From: Guo Ren <guoren@kernel.org>
To: Li Huafei <lihuafei1@huawei.com>
Cc: "Masami Hiramatsu" <mhiramat@kernel.org>,
"Palmer Dabbelt" <palmer@dabbelt.com>,
"Steven Rostedt" <rostedt@goodmis.org>,
"Ingo Molnar" <mingo@redhat.com>,
"Paul Walmsley" <paul.walmsley@sifive.com>,
"Albert Ou" <aou@eecs.berkeley.edu>,
"Naveen N . Rao" <naveen.n.rao@linux.ibm.com>,
"Anil S Keshavamurthy" <anil.s.keshavamurthy@intel.com>,
"David Miller" <davem@davemloft.net>,
jszhang@kernel.org, "Peter Zijlstra" <peterz@infradead.org>,
liaochang1@huawei.com, "Patrick Stählin" <me@packi.ch>,
"Pekka Enberg" <penberg@kernel.org>,
linux-riscv <linux-riscv@lists.infradead.org>,
"Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 1/2] riscv: ftrace: Fix the comments about the number of ftrace instruction
Date: Tue, 26 Apr 2022 14:22:18 +0800 [thread overview]
Message-ID: <CAJF2gTR6hL1DfaGpPqfVwtmCHaVYK1nz_-W-h_mye34UjeeAcg@mail.gmail.com> (raw)
In-Reply-To: <20220426015751.88582-1-lihuafei1@huawei.com>
On Tue, Apr 26, 2022 at 9:59 AM Li Huafei <lihuafei1@huawei.com> wrote:
>
> When DYNAMIC_FTRACE is enabled, we put four instructions in front of the
> function for ftrace use, not five.
>
> Signed-off-by: Li Huafei <lihuafei1@huawei.com>
> ---
> arch/riscv/kernel/ftrace.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/riscv/kernel/ftrace.c b/arch/riscv/kernel/ftrace.c
> index 4716f4cdc038..63f457650fa4 100644
> --- a/arch/riscv/kernel/ftrace.c
> +++ b/arch/riscv/kernel/ftrace.c
> @@ -73,7 +73,7 @@ static int __ftrace_modify_call(unsigned long hook_pos, unsigned long target,
> }
>
> /*
> - * Put 5 instructions with 16 bytes at the front of function within
> + * Put 4 instructions with 16 bytes at the front of function within
Yeah, 5 instructions are for mcount, -fpatchable-function-entry=8
cause 8 16bit instructions.
Fixes: afc76b8b8011 ("riscv: Using PATCHABLE_FUNCTION_ENTRY instead of MCOUNT")
I recommend just delete "4 instructions with"
- * Put 5 instructions with 16 bytes at the front of function within
- * patchable function entry nops' area.
+ * Put 16 bytes at the front of the function within the patchable
+ * function entry nops' area.
> * patchable function entry nops' area.
> *
> * 0: REG_S ra, -SZREG(sp)
> --
> 2.17.1
>
--
Best Regards
Guo Ren
ML: https://lore.kernel.org/linux-csky/
next prev parent reply other threads:[~2022-04-26 6:22 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-26 1:57 [PATCH 1/2] riscv: ftrace: Fix the comments about the number of ftrace instruction Li Huafei
2022-04-26 1:57 ` [PATCH 2/2] riscv: kprobe: Allow coexistence of ftrace and kprobe Li Huafei
2022-04-26 8:01 ` Guo Ren
2022-04-26 8:16 ` Guo Ren
2022-04-29 9:15 ` Li Huafei
2022-04-30 7:08 ` Guo Ren
2022-05-09 6:51 ` Li Huafei
2022-04-26 6:22 ` Guo Ren [this message]
2022-04-26 8:52 ` [PATCH 1/2] riscv: ftrace: Fix the comments about the number of ftrace instruction Li Huafei
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