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e7ec1d2eac
linux/arch/s390/kernel
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Alexander Gordeev e7ec1d2eac s390/mcck: cleanup user process termination path 
If a machine check interrupt hits while user process is
running __s390_handle_mcck() helper function is called
directly from the interrupt handler and terminates the
current process by calling make_task_dead() routine.

The make_task_dead() is not allowed to be called from
interrupt context which forces the machine check handler
switch to the kernel stack and enable local interrupts
first.

The __s390_handle_mcck() could also be called to service
pending work, but this time from the external interrupts
handler. It is the machine check handler that establishes
the work and schedules the external interrupt, therefore
the machine check interrupt itself should be disabled
while reading out the corresponding variable:

	local_mcck_disable();
	mcck = *this_cpu_ptr(&cpu_mcck);
	memset(this_cpu_ptr(&cpu_mcck), 0, sizeof(mcck));
	local_mcck_enable();

However, local_mcck_disable() does not have effect when
__s390_handle_mcck() is called directly form the machine
check handler, since the machine check interrupt is still
disabled. Therefore, it is not the opening bracket to the
following local_mcck_enable() function.

Simplify the user process termination flow by scheduling
the external interrupt and killing the affected process
from the interrupt context.

Assume a kernel-generated signal is always delivered and
ignore a value returned by do_send_sig_info() funciton.

Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Reviewed-by: Sven Schnelle <svens@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
2023-02-28 13:19:05 +01:00
..
syscalls arch: syscalls: simplify uapi/kapi directory creation 2022-03-31 12:03:46 +09:00
vdso32 s390/vdso: remove -nostdlib compiler flag 2021-11-16 12:29:19 +01:00
vdso64 s390/vdso: filter out -mstack-guard and -mstack-size 2021-11-16 12:29:19 +01:00
.gitignore
abs_lowcore.c s390/mm: allocate Absolute Lowcore Area in decompressor 2023-01-13 14:15:06 +01:00
alternative.c s390/alternatives: remove padding generation code 2022-05-17 15:16:28 +02:00
asm-offsets.c s390/entry: sort out physical vs virtual pointers usage in sie64a 2022-10-26 14:27:41 +02:00
audit.c audit: add support for the openat2 syscall 2021-10-01 16:52:48 -04:00
audit.h
cache.c s390/cache: change type from unsigned long long to unsigned long 2023-01-25 20:51:09 +01:00
compat_audit.c audit: add support for the openat2 syscall 2021-10-01 16:52:48 -04:00
compat_linux.c
compat_linux.h s390/compat: cleanup compat_linux.h header file 2022-05-06 20:45:16 +02:00
compat_ptrace.h
compat_signal.c s390/vx: use simple assignments to access __vector128 members 2023-02-09 20:11:23 +01:00
cpcmd.c s390/cpcmd: use physical address for command and response 2021-10-26 15:21:28 +02:00
cpufeature.c s390/uvdevice: autoload module based on CPU facility 2022-07-19 16:18:49 +02:00
crash_dump.c s390/vx: use simple assignments to access __vector128 members 2023-02-09 20:11:23 +01:00
debug.c s390/debug: remove function type cast 2022-11-23 16:24:07 +01:00
diag.c s390/diag: make __diag8c_tmp_amode31 static 2023-02-06 11:13:54 +01:00
dis.c s390/disassembler: update opcode table 2021-12-16 19:58:07 +01:00
dumpstack.c exit: Add and use make_task_dead. 2021-12-13 12:04:45 -06:00
early_printk.c s390/sclp: remove unused sclp_early_printk_forced 2020-09-21 08:08:44 +02:00
early.c s390/setup: do not complain about parameters handled in decompressor 2023-02-27 15:29:36 +01:00
earlypgm.S s390: generate register offsets into pt_regs automatically 2022-05-25 11:46:02 +02:00
ebcdic.c
entry.h s390: move __amode31_base declaration to proper header file 2023-01-13 14:15:07 +01:00
entry.S s390/mcck: cleanup user process termination path 2023-02-28 13:19:05 +01:00
fpu.c s390/vx: add vx-insn.h wrapper include file 2022-12-06 16:18:23 +01:00
ftrace.c ftrace: Remove return value of ftrace_arch_modify_*() 2022-05-26 21:13:00 -04:00
ftrace.h s390: raise minimum supported machine generation to z10 2022-03-10 15:58:17 +01:00
guarded_storage.c
head64.S s390/early: fix sclp_early_sccb variable lifetime 2023-01-13 14:15:04 +01:00
idle.c s390 updates for 6.3 merge window 2023-02-21 15:09:17 -08:00
ima_arch.c
ipl_vmparm.c s390/cio: remove unused include linux/spinlock.h from cio.h 2021-07-27 09:39:13 +02:00
ipl.c s390/ipl: add loadparm parameter to eckd ipl/reipl data 2023-02-06 11:13:52 +01:00
irq.c s390/irq,idle: simplify idle check 2023-02-15 11:07:01 +01:00
jump_label.c jump_label: make initial NOP patching the special case 2022-06-24 09:48:55 +02:00
kdebugfs.c
kexec_elf.c
kexec_image.c
kprobes_insn_page.S s390/kprobes: move insn_page to text segment 2020-10-09 23:45:30 +02:00
kprobes.c s390/kprobes: replace kretprobe with rethook 2023-01-22 18:42:35 +01:00
kprobes.h s390/kprobes: define insn cache ops within private header file 2022-11-23 16:24:07 +01:00
lgr.c s390/lgr: use simple assignment instead of memcpy 2022-02-06 23:31:29 +01:00
machine_kexec_file.c s390/kexec: fix ipl report address for kdump 2023-01-10 14:37:02 +01:00
machine_kexec_reloc.c s390/kaslr: add support for R_390_JMP_SLOT relocation type 2020-05-20 10:13:27 +02:00
machine_kexec.c s390/mm: allocate Absolute Lowcore Area in decompressor 2023-01-13 14:15:06 +01:00
Makefile s390/cpum_cf: merge source files for CPU Measurement counter facility 2023-01-25 20:51:10 +01:00
mcount.S s390/kprobes: replace kretprobe with rethook 2023-01-22 18:42:35 +01:00
module.c jump_label: mips: move module NOP patching into arch code 2022-06-24 09:48:55 +02:00
nmi.c s390/mcck: cleanup user process termination path 2023-02-28 13:19:05 +01:00
nospec-branch.c s390: raise minimum supported machine generation to z10 2022-03-10 15:58:17 +01:00
nospec-sysfs.c s390: introduce nospec_uses_trampoline() 2021-10-26 15:21:29 +02:00
numa.c drivers/base/node: consolidate node device subsystem initialization in node_dev_init() 2022-03-22 15:57:10 -07:00
os_info.c s390/mm: allocate Absolute Lowcore Area in decompressor 2023-01-13 14:15:06 +01:00
perf_cpum_cf_events.c s390/cpumf: add new extended counter set for IBM z16 2022-05-16 10:58:33 +02:00
perf_cpum_cf.c s390 updates for 6.3 merge window 2023-02-21 15:09:17 -08:00
perf_cpum_sf.c s390/cpum_sf: use READ_ONCE_ALIGNED_128() instead of 128-bit cmpxchg 2023-02-28 13:19:05 +01:00
perf_event.c s390/stack: add union to reflect kvm stack slot usages 2022-06-01 12:03:17 +02:00
perf_pai_crypto.c perf/core: Add perf_sample_save_raw_data() helper 2023-01-18 11:57:19 +01:00
perf_pai_ext.c s390 updates for 6.3 merge window 2023-02-21 15:09:17 -08:00
perf_regs.c perf/arch: Remove perf_sample_data::regs_user_copy 2020-11-09 18:12:34 +01:00
process.c s390/mm: start kernel with DAT enabled 2023-01-13 14:15:05 +01:00
processor.c s390/cpufeature: rework to allow more than only hwcap bits 2022-07-19 16:18:49 +02:00
ptrace.c s390/vx: use simple assignments to access __vector128 members 2023-02-09 20:11:23 +01:00
reipl.S
relocate_kernel.S s390/kexec: set end-of-ipl flag in last diag308 call 2022-04-25 13:54:12 +02:00
rethook.c s390/rethook: add local rethook header file 2023-02-06 11:13:53 +01:00
rethook.h s390/rethook: add local rethook header file 2023-02-06 11:13:53 +01:00
runtime_instr.c s390/runtime_instrumentation: fix storage key handling 2020-08-17 13:17:10 +02:00
setup.c s390/mem_detect: do not truncate online memory ranges info 2023-02-14 11:45:40 +01:00
signal.c s390/vx: use simple assignments to access __vector128 members 2023-02-09 20:11:23 +01:00
smp.c s390/mcck: cleanup user process termination path 2023-02-28 13:19:05 +01:00
stacktrace.c s390/kprobes: replace kretprobe with rethook 2023-01-22 18:42:35 +01:00
sthyi.c s390/sthyi: use register pair instead of register asm 2021-06-18 16:41:22 +02:00
syscall.c s390: add support for BEAR enhancement facility 2021-10-26 15:21:29 +02:00
sysinfo.c s390/extable: move EX_TABLE define to asm-extable.h 2022-03-08 00:33:00 +01:00
text_amode31.S s390/tty3270: add support for diag 8c 2023-01-09 14:33:56 +01:00
time.c s390/stp: clock_delta should be signed 2022-05-11 14:40:57 +02:00
topology.c s390: remove invalid email address of Heiko Carstens 2022-02-06 23:31:29 +01:00
trace.c s390/ftrace: fix potential crashes when switching tracers 2020-04-22 16:20:55 +02:00
traps.c s390/traps: improve panic message for translation-specification exception 2022-03-27 22:18:38 +02:00
unwind_bc.c s390/unwind: avoid duplicated unwinding entries for kretprobes 2022-03-27 22:18:39 +02:00
uprobes.c s390: raise minimum supported machine generation to z10 2022-03-10 15:58:17 +01:00
uv.c KVM: s390: pv: avoid export before import if possible 2022-11-23 09:06:50 +00:00
vdso.c Random number generator updates for Linux 6.2-rc1. 2022-12-12 16:22:22 -08:00
vmlinux.lds.S s390 updates for 6.3 merge window 2023-02-21 15:09:17 -08:00
vtime.c cputime: remove cputime_to_nsecs fallback 2022-12-27 12:52:17 +01:00