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From:   Namhyung Kim <namhyung@kernel.org>
Date:   Sun, 5 Nov 2023 19:55:44 -0800
Message-ID: <CAM9d7chKHASNE2BbL-6G7KJ-SwKMGXW+wujLsqiB+pFUPxJ2kA@mail.gmail.com>
Subject: Re: [PATCH v4 07/53] tools api fs: Avoid reading whole file for a 1
 byte bool
To:     Ian Rogers <irogers@google.com>
Cc:     Peter Zijlstra <peterz@infradead.org>,
        Ingo Molnar <mingo@redhat.com>,
        Arnaldo Carvalho de Melo <acme@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
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        Jiri Olsa <jolsa@kernel.org>,
        Adrian Hunter <adrian.hunter@intel.com>,
        Nick Terrell <terrelln@fb.com>,
        Kan Liang <kan.liang@linux.intel.com>,
        Andi Kleen <ak@linux.intel.com>,
        Kajol Jain <kjain@linux.ibm.com>,
        Athira Rajeev <atrajeev@linux.vnet.ibm.com>,
        Huacai Chen <chenhuacai@kernel.org>,
        Masami Hiramatsu <mhiramat@kernel.org>,
        Vincent Whitchurch <vincent.whitchurch@axis.com>,
        "Steinar H. Gunderson" <sesse@google.com>,
        Liam Howlett <liam.howlett@oracle.com>,
        Miguel Ojeda <ojeda@kernel.org>,
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        James Clark <james.clark@arm.com>,
        K Prateek Nayak <kprateek.nayak@amd.com>,
        Sean Christopherson <seanjc@google.com>,
        Leo Yan <leo.yan@linaro.org>,
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        German Gomez <german.gomez@arm.com>,
        Changbin Du <changbin.du@huawei.com>,
        Paolo Bonzini <pbonzini@redhat.com>, Li Dong <lidong@vivo.com>,
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        liuwenyu <liuwenyu7@huawei.com>, linux-kernel@vger.kernel.org,
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On Thu, Nov 2, 2023 at 10:58 AM Ian Rogers <irogers@google.com> wrote:
>
> sysfs__read_bool used the first byte from a fully read file into a
> string. It then looked at the first byte's value. Avoid doing this and
> just read the first byte.
>
> Signed-off-by: Ian Rogers <irogers@google.com>
> ---
>  tools/lib/api/fs/fs.c | 18 +++++++++---------
>  1 file changed, 9 insertions(+), 9 deletions(-)
>
> diff --git a/tools/lib/api/fs/fs.c b/tools/lib/api/fs/fs.c
> index 496812b5f1d2..4c35a689d1fc 100644
> --- a/tools/lib/api/fs/fs.c
> +++ b/tools/lib/api/fs/fs.c
> @@ -447,15 +447,16 @@ int sysfs__read_str(const char *entry, char **buf, size_t *sizep)
>
>  int sysfs__read_bool(const char *entry, bool *value)
>  {
> -       char *buf;
> -       size_t size;
> -       int ret;
> +       struct io io;
> +       char bf[16];
> +       int ret = 0;
>
> -       ret = sysfs__read_str(entry, &buf, &size);
> -       if (ret < 0)
> -               return ret;
> +       io.fd = open(entry, O_RDONLY);

The entry is a name in sysfs, so you need to get the full name.

Thanks,
Namhyung


> +       if (io.fd < 0)
> +               return -errno;
>
> -       switch (buf[0]) {
> +       io__init(&io, io.fd, bf, sizeof(bf));
> +       switch (io__get_char(&io)) {
>         case '1':
>         case 'y':
>         case 'Y':
> @@ -469,8 +470,7 @@ int sysfs__read_bool(const char *entry, bool *value)
>         default:
>                 ret = -1;
>         }
> -
> -       free(buf);
> +       close(io.fd);
>
>         return ret;
>  }
> --
> 2.42.0.869.gea05f2083d-goog
>