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Message-ID: <20171227021255.sahkcpgyzohl5brs@ast-mbp> Date: Tue, 26 Dec 2017 18:12:56 -0800 From: Alexei Starovoitov <alexei.starovoitov@...il.com> To: Masami Hiramatsu <mhiramat@...nel.org> Cc: Alexei Starovoitov <ast@...com>, Josef Bacik <jbacik@...com>, rostedt@...dmis.org, mingo@...hat.com, davem@...emloft.net, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, ast@...nel.org, kernel-team@...com, daniel@...earbox.net, linux-btrfs@...r.kernel.org, darrick.wong@...cle.com, Josef Bacik <josef@...icpanda.com>, Akinobu Mita <akinobu.mita@...il.com> Subject: Re: [RFC PATCH bpf-next v2 4/4] error-injection: Support fault injection framework On Tue, Dec 26, 2017 at 04:48:25PM +0900, Masami Hiramatsu wrote: > Support in-kernel fault-injection framework via debugfs. > This allows you to inject a conditional error to specified > function using debugfs interfaces. > > Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org> > --- > Documentation/fault-injection/fault-injection.txt | 5 + > kernel/Makefile | 1 > kernel/fail_function.c | 169 +++++++++++++++++++++ > lib/Kconfig.debug | 10 + > 4 files changed, 185 insertions(+) > create mode 100644 kernel/fail_function.c > > diff --git a/Documentation/fault-injection/fault-injection.txt b/Documentation/fault-injection/fault-injection.txt > index 918972babcd8..6243a588dd71 100644 > --- a/Documentation/fault-injection/fault-injection.txt > +++ b/Documentation/fault-injection/fault-injection.txt > @@ -30,6 +30,11 @@ o fail_mmc_request > injects MMC data errors on devices permitted by setting > debugfs entries under /sys/kernel/debug/mmc0/fail_mmc_request > > +o fail_function > + > + injects error return on specific functions by setting debugfs entries > + under /sys/kernel/debug/fail_function. No boot option supported. I like it. Could you document it a bit better? In particular retval is configurable, but without an example no one will be able to figure out how to use it. I think you can drop RFC tag from the next version of these patches. Thanks!
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