From: Thomas Gleixner <tglx@linutronix.de>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Ingo Molnar <mingo@elte.hu>,
"bugme-daemon@kernel-bugs.osdl.org"
<bugme-daemon@bugzilla.kernel.org>,
linux-kernel@vger.kernel.org, malitzke@metronets.com,
Linus Torvalds <torvalds@linux-foundation.org>
Subject: Re: [Bug 8501] udivdi3 absence with gcc-4.3.0 on kernels 2.6.20.11 & 2.6.22.-rc1
Date: Sat, 19 May 2007 01:12:23 +0200 [thread overview]
Message-ID: <1179529943.12981.106.camel@chaos> (raw)
In-Reply-To: <20070518152935.b5a4b3bf.akpm@linux-foundation.org>
On Fri, 2007-05-18 at 15:29 -0700, Andrew Morton wrote:
> We use the above idiom in several places. A suitable fix might be to hunt
> down those various sites and then make them call a helper function which
> does
>
> if (unlikely(ns >= NSEC_PER_SEC)) {
> do_div(...)
> }
>
> (Better would be to inline the comparison and to uninline the do_div(),
> if it's a 32-bit arch. Doing all this in a backportable fashion may
> prove tricky)
A suitable fix would be to slap the gcc maintainers with a large trout
to fix this nonsense. At least they should provide a command line option
to prevent this extra intelligent optimization.
tglx
next prev parent reply other threads:[~2007-05-18 23:07 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <200705181941.l4IJfOtf018049@fire-2.osdl.org>
2007-05-18 22:29 ` Andrew Morton
2007-05-18 23:05 ` Adrian Bunk
2007-05-18 23:12 ` Thomas Gleixner [this message]
2007-05-18 23:15 ` Linus Torvalds
2007-05-18 23:39 ` Segher Boessenkool
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