linux-kernel - Re: [PATCH v3] Add time_is_after_jiffies and others which compare with jiffies

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Message-ID: <a8e1da0803102151y125f497x4d7fd57374c59b29@mail.gmail.com>
Date:	Tue, 11 Mar 2008 12:51:29 +0800
From:	"Dave Young" <hidave.darkstar@...il.com>
To:	"KOSAKI Motohiro" <kosaki.motohiro@...fujitsu.com>
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	hannes@...urebad.de, alan@...rguk.ukuu.org.uk
Subject: Re: [PATCH v3] Add time_is_after_jiffies and others which compare with jiffies

On Tue, Mar 11, 2008 at 11:17 AM, KOSAKI Motohiro
<kosaki.motohiro@...fujitsu.com> wrote:
> Hi
>
>  Why don't you make jiffies_64 stuff?

Actually, I greped the kernel source, and found none of time_*64 usage.

After grep again, I found a missed one in:
arch/x86/kernel/cpu/mcheck/therm_throt.c

        if (time_before64(tmp_jiffs, __get_cpu_var(next_check)))
                return 0;

Does it really need time_before64 here?

If it does need then I wonder whether the other 64 macros may be
removed, or just to add a time_is_before64_jiffies

>
>
>
>
>
>  > Most of time_after like macros usages just compare jiffies and
>  > another number, so here add some time_is_* macros for convenience.
>  >
>  > Signed-off-by: Dave Young <hidave.darkstar@...il.com>
>  >
>  > ---
>  > include/linux/jiffies.h |   16 ++++++++++++++++
>  > 1 file changed, 16 insertions(+)
>  >
>  > diff -upr linux/include/linux/jiffies.h linux.new/include/linux/jiffies.h
>  > --- linux/include/linux/jiffies.h     2008-03-07 10:40:04.000000000 +0800
>  > +++ linux.new/include/linux/jiffies.h 2008-03-10 09:11:36.000000000 +0800
>  > @@ -135,6 +135,22 @@ static inline u64 get_jiffies_64(void)
>  >  #define time_before_eq64(a,b)        time_after_eq64(b,a)
>  >
>  >  /*
>  > + * These four macros compare jiffies and 'a' for convenience.
>  > + */
>  > +
>  > +/* time_is_before_jiffies(a) return true if a is before jiffies */
>  > +#define time_is_before_jiffies(a) time_after(jiffies, a)
>  > +
>  > +/* time_is_after_jiffies(a) return true if a is after jiffies */
>  > +#define time_is_after_jiffies(a) time_before(jiffies, a)
>  > +
>  > +/* time_is_before_eq_jiffies(a) return true if a is before or equal to jiffies*/
>  > +#define time_is_before_eq_jiffies(a) time_after_eq(jiffies, a)
>  > +
>  > +/* time_is_after_eq_jiffies(a) return true if a is after or equal to jiffies*/
>  > +#define time_is_after_eq_jiffies(a) time_before_eq(jiffies, a)
>  > +
>  > +/*
>  >   * Have the 32 bit jiffies value wrap 5 minutes after boot
>  >   * so jiffies wrap bugs show up earlier.
>  >   */
>  > --
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>
>
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