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

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Message-ID: <20181129165329.GC22027@arrakis.emea.arm.com>
Date:   Thu, 29 Nov 2018 16:53:30 +0000
From:   Catalin Marinas <catalin.marinas@....com>
To:     Masami Hiramatsu <mhiramat@...nel.org>
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, 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.

-- 
Catalin