Chen Huang eac2f3059e riscv: stacktrace: fix the riscv stacktrace when CONFIG_FRAME_POINTER enabled ... As [1] and [2] said, the arch_stack_walk should not to trace itself, or it will leave the trace unexpectedly when called. The example is when we do "cat /sys/kernel/debug/page_owner", all pages' stack is the same. arch_stack_walk+0x18/0x20 stack_trace_save+0x40/0x60 register_dummy_stack+0x24/0x5e init_page_owner+0x2e So we use __builtin_frame_address(1) as the first frame to be walked. And mark the arch_stack_walk() noinline. We found that pr_cont will affact pages' stack whose task state is RUNNING when testing "echo t > /proc/sysrq-trigger". So move the place of pr_cont and mark the function dump_backtrace() noinline. Also we move the case when task == NULL into else branch, and test for it in "echo c > /proc/sysrq-trigger". [1] https://lore.kernel.org/lkml/20210319184106.5688-1-mark.rutland@arm.com/ [2] https://lore.kernel.org/lkml/20210317142050.57712-1-chenjun102@huawei.com/ Signed-off-by: Chen Huang <chenhuang5@huawei.com> Fixes: 5d8544e2d0 ("RISC-V: Generic library routines and assembly") Cc: stable@vger.kernel.org Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>		2021-05-22 18:59:20 -07:00
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boot	RISC-V Patches for the 5.13 Merge Window, Part 1	2021-05-06 09:24:18 -07:00
configs	RISC-V: Enable Microchip PolarFire ICICLE SoC	2021-04-26 08:31:32 -07:00
errata	riscv: sifive: Apply errata "cip-1200" patch	2021-04-26 08:24:58 -07:00
include	riscv: Consistify protect_kernel_linear_mapping_text_rodata() use	2021-05-06 09:40:15 -07:00
kernel	riscv: stacktrace: fix the riscv stacktrace when CONFIG_FRAME_POINTER enabled	2021-05-22 18:59:20 -07:00
lib	riscv: Add support for function error injection	2021-01-14 15:09:09 -08:00
mm	riscv: Consistify protect_kernel_linear_mapping_text_rodata() use	2021-05-06 09:40:15 -07:00
net	riscv: bpf: Avoid breaking W^X	2021-04-26 08:25:14 -07:00
Kbuild	riscv: Allow device trees to be built into the kernel	2020-05-18 11:38:05 -07:00
Kconfig	RISC-V Patches for the 5.13 Merge Window, Part 1	2021-05-06 09:24:18 -07:00
Kconfig.debug	RISC-V: Remove EARLY_PRINTK support	2018-12-17 10:23:46 -08:00
Kconfig.erratas	riscv: enable SiFive errata CIP-453 and CIP-1200 Kconfig only if CONFIG_64BIT=y	2021-05-06 09:40:13 -07:00
Kconfig.socs	RISC-V Patches for the 5.13 Merge Window, Part 1	2021-05-06 09:24:18 -07:00
Makefile	RISC-V: enable XIP	2021-04-26 08:31:28 -07:00