Palmer Dabbelt ec6311919e Merge patch series "riscv: Optimize function trace" ... guoren@kernel.org <guoren@kernel.org> says: From: Guo Ren <guoren@linux.alibaba.com> The previous ftrace detour implementation fc76b8b8011 ("riscv: Using PATCHABLE_FUNCTION_ENTRY instead of MCOUNT") contain three problems. - The most horrible bug is preemption panic which found by Andy [1]. Let's disable preemption for ftrace first, and Andy could continue the ftrace preemption work. - The "-fpatchable-function-entry= CFLAG" wasted code size !RISCV_ISA_C. - The ftrace detour implementation wasted code size. - When livepatching, the trampoline (ftrace_regs_caller) would not return to <func_prolog+12> but would rather jump to the new function. So, "REG_L ra, -SZREG(sp)" would not run and the original return address would not be restored. The kernel is likely to hang or crash as a result. (Found by Evgenii Shatokhin [4]) [Palmer: The first three patches in this series are pretty concrete fixes, so I'm pulling them ahead of the rest of the series.] * b4-shazam-merge: riscv: ftrace: Reduce the detour code size to half riscv: ftrace: Remove wasted nops for !RISCV_ISA_C riscv: ftrace: Fixup panic by disabling preemption Link: https://lore.kernel.org/r/20230112090603.1295340-1-guoren@kernel.org Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>		2023-02-15 10:59:54 -08:00
..
boot	RISC-V: kbuild: convert all use of SOC_FOO to ARCH_FOO	2022-12-27 18:01:40 +00:00
configs	RISC-V Patches for the 6.2 Merge Window, Part 1	2022-12-14 15:23:49 -08:00
errata	riscv: Fix early alternative patching	2023-02-14 16:10:35 -08:00
include	Merge patch series "riscv: Optimize function trace"	2023-02-15 10:59:54 -08:00
kernel	Merge patch series "riscv: Optimize function trace"	2023-02-15 10:59:54 -08:00
kvm	riscv: KVM: Switch has_svinval() to riscv_has_extension_unlikely()	2023-01-31 23:29:44 -08:00
lib	riscv: Fix Zbb alternative IDs	2023-02-14 16:10:36 -08:00
mm	RISC-V Patches for the 6.2 Merge Window, Part 1	2022-12-14 15:23:49 -08:00
net	riscv, bpf: Emit fixed-length instructions for BPF_PSEUDO_FUNC	2022-12-06 20:59:27 +01:00
purgatory	RISC-V: add infrastructure to allow different str* implementations	2023-01-31 11:43:23 -08:00
Kbuild	riscv: move errata/ and kvm/ builds to arch/riscv/Kbuild	2022-06-01 22:26:32 -07:00
Kconfig	Merge patch series "riscv: Optimize function trace"	2023-02-15 10:59:54 -08:00
Kconfig.debug
Kconfig.erratas	drivers/perf: riscv_pmu_sbi: add support for PMU variant on T-Head C9xx cores	2022-10-27 14:35:20 -07:00
Kconfig.socs	RISC-V: Kconfig: Remove trailing whitespace	2023-01-24 18:09:12 -08:00
Makefile	Merge patch series "riscv: Optimize function trace"	2023-02-15 10:59:54 -08:00