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Nicholas Piggin 4025c784c5 powerpc/64s: prevent recursive replay_soft_interrupts causing superfluous interrupt 
When an asynchronous interrupt calls irq_exit, it checks for softirqs
that may have been created, and runs them. Running softirqs enables
local irqs, which can replay pending interrupts causing recursion in
replay_soft_interrupts. This abridged trace shows how this can occur:

! NIP replay_soft_interrupts
  LR  interrupt_exit_kernel_prepare
  Call Trace:
    interrupt_exit_kernel_prepare (unreliable)
    interrupt_return
  --- interrupt: ea0 at __rb_reserve_next
  NIP __rb_reserve_next
  LR __rb_reserve_next
  Call Trace:
    ring_buffer_lock_reserve
    trace_function
    function_trace_call
    ftrace_call
    __do_softirq
    irq_exit
    timer_interrupt
!   replay_soft_interrupts
    interrupt_exit_kernel_prepare
    interrupt_return
  --- interrupt: ea0 at arch_local_irq_restore

This can not be prevented easily, because softirqs must not block hard
irqs, so it has to be dealt with.

The recursion is bounded by design in the softirq code because softirq
replay disables softirqs and loops around again to check for new
softirqs created while it ran, so that's not a problem.

However it does mess up interrupt replay state, causing superfluous
interrupts when the second replay_soft_interrupts clears a pending
interrupt, leaving it still set in the first call in the 'happened'
local variable.

Fix this by not caching a copy of irqs_happened across interrupt
handler calls.

Fixes: 3282a3da25 ("powerpc/64: Implement soft interrupt replay in C")
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210123061244.2076145-1-npiggin@gmail.com
 		2021-01-24 22:27:24 +11:00
..
ptrace powerpc/ptrace-view: Use pt_regs values instead of thread_struct based one. 2020-12-04 01:01:26 +11:00
syscalls epoll: wire up syscall epoll_pwait2 2020-12-19 11:18:38 -08:00
trace powerpc: Add a ppc_inst_as_str() helper 2020-07-23 17:41:36 +10:00
vdso32 powerpc/vdso: Don't pass 64-bit ABI cflags to 32-bit VDSO 2020-12-21 22:06:26 +11:00
vdso64 powerpc/vdso: Block R_PPC_REL24 relocations 2020-12-21 22:06:25 +11:00
.gitignore .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
Makefile powerpc: Avoid broken GCC __attribute__((optimize)) 2020-11-19 14:50:14 +11:00
align.c powerpc: Use fallthrough pseudo-keyword 2020-07-29 21:09:37 +10:00
asm-offsets.c powerpc/book3s64/pkeys: Store/restore userspace AMR/IAMR correctly on entry and exit from kernel 2020-12-04 01:01:25 +11:00
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 treewide: Convert macro and uses of __section(foo) to __section("foo") 2020-10-25 14:51:49 -07:00
cacheinfo.c powerpc/cacheinfo: Print correct cache-sibling map/list for L2 cache 2020-12-11 00:10:25 +11:00
cacheinfo.h powerpc/cacheinfo: add cacheinfo_teardown, cacheinfo_rebuild 2019-06-15 16:52:06 +10:00
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/32: Blacklist functions running with MMU disabled for kprobe 2020-06-02 20:59:11 +10:00
cpu_setup_44x.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
cpu_setup_fsl_booke.S powerpc: Retire e200 core (mpc555x processor) 2020-12-05 21:49:18 +11:00
cpu_setup_pa6t.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 333 2019-06-05 17:37:06 +02:00
cpu_setup_power.c powerpc/perf: MMCR0 control for PMU registers under PMCC=00 2020-12-04 01:01:29 +11:00
cpu_setup_ppc970.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
cputable.c powerpc/32s: Make support for 603 and 604+ selectable 2020-12-09 16:48:59 +11:00
crash_dump.c powerpc: Add prefixed instructions to instruction data type 2020-05-19 00:10:39 +10:00
dawr.c powerpc/watchpoint: Guest support for 2nd DAWR hcall 2020-07-26 23:34:19 +10:00
dbell.c powerpc: Inline doorbell sending functions 2020-07-29 21:02:09 +10:00
dma-iommu.c powerpc/dma: Fallback to dma_ops when persistent memory present 2020-11-27 10:33:42 +01:00
dma-mask.c dma-mapping, powerpc: simplify the arch dma_set_mask override 2019-02-18 22:41:03 +11:00
dma-swiotlb.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
dt_cpu_ftrs.c powerpc/64s: Remove idle workaround code from restore_cpu_cpufeatures 2020-12-10 23:13:26 +11:00
early_32.c powerpc/fsl_booke/32: implement KASLR infrastructure 2019-11-13 19:27:40 +11:00
eeh.c powerpc/eeh: Fix eeh_dev_check_failure() for PE#0 2020-10-22 10:38:53 +11:00
eeh_cache.c powerpc/eeh_cache: Fix a possible debugfs deadlock 2020-11-02 12:54:20 +11:00
eeh_driver.c pci-v5.9-changes 2020-08-07 18:48:15 -07:00
eeh_event.c powerpc/eeh: Fix build with STACKTRACE=n 2019-09-14 00:01:14 +10:00
eeh_pe.c powerpc/eeh: Delete eeh_pe->config_addr 2020-10-07 22:34:47 +11:00
eeh_sysfs.c powerpc/eeh: Pass eeh_dev to eeh_ops->resume_notify() 2020-07-26 23:34:20 +10:00
entry_32.S powerpc/fault: Perform exception fixup in do_page_fault() 2020-12-09 23:48:14 +11:00
entry_64.S powerpc/64s: fix scv entry fallback flush vs interrupt 2021-01-20 15:58:19 +11:00
epapr_hcalls.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
epapr_paravirt.c powerpc: Use a datatype for instructions 2020-05-19 00:10:37 +10:00
exceptions-64e.S powerpc/fault: Perform exception fixup in do_page_fault() 2020-12-09 23:48:14 +11:00
exceptions-64s.S powerpc/64s: fix scv entry fallback flush vs interrupt 2021-01-20 15:58:19 +11:00
fadump.c powerpc updates for 5.10 2020-10-16 12:21:15 -07:00
firmware.c powerpc: Reintroduce is_kvm_guest() as a fast-path check 2020-12-04 01:01:22 +11:00
fpu.S powerpc: Drop SYNC_601() ISYNC_601() and SYNC() 2020-10-08 21:17:13 +11:00
fsl_booke_entry_mapping.S powerpc/fsl_booke/32: implement KASLR infrastructure 2019-11-13 19:27:40 +11:00
head_8xx.S powerpc/8xx: Use SPRN_SPRG_SCRATCH2 in DTLB miss exception 2020-12-09 23:48:13 +11:00
head_32.h powerpc/32: Fix vmap stack - Properly set r1 before activating MMU on syscall too 2020-12-21 22:24:00 +11:00
head_40x.S powerpc/40x: Always fault when _PAGE_ACCESSED is not set 2020-11-05 23:34:16 +11:00
head_44x.S mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
head_64.S powerpc/64s: Remove MSR[ISF] bit 2020-12-09 23:48:14 +11:00
head_book3s_32.S powerpc/32s: Fix RTAS machine check with VMAP stack 2021-01-04 23:59:25 +11:00
head_booke.h powerpc: Retire e200 core (mpc555x processor) 2020-12-05 21:49:18 +11:00
head_fsl_booke.S powerpc: Retire e200 core (mpc555x processor) 2020-12-05 21:49:18 +11:00
hw_breakpoint.c powerpc/watchpoint: Workaround P10 DD1 issue with VSX-32 byte instructions 2020-12-11 00:09:10 +11:00
hw_breakpoint_constraints.c powerpc/watchpoint: Move DAWR detection logic outside of hw_breakpoint.c 2020-09-15 22:13:19 +10:00
idle.c sched/idle: Fix arch_cpu_idle() vs tracing 2020-11-24 16:47:35 +01:00
idle_6xx.S powerpc/32: Blacklist functions running with MMU disabled for kprobe 2020-06-02 20:59:11 +10:00
idle_book3e.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
idle_book3s.S powerpc/64s: Reimplement power4_idle code in C 2020-01-16 14:59:37 +10:00
idle_e500.S powerpc/32: Blacklist functions running with MMU disabled for kprobe 2020-06-02 20:59:11 +10:00
ima_arch.c powerpc/ima: Fix secure boot rules in ima arch policy 2020-05-07 17:25:54 +10:00
io-workarounds.c mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
io.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
iomap.c powerpc: inline iomap accessors 2020-12-04 01:01:09 +11:00
iommu.c dma-mapping: introduce dma_get_seg_boundary_nr_pages() 2020-09-03 18:12:15 +02:00
irq.c powerpc/64s: prevent recursive replay_soft_interrupts causing superfluous interrupt 2021-01-24 22:27:24 +11:00
isa-bridge.c powerpc: remove __ioremap_at and __iounmap_at 2020-06-02 10:59:10 -07:00
jump_label.c powerpc: Use a datatype for instructions 2020-05-19 00:10:37 +10:00
kgdb.c maccess: make get_kernel_nofault() check for minimal type compatibility 2020-06-18 12:10:37 -07:00
kprobes-ftrace.c ftrace: Have the callbacks receive a struct ftrace_regs instead of pt_regs 2020-11-13 12:14:55 -05:00
kprobes.c powerpc: kprobes: Use generic kretprobe trampoline handler 2020-09-08 11:52:34 +02:00
kvm.c powerpc/kvm: Explicitly mark kvm guest code as __init 2019-09-14 00:04:40 +10:00
kvm_emul.S powerpc/kvm: Add ifdefs around template code 2019-09-14 00:04:40 +10:00
l2cr_6xx.S powerpc: Drop SYNC_601() ISYNC_601() and SYNC() 2020-10-08 21:17:13 +11:00
legacy_serial.c tty/serial: Migrate 8250_fsl to use has_sysrq 2019-12-18 15:04:42 +01:00
mce.c powerpc/64s: Remove "Host" from MCE logging 2020-12-04 01:01:23 +11:00
mce_power.c powerpc/64s/pseries: Add ERAT specific machine check handler 2020-12-04 01:01:23 +11:00
misc.S powerpc/32: Blacklist functions running with MMU disabled for kprobe 2020-06-02 20:59:11 +10:00
misc_32.S powerpc: Rewrite FSL_BOOKE flush_cache_instruction() in C 2020-09-02 11:00:21 +10:00
misc_64.S powerpc: Remove SYNC on non 6xx 2020-10-08 21:17:12 +11:00
module.c powerpc: Use MODULES_VADDR if defined 2020-07-27 00:01:30 +10:00
module_32.c powerpc: module_[32|64].c: replace swap function with built-in one 2020-05-11 23:15:14 +10:00
module_64.c maccess: rename probe_kernel_{read,write} to copy_{from,to}_kernel_nofault 2020-06-17 10:57:41 -07:00
msi.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
note.S powerpc: Add PowerPC Capabilities ELF note 2019-08-30 09:40:15 +10:00
nvram_64.c powerpc updates for 5.8 2020-06-05 12:39:30 -07:00
of_platform.c powerpc/eeh: Remove eeh_dev_phb_init_dynamic() 2020-07-26 23:34:19 +10:00
optprobes.c powerpc: Add ppc_inst_as_u64() 2020-05-26 23:36:57 +10:00
optprobes_head.S powerpc: Add prefixed instructions to instruction data type 2020-05-19 00:10:39 +10:00
paca.c powerpc: Avoid broken GCC __attribute__((optimize)) 2020-11-19 14:50:14 +11:00
pci-common.c powerpc/pci: Remove LSI mappings on device teardown 2020-12-04 01:01:34 +11:00
pci-hotplug.c powerpc/eeh: Release EEH device state synchronously 2020-05-18 21:58:44 +10:00
pci_32.c powerpc/64: Adjust order in pcibios_init() 2019-08-22 23:11:48 +10:00
pci_64.c powerpc updates for 5.8 2020-06-05 12:39:30 -07:00
pci_dn.c powerpc/eeh: Rename eeh_{add_to|remove_from}_parent_pe() 2020-07-26 23:34:21 +10:00
pci_of_scan.c powerpc/pci: Remove pcibios_setup_bus_devices() 2020-01-06 16:25:29 +11:00
pmc.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
ppc32.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
ppc_save_regs.S powerpc: Improve ppc_save_regs() 2020-04-04 21:40:57 +11:00
proc_powerpc.c proc: convert everything to "struct proc_ops" 2020-02-04 03:05:26 +00:00
process.c powerpc/process: Remove target specific __set_dabr() 2020-12-09 17:01:40 +11:00
prom.c powerpc/feature: Remove CPU_FTR_NODSISRALIGN 2020-12-04 01:01:34 +11:00
prom_init.c powerpc: fix -Wimplicit-fallthrough 2020-11-18 14:18:09 -06:00
prom_init_check.sh powerpc/prom_init: Undo relocation before entering secure mode 2019-10-29 15:12:17 +11:00
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
reloc_32.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
reloc_64.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
rtas-proc.c proc: convert everything to "struct proc_ops" 2020-02-04 03:05:26 +00:00
rtas-rtc.c powerpc: use time64_t in read_persistent_clock 2018-06-03 20:43:33 +10:00
rtas.c powerpc/rtas: Fix typo of ibm,open-errinjct in RTAS filter 2020-12-09 13:36:51 +11:00
rtas_flash.c proc: convert everything to "struct proc_ops" 2020-02-04 03:05:26 +00:00
rtas_pci.c mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
rtasd.c powerpc/rtasd: simplify handle_rtas_event(), emit message on events 2020-07-16 13:12:38 +10:00
secure_boot.c powerpc/pseries: Detect secure and trusted boot state of the system. 2020-07-16 14:49:53 +10:00
security.c powerpc/security: Fix link stack flush instruction 2020-10-08 12:50:52 +11:00
secvar-ops.c powerpc/powernv: Add OPAL API interface to access secure variable 2019-11-13 00:33:22 +11:00
secvar-sysfs.c powerpc: expose secure variables to userspace via sysfs 2019-11-13 00:33:22 +11:00
setup-common.c powerpc: Remove ucache_bsize 2020-12-05 21:49:52 +11:00
setup.h powerpc: Avoid broken GCC __attribute__((optimize)) 2020-11-19 14:50:14 +11:00
setup_32.c powerpc: Remove ucache_bsize 2020-12-05 21:49:52 +11:00
setup_64.c Merge branch 'fixes' into next 2020-11-25 23:17:31 +11:00
signal.c powerpc updates for 5.11 2020-12-17 13:34:25 -08:00
signal.h powerpc/signal: Create 'unsafe' versions of copy_[ck][fpr/vsx]_to_user() 2020-12-04 01:01:14 +11:00
signal_32.c powerpc/vdso: Retrieve sigtramp offsets at buildtime 2020-12-04 01:01:17 +11:00
signal_64.c powerpc/vdso: Retrieve sigtramp offsets at buildtime 2020-12-04 01:01:17 +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/smp: Add __init to init_big_cores() 2020-12-21 22:06:10 +11:00
stacktrace.c kernel: rename show_stack_loglvl() => show_stack() 2020-06-09 09:39:13 -07:00
suspend.c PM: hibernate: powerpc: Expose pfn_is_nosave() prototype 2019-06-14 10:48:56 +02:00
swsusp.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
swsusp_32.S powerpc/32: Blacklist functions running with MMU disabled for kprobe 2020-06-02 20:59:11 +10:00
swsusp_64.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 505 2019-06-19 17:11:22 +02:00
swsusp_asm64.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 505 2019-06-19 17:11:22 +02:00
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
sys_ppc32.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
syscall_64.c powerpc/book3s64/pkeys: Optimize KUAP and KUEP feature disabled case 2020-12-04 01:01:28 +11:00
syscalls.c y2038: syscalls: change remaining timeval to __kernel_old_timeval 2019-11-15 14:38:29 +01:00
sysfs.c powerpc/sysfs: Remove unused 'err' variable in sysfs_create_dscr_default() 2020-09-18 20:05:24 +10:00
systbl.S powerpc/64/sycall: Implement syscall entry/exit logic in C 2020-04-01 13:42:13 +11:00
systbl_chk.sh treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
tau_6xx.c powerpc/tau: Disable TAU between measurements 2020-09-15 22:13:30 +10:00
time.c powerpc updates for 5.11 2020-12-17 13:34:25 -08:00
tm.S powerpc/tm: Save and restore AMR on treclaim and trechkpt 2020-10-06 23:22:25 +11:00
traps.c powerpc: Retire e200 core (mpc555x processor) 2020-12-05 21:49:18 +11:00
ucall.S powerpc/kernel: Add ucall_norets() ultravisor call handler 2019-08-30 09:40:15 +10:00
udbg.c powerpc/udbg: Make it safe to call udbg_printf() always 2019-10-11 19:33:25 +11:00
udbg_16550.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
uprobes.c powerpc: fix -Wimplicit-fallthrough 2020-11-18 14:18:09 -06:00
vdso.c powerpc/vdso: Remove DBG() 2020-12-04 01:01:19 +11:00
vecemu.c powerpc: Define and use get_user_instr() et. al. 2020-05-19 00:10:37 +10:00
vector.S powerpc: re-initialise lazy FPU/VEC counters on every fault 2020-07-16 13:00:24 +10:00
vmlinux.lds.S powerpc/64s: fix scv entry fallback flush vs interrupt 2021-01-20 15:58:19 +11:00
watchdog.c powerpc/watchdog: Use hrtimers for per-CPU heartbeat 2019-04-30 11:31:02 +10:00