From: John Stultz <john.stultz@linaro.org>
To: Bamvor Zhang Jian <bamvor.zhangjian@linaro.org>
Cc: Arnd Bergmann <arnd@arndb.de>,
Thomas Gleixner <tglx@linutronix.de>,
y2039@lists.linaro.org, lkml <linux-kernel@vger.kernel.org>,
Baolin Wang <baolin.wang@linaro.org>
Subject: Re: [RFC PATCH v2 1/4] y2038: add 64bit time_t support in timeval for 32bit architecture
Date: Wed, 8 Jul 2015 13:09:55 -0700 [thread overview]
Message-ID: <CALAqxLU0XnQfmPLOVqRtv0z_jU6kDFdK6rkfBNh11Ri-q5gPqw@mail.gmail.com> (raw)
In-Reply-To: <1435587807-10008-2-git-send-email-bamvor.zhangjian@linaro.org>
On Mon, Jun 29, 2015 at 7:23 AM, Bamvor Zhang Jian
<bamvor.zhangjian@linaro.org> wrote:
> +int get_timeval64(struct timeval64 *tv,
> + const struct __kernel_timeval __user *utv)
> +{
> + struct __kernel_timeval ktv;
> + int ret;
> +
> + ret = copy_from_user(&ktv, utv, sizeof(ktv));
> + if (ret)
> + return -EFAULT;
> +
> + tv->tv_sec = ktv.tv_sec;
> + if (!IS_ENABLED(CONFIG_64BIT)
> +#ifdef CONFIG_COMPAT
> + || is_compat_task()
> +#endif
These sorts of ifdefs are to be avoided inside of functions.
Instead, it seems is_compat_task() should be defined to 0 in the
!CONFIG_COMPAT case, so you can avoid the ifdefs and the compiler can
still optimize it out.
Otherwise this looks similar to a patch Baolin (cc'ed) has been working on.
thanks
-john
next prev parent reply other threads:[~2015-07-08 20:10 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-29 14:23 [RFC PATCH v2 0/4] Convert ppdev to y2038 safe Bamvor Zhang Jian
2015-06-29 14:23 ` [RFC PATCH v2 1/4] y2038: add 64bit time_t support in timeval for 32bit architecture Bamvor Zhang Jian
2015-07-08 20:09 ` John Stultz [this message]
2015-07-09 9:02 ` Bamvor Zhang Jian
2015-07-09 10:26 ` Arnd Bergmann
2015-07-15 3:18 ` Bamvor Zhang Jian
2015-07-15 9:33 ` Arnd Bergmann
2015-06-29 14:23 ` [RFC PATCH v2 2/4] time64: add timeval64 helper for compat syscalls Bamvor Zhang Jian
2015-06-29 14:23 ` [RFC PATCH v2 3/4] ppdev: add compat ioctl Bamvor Zhang Jian
2015-07-08 20:17 ` John Stultz
2015-07-08 21:28 ` [Y2038] " Arnd Bergmann
2015-06-29 14:23 ` [RFC PATCH v2 4/4] y2038: convert ppdev to 2038 safe Bamvor Zhang Jian
2015-07-08 21:34 ` Arnd Bergmann
2015-07-08 21:36 ` Arnd Bergmann
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=CALAqxLU0XnQfmPLOVqRtv0z_jU6kDFdK6rkfBNh11Ri-q5gPqw@mail.gmail.com \
--to=john.stultz@linaro.org \
--cc=arnd@arndb.de \
--cc=bamvor.zhangjian@linaro.org \
--cc=baolin.wang@linaro.org \
--cc=linux-kernel@vger.kernel.org \
--cc=tglx@linutronix.de \
--cc=y2039@lists.linaro.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).