linux-kernel - Re: [PATCH -fixes] riscv: Fix ftrace syscall handling which are now prefixed with __riscv

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Message-ID: <87r0mb3p95.fsf@all.your.base.are.belong.to.us>
Date:   Wed, 04 Oct 2023 07:55:50 +0200
From:   Björn Töpel <bjorn@...nel.org>
To:     Alexandre Ghiti <alexghiti@...osinc.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Kees Cook <keescook@...omium.org>,
        linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
        linux-riscv@...ts.infradead.org
Cc:     Alexandre Ghiti <alexghiti@...osinc.com>
Subject: Re: [PATCH -fixes] riscv: Fix ftrace syscall handling which are now
 prefixed with __riscv_

Alexandre Ghiti <alexghiti@...osinc.com> writes:

> ftrace creates entries for each syscall in the tracefs but has failed
> since commit 08d0ce30e0e4 ("riscv: Implement syscall wrappers") which
> prefixes all riscv syscalls with __riscv_.
>
> So fix this by implementing arch_syscall_match_sym_name() which allows us
> to ignore this prefix.
>
> And also ignore compat syscalls like x86/arm64 by implementing
> arch_trace_is_compat_syscall().
>
> Fixes: 08d0ce30e0e4 ("riscv: Implement syscall wrappers")
> Signed-off-by: Alexandre Ghiti <alexghiti@...osinc.com>

This fix does the BPF test suite happier!

Tested-by: Björn Töpel <bjorn@...osinc.com>