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Rozycki" , Steven Rostedt , Jisheng Zhang , Masami Hiramatsu References: <20210313064149.29276-1-huangpei@loongson.cn> <20210313064149.29276-6-huangpei@loongson.cn> From: Sergei Shtylyov Message-ID: <14999d3c-ebfd-ed20-b87a-77e536a4a606@gmail.com> Date: Sat, 13 Mar 2021 12:26:09 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.8.0 MIME-Version: 1.0 In-Reply-To: <20210313064149.29276-6-huangpei@loongson.cn> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Stat-Signature: q5kuf89n3nyqf8kfo7qqfak15ktnkyny X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: D7420C4A6DC6 Received-SPF: none (gmail.com>: No applicable sender policy available) receiver=imf06; identity=mailfrom; envelope-from=""; helo=mail-lf1-f49.google.com; client-ip=209.85.167.49 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1615627573-603258 X-Bogosity: Ham, tests=bogofilter, spamicity=0.040629, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Hello! On 3/13/21 9:41 AM, Huang Pei wrote: > From: Jisheng Zhang > > On some architectures, the DYNAMIC_FTRACE_WITH_REGS is implemented by > gcc's -fpatchable-function-entry option. Take arm64 for example, arm64 > makes use of GCC -fpatchable-function-entry=2 option to insert two > nops. When the function is traced, the first nop will be modified to > the LR saver, then the second nop to "bl ". we need to > update ftrace_location() to recognise these two instructions as being > part of ftrace. To do this, we introduce FTRACE_IP_EXTENSION to let > ftrace_location search IP, IP + FTRACE_IP_EXTENSION range. > > Signed-off-by: Jisheng Zhang > Suggested-by: Steven Rostedt (VMware) > --- > include/linux/ftrace.h | 4 ++++ > kernel/trace/ftrace.c | 2 +- > 2 files changed, 5 insertions(+), 1 deletion(-) > > diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h > index 1bd3a0356ae4..c1e1fbde8a04 100644 > --- a/include/linux/ftrace.h > +++ b/include/linux/ftrace.h > @@ -20,6 +20,10 @@ > > #include > > +#ifndef FTRACE_IP_EXTENSION > +#define FTRACE_IP_EXTENSION 0 Inconsistent spacing between # and the value? [...] MBR, Sergei