Martin Kaiser b0d7f5f0c9 riscv: trace: fix snapshot deadlock with sbi ecall ... If sbi_ecall.c's functions are traceable, echo "__sbi_ecall:snapshot" > /sys/kernel/tracing/set_ftrace_filter may get the kernel into a deadlock. (Functions in sbi_ecall.c are excluded from tracing if CONFIG_RISCV_ALTERNATIVE_EARLY is set.) __sbi_ecall triggers a snapshot of the ringbuffer. The snapshot code raises an IPI interrupt, which results in another call to __sbi_ecall and another snapshot... All it takes to get into this endless loop is one initial __sbi_ecall. On RISC-V systems without SSTC extension, the clock events in timer-riscv.c issue periodic sbi ecalls, making the problem easy to trigger. Always exclude the sbi_ecall.c functions from tracing to fix the potential deadlock. sbi ecalls can easiliy be logged via trace events, excluding ecall functions from function tracing is not a big limitation. Signed-off-by: Martin Kaiser <martin@kaiser.cx> Link: https://patch.msgid.link/20251223135043.1336524-1-martin@kaiser.cx Signed-off-by: Paul Walmsley <pjw@kernel.org>		2026-01-07 13:25:56 -07:00
..
compat_vdso	…
pi	riscv: pi: use 'targets' instead of extra-y in Makefile	2025-09-18 08:20:56 -06:00
probes	riscv: kprobes: Fix probe address validation	2025-10-09 19:36:45 -06:00
tests	riscv: fix KUnit test_kprobes crash when building with Clang	2025-12-30 20:10:52 -07:00
vdso	riscv: hwprobe: Fix stale vDSO data for late-initialized keys at boot	2025-10-17 22:23:11 -06:00
vendor_extensions	riscv: hwprobe: Add MIPS vendor extension probing	2025-09-19 10:33:56 -06:00
.gitignore	…
Makefile	riscv: trace: fix snapshot deadlock with sbi ecall	2026-01-07 13:25:56 -07:00
Makefile.syscalls	…
acpi.c	RISC-V: ACPI: enable parsing the BGRT table	2025-09-18 08:21:45 -06:00
acpi_numa.c	…
alternative.c	riscv: errata: Fix the PAUSE Opcode for MIPS P8700	2025-09-19 10:33:56 -06:00
asm-offsets.c	arch: Add the macro COMPILE_OFFSETS to all the asm-offsets.c	2025-09-25 09:57:15 +02:00
bugs.c	riscv: Add ghostwrite vulnerability	2025-01-18 12:33:39 -08:00
cacheinfo.c	riscv: cacheinfo: Use of_property_present() for non-boolean properties	2025-02-14 13:04:20 -08:00
cfi.c	cfi: Move BPF CFI types and helpers to generic code	2025-07-31 18:23:53 -07:00
compat_signal.c	…
compat_syscall_table.c	…
copy-unaligned.S	…
copy-unaligned.h	RISC-V: Report vector unaligned access speed hwprobe	2024-10-18 12:38:34 -07:00
cpu-hotplug.c	RISC-V: clear hot-unplugged cores from all task mm_cpumasks to avoid rfence errors	2025-10-09 19:36:45 -06:00
cpu.c	RISC-V: Don't print details of CPUs disabled in DT	2025-10-17 22:02:21 -06:00
cpu_ops.c	…
cpu_ops_sbi.c	riscv: cpu_ops_sbi: smp_processor_id() returns int, not unsigned int	2026-01-07 13:03:16 -07:00
cpu_ops_spinwait.c	…
cpufeature.c	riscv: cpufeature: Fix Zk bundled extension missing Zknh	2026-01-05 17:40:44 -07:00
crash_dump.c	…
crash_save_regs.S	…
efi-header.S	include: pe.h: Fix PE definitions	2025-05-21 16:46:37 +02:00
efi.c	…
entry.S	riscv: entry: fix typo in comment 'instruciton' -> 'instruction'	2025-10-09 19:36:45 -06:00
fpu.S	RISC-V: Replace RISCV_MISALIGNED with RISCV_SCALAR_MISALIGNED	2024-10-18 12:38:32 -07:00
ftrace.c	riscv: ftrace: Properly acquire text_mutex to fix a race condition	2025-07-16 08:21:47 -07:00
head.S	RISC-V: KVM: Remove scounteren initialization	2025-05-21 09:34:55 +05:30
head.h	…
hibernate-asm.S	…
hibernate.c	…
image-vars.h	…
irq.c	riscv: Helper to parse hart index	2025-06-26 16:06:40 +02:00
jump_label.c	riscv: Move nop definition to insn-def.h	2025-03-20 09:14:42 +00:00
kernel_mode_fpu.c	…
kernel_mode_vector.c	riscv: vector: Support xtheadvector save/restore	2025-01-18 12:33:33 -08:00
kexec_elf.c	riscv: kexec: Initialize kexec_buf struct	2025-09-05 15:31:28 -06:00
kexec_image.c	riscv: kexec_image: Fix dead link to boot-image-header.rst	2026-01-05 17:54:11 -07:00
kexec_relocate.S	…
kgdb.c	riscv: KGDB: Replace deprecated strcpy in kgdb_arch_handle_qxfer_pkt	2025-10-27 23:30:01 -06:00
machine_kexec.c	kexec: Consolidate machine_kexec_mask_interrupts() implementation	2024-12-11 20:32:34 +01:00
machine_kexec_file.c	riscv: Strengthen duplicate and inconsistent definition of RV_X()	2025-09-16 16:28:30 -06:00
mcount-dyn.S	riscv: ftrace: support direct call using call_ops	2025-06-05 11:09:31 -07:00
mcount.S	riscv: fgraph: Fix stack layout to match __arch_ftrace_regs argument of ftrace_return_to_handler	2025-03-19 12:03:25 +00:00
module-sections.c	riscv: Fix memory leak in module_frob_arch_sections()	2025-10-27 11:40:44 -06:00
module.c	riscv: module: Fix out-of-bounds relocation access	2025-04-14 13:07:07 +00:00
paravirt.c	…
patch.c	asm-generic: introduce text-patching.h	2024-11-07 14:25:15 -08:00
perf_callchain.c	The biggest change here is eliminating the awful idea that KVM had, of	2024-11-23 16:00:50 -08:00
perf_regs.c	…
process.c	arch: copy_thread: pass clone_flags as u64	2025-09-01 15:31:34 +02:00
ptrace.c	riscv: ptrace: Optimize the allocation of vector regset	2025-11-19 09:19:28 -07:00
reset.c	…
return_address.c	…
riscv_ksyms.c	…
sbi-ipi.c	…
sbi.c	riscv: sbi: Prefer SRST shutdown over legacy	2025-11-16 10:37:27 -07:00
sbi_ecall.c	…
setup.c	riscv: acpi: avoid errors caused by probing DT devices when ACPI is used	2025-10-09 19:36:45 -06:00
signal.c	riscv: signal: abstract header saving for setup_sigcontext	2025-12-19 00:18:33 -07:00
smp.c	riscv: Register IPI IRQs with unique names	2025-10-17 22:00:29 -06:00
smpboot.c	RISC-V: Enable HOTPLUG_PARALLEL for secondary CPUs	2025-11-19 09:19:27 -07:00
soc.c	…
stacktrace.c	riscv: stacktrace: Disable KASAN checks for non-current tasks	2025-10-27 11:40:43 -06:00
suspend.c	riscv: Add stimecmp save and restore	2025-03-18 12:59:03 +00:00
suspend_entry.S	…
sys_hwprobe.c	riscv: hwprobe: export Zilsd and Zclsd ISA extensions	2025-12-19 00:22:30 -07:00
sys_riscv.c	riscv: mmap(): use unsigned offset type in riscv_sys_mmap	2025-09-18 08:19:47 -06:00
syscall_table.c	…
time.c	…
traps.c	riscv: Sanitize syscall table indexing under speculation	2025-12-30 19:57:55 -07:00
traps_misaligned.c	riscv: Move all duplicate insn parsing macros into asm/insn.h	2025-09-16 16:29:07 -06:00
unaligned_access_speed.c	riscv: hwprobe: Fix stale vDSO data for late-initialized keys at boot	2025-10-17 22:23:11 -06:00
vdso.c	riscv: enable mseal sysmap for RV64	2025-06-05 14:03:08 -07:00
vec-copy-unaligned.S	riscv: Fix the __riscv_copy_vec_words_unaligned implementation	2025-03-18 13:37:27 +00:00
vector.c	riscv: ptrace: Optimize the allocation of vector regset	2025-11-19 09:19:28 -07:00
vendor_extensions.c	riscv: Add xmipsexectl as a vendor extension	2025-09-18 20:36:00 -06:00
vmcore_info.c	…
vmlinux-xip.lds.S	…
vmlinux.lds.S	riscv: Add runtime constant support	2025-03-20 09:15:03 +00:00