| Message ID | 20230324033342.3177979-2-suagrfillet@gmail.com (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | riscv: Optimize function trace | expand |
Song Shuai <suagrfillet@gmail.com> writes: > In RISC-V, -fpatchable-function-entry option is used to support > dynamic ftrace in this commit afc76b8b8011 ("riscv: Using > PATCHABLE_FUNCTION_ENTRY instead of MCOUNT"). So recordmcount > don't have to be called to create the __mcount_loc section before > the vmlinux linking. > > Here selects FTRACE_MCOUNT_USE_PATCHABLE_FUNCTION_ENTRY to tell > Makefile not to run recordmcount. > > Link: https://lore.kernel.org/linux-riscv/CAAYs2=j3Eak9vU6xbAw0zPuoh00rh8v5C2U3fePkokZFibWs2g@mail.gmail.com/T/#t > Link: https://lore.kernel.org/linux-riscv/Y4jtfrJt+%2FQ5nMOz@spud/ > Signed-off-by: Song Shuai <suagrfillet@gmail.com> > Tested-by: Guo Ren <guoren@kernel.org> > Signed-off-by: Guo Ren <guoren@kernel.org> Acked-by: Björn Töpel <bjorn@rivosinc.com>
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index c5e42cc37604..93d4817c9d73 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -56,6 +56,7 @@ config RISCV select COMMON_CLK select CPU_PM if CPU_IDLE select EDAC_SUPPORT + select FTRACE_MCOUNT_USE_PATCHABLE_FUNCTION_ENTRY if DYNAMIC_FTRACE select GENERIC_ARCH_TOPOLOGY select GENERIC_ATOMIC64 if !64BIT select GENERIC_CLOCKEVENTS_BROADCAST if SMP
In RISC-V, -fpatchable-function-entry option is used to support dynamic ftrace in this commit afc76b8b8011 ("riscv: Using PATCHABLE_FUNCTION_ENTRY instead of MCOUNT"). So recordmcount don't have to be called to create the __mcount_loc section before the vmlinux linking. Here selects FTRACE_MCOUNT_USE_PATCHABLE_FUNCTION_ENTRY to tell Makefile not to run recordmcount. Link: https://lore.kernel.org/linux-riscv/CAAYs2=j3Eak9vU6xbAw0zPuoh00rh8v5C2U3fePkokZFibWs2g@mail.gmail.com/T/#t Link: https://lore.kernel.org/linux-riscv/Y4jtfrJt+%2FQ5nMOz@spud/ Signed-off-by: Song Shuai <suagrfillet@gmail.com> Tested-by: Guo Ren <guoren@kernel.org> Signed-off-by: Guo Ren <guoren@kernel.org> --- arch/riscv/Kconfig | 1 + 1 file changed, 1 insertion(+)