linux-kernel - Re: [PATCH v2] arm64: ftrace: Fix to enable syscall events on arm64

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Message-Id: <20181130071309.dfa552d2bcd7283788e5563e@kernel.org>
Date:   Fri, 30 Nov 2018 07:13:09 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Catalin Marinas <catalin.marinas@....com>
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        Naresh Kamboju <naresh.kamboju@...aro.org>,
        Will Deacon <will.deacon@....com>,
        Mark Rutland <mark.rutland@....com>,
        Ingo Molnar <mingo@...hat.com>,
        Masami Hiramatsu <masami.hiramatsu@...aro.org>,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH v2] arm64: ftrace: Fix to enable syscall events on arm64

On Thu, 29 Nov 2018 16:53:30 +0000
Catalin Marinas <catalin.marinas@....com> wrote:

> On Thu, Nov 29, 2018 at 02:39:33PM +0900, Masami Hiramatsu wrote:
> > Since commit 4378a7d4be30 ("arm64: implement syscall wrappers")
> > introduced "__arm64_" prefix to all syscall wrapper symbols in
> > sys_call_table, syscall tracer can not find corresponding
> > metadata from syscall name. In the result, we have no syscall
> > ftrace events on arm64 kernel, and some bpf testcases are failed
> > on arm64.
> > 
> > To fix this issue, this introduces custom
> > arch_syscall_match_sym_name() which skips first 8 bytes when
> > comparing the syscall and symbol names.
> > 
> > Fixes: 4378a7d4be30 ("arm64: implement syscall wrappers")
> > Reported-by: Naresh Kamboju <naresh.kamboju@...aro.org>
> > Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
> > Acked-by: Will Deacon <will.deacon@....com>
> > Tested-by: Naresh Kamboju <naresh.kamboju@...aro.org>
> > Cc: stable@...r.kernel.org
> 
> Queued for 4.20. Thanks.

Thank you Catalin!

> 
> -- 
> Catalin


-- 
Masami Hiramatsu <mhiramat@...nel.org>