsync.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
smp.c
powerpc: Fix deadlock with multiple calls to smp_send_stop
2018-04-27 16:35:57 +10:00
stacktrace.c
powerpc: Make /proc/self/stack always print the current stack
2017-03-28 14:43:59 +11:00
suspend.c
…
swsusp_32.S
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
swsusp_64.c
sched/headers: Prepare for new header dependencies before moving code to <linux/sched/nmi.h>
2017-03-02 08:42:30 +01:00
swsusp_asm64.S
powerpc: Fix invalid use of register expressions
2017-08-10 22:29:41 +10:00
swsusp_booke.S
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
swsusp.c
powerpc/swsusp: Include suspend.h to silence sparse warnings
2017-03-20 19:02:49 +11:00
sys_ppc32.c
mm: add ksys_readahead() helper; remove in-kernel calls to sys_readahead()
2018-04-02 20:16:12 +02:00
syscalls.c
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-next
2018-04-03 14:08:58 -07:00
sysfs.c
Merge branch 'topic/paca' into next
2018-03-31 09:09:36 +11:00
systbl_chk.c
powerpc: Standardise on NR_syscalls rather than __NR_syscalls.
2015-11-26 22:11:17 +11:00
systbl_chk.sh
powerpc: Standardise on NR_syscalls rather than __NR_syscalls.
2015-11-26 22:11:17 +11:00
systbl.S
powerpc/asm: Convert .llong directives to .8byte
2017-08-31 14:26:47 +10:00
tau_6xx.c
treewide: setup_timer() -> timer_setup()
2017-11-21 15:57:07 -08:00
time.c
powerpc: Fix oops due to bad access of lppaca on bare metal
2018-04-03 21:50:07 +10:00
tm.S
powerpc updates for 4.15
2017-11-16 12:47:46 -08:00
traps.c
powerpc/fscr: Enable interrupts earlier before calling get_user()
2018-04-10 11:23:23 +10:00
udbg_16550.c
…
udbg.c
powerpc: Remove the celleb support
2015-04-07 17:15:13 +10:00
uprobes.c
powerpc/uprobes: Implement arch_uretprobe_is_alive()
2017-08-24 16:19:21 +10:00
vdso.c
powerpc: Use feature bit for RTC presence rather than timebase presence
2018-03-24 00:36:45 +11:00
vecemu.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
vector.S
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
vmlinux.lds.S
powerpc updates for 4.16
2018-02-02 10:01:04 -08:00
watchdog.c
powerpc/watchdog: Print the NIP in soft_nmi_interrupt()
2018-01-28 17:08:29 +11:00