All of lore.kernel.org
 help / color / mirror / Atom feed
From: David Miller <davem@davemloft.net>
To: sam@ravnborg.org
Cc: akpm@linux-foundation.org, sparclinux@vger.kernel.org,
	mingo@elte.hu, sfr@canb.auug.org.au,
	linux-kernel@vger.kernel.org, kenchen@google.com,
	paulus@samba.org, tglx@linutronix.de, hpa@zytor.com,
	linux-next@vger.kernel.org
Subject: Re: [PATCH] sparc64: use unsigned long long for u64
Date: Sat, 27 Dec 2008 01:37:12 -0800 (PST)	[thread overview]
Message-ID: <20081227.013712.63335017.davem@davemloft.net> (raw)
In-Reply-To: <20081227092404.GA10375@uranus.ravnborg.org>

From: Sam Ravnborg <sam@ravnborg.org>
Date: Sat, 27 Dec 2008 10:24:04 +0100

> So it looks like my gcc does not promote:
> ((tagval & 0x0fffffff00000000UL) >> 19UL) to unsigned long long int
> but your gcc does?
> 
> My gcc (build with Dan Kegel's crosstool):
> $ /opt/crosstool/gcc-3.4.5-glibc-2.3.6/sparc64-unknown-linux-gnu/bin/sparc64-unknown-linux-gnu-gcc -v
> Reading specs from /opt/crosstool/gcc-3.4.5-glibc-2.3.6/sparc64-unknown-linux-gnu/lib/gcc/sparc64-unknown-linux-gnu/3.4.5/specs
> Configured with: /home/sam/devel/crosstool-0.43/build/sparc64-unknown-linux-gnu/gcc-3.4.5-glibc-2.3.6/gcc-3.4.5/configure --target=sparc64-unknown-linux-gnu --host=i686-host_pc-linux-gnu --prefix=/opt/crosstool/gcc-3.4.5-glibc-2.3.6/sparc64-unknown-linux-gnu --disable-multilib --with-cpu=ultrasparc3 --enable-cxx-flags=-mcpu=ultrasparc3 --with-headers=/opt/crosstool/gcc-3.4.5-glibc-2.3.6/sparc64-unknown-linux-gnu/sparc64-unknown-linux-gnu/include --with-local-prefix=/opt/crosstool/gcc-3.4.5-glibc-2.3.6/sparc64-unknown-linux-gnu/sparc64-unknown-linux-gnu --disable-nls --enable-threads=posix --enable-symvers=gnu --enable-__cxa_atexit --enable-languages=c --enable-shared --enable-c99 --enable-long-long
> Thread model: posix
> gcc version 3.4.5

I'm using a native gcc-4.1.3 here:

gcc (GCC) 4.1.3 20070929 (prerelease) (Ubuntu 4.1.2-16ubuntu2)

When you cross build 32-bit to 64-bit, a small but non-zero
number of warning checks and optimizations are not performed
and I think that is what you're hitting here.

WARNING: multiple messages have this Message-ID (diff)
From: David Miller <davem@davemloft.net>
To: sam@ravnborg.org
Cc: akpm@linux-foundation.org, sparclinux@vger.kernel.org,
	mingo@elte.hu, sfr@canb.auug.org.au,
	linux-kernel@vger.kernel.org, kenchen@google.com,
	paulus@samba.org, tglx@linutronix.de, hpa@zytor.com,
	linux-next@vger.kernel.org
Subject: Re: [PATCH] sparc64: use unsigned long long for u64
Date: Sat, 27 Dec 2008 09:37:12 +0000	[thread overview]
Message-ID: <20081227.013712.63335017.davem@davemloft.net> (raw)
In-Reply-To: <20081227092404.GA10375@uranus.ravnborg.org>

From: Sam Ravnborg <sam@ravnborg.org>
Date: Sat, 27 Dec 2008 10:24:04 +0100

> So it looks like my gcc does not promote:
> ((tagval & 0x0fffffff00000000UL) >> 19UL) to unsigned long long int
> but your gcc does?
> 
> My gcc (build with Dan Kegel's crosstool):
> $ /opt/crosstool/gcc-3.4.5-glibc-2.3.6/sparc64-unknown-linux-gnu/bin/sparc64-unknown-linux-gnu-gcc -v
> Reading specs from /opt/crosstool/gcc-3.4.5-glibc-2.3.6/sparc64-unknown-linux-gnu/lib/gcc/sparc64-unknown-linux-gnu/3.4.5/specs
> Configured with: /home/sam/devel/crosstool-0.43/build/sparc64-unknown-linux-gnu/gcc-3.4.5-glibc-2.3.6/gcc-3.4.5/configure --target=sparc64-unknown-linux-gnu --host=i686-host_pc-linux-gnu --prefix=/opt/crosstool/gcc-3.4.5-glibc-2.3.6/sparc64-unknown-linux-gnu --disable-multilib --with-cpu=ultrasparc3 --enable-cxx-flags=-mcpu=ultrasparc3 --with-headers=/opt/crosstool/gcc-3.4.5-glibc-2.3.6/sparc64-unknown-linux-gnu/sparc64-unknown-linux-gnu/include --with-local-prefix=/opt/crosstool/gcc-3.4.5-glibc-2.3.6/sparc64-unknown-linux-gnu/sparc64-unknown-linux-gnu --disable-nls --enable-threads=posix --enable-symvers=gnu --enable-__cxa_atexit --enable-languages=c --enable-shared --enable-c99 --enable-long-long
> Thread model: posix
> gcc version 3.4.5

I'm using a native gcc-4.1.3 here:

gcc (GCC) 4.1.3 20070929 (prerelease) (Ubuntu 4.1.2-16ubuntu2)

When you cross build 32-bit to 64-bit, a small but non-zero
number of warning checks and optimizations are not performed
and I think that is what you're hitting here.

  reply	other threads:[~2008-12-27  9:37 UTC|newest]

Thread overview: 44+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-12-22  4:22 linux-next: sched tree build warning Stephen Rothwell
2008-12-22  6:47 ` Ingo Molnar
2008-12-22  6:49 ` Ken Chen
2008-12-22  7:04   ` Ingo Molnar
2008-12-22  7:19     ` Stephen Rothwell
2008-12-22  8:03       ` [patch] powerpc: change u64/s64 to a long long integer type Ingo Molnar
2008-12-22 22:43         ` Andrew Morton
2008-12-22 23:00           ` Sam Ravnborg
2008-12-22 23:03             ` H. Peter Anvin
2008-12-22 23:13               ` Sam Ravnborg
2008-12-22 23:13             ` Andrew Morton
2008-12-23 13:17               ` [PATCH] sparc64: use unsigned long long for u64 Sam Ravnborg
2008-12-23 13:17                 ` Sam Ravnborg
2008-12-23 13:17                 ` Sam Ravnborg
2008-12-23 14:42                 ` [PATCH] sparc64: fix unsigned long long warnings in drivers Sam Ravnborg
2008-12-23 14:42                   ` Sam Ravnborg
2008-12-23 17:05                 ` [PATCH] sparc64: use unsigned long long for u64 Ken Chen
2008-12-23 17:05                   ` Ken Chen
2008-12-23 17:26                   ` Sam Ravnborg
2008-12-23 17:26                     ` Sam Ravnborg
2008-12-23 17:29                     ` Ken Chen
2008-12-23 17:29                       ` Ken Chen
2008-12-23 17:34                       ` Sam Ravnborg
2008-12-23 17:34                         ` Sam Ravnborg
2008-12-27  8:54                 ` David Miller
2008-12-27  8:54                   ` David Miller
2008-12-27  8:54                   ` David Miller
2008-12-27  9:24                   ` Sam Ravnborg
2008-12-27  9:24                     ` Sam Ravnborg
2008-12-27  9:37                     ` David Miller [this message]
2008-12-27  9:37                       ` David Miller
2008-12-27  9:49                       ` Sam Ravnborg
2008-12-27  9:49                         ` Sam Ravnborg
2008-12-28  4:25                         ` David Miller
2008-12-28  4:25                           ` David Miller
2008-12-28 12:32                           ` Sam Ravnborg
2008-12-28 12:32                             ` Sam Ravnborg
2008-12-31  4:40         ` [patch] powerpc: change u64/s64 to a long long integer type Stephen Rothwell
2008-12-31  7:52           ` Ingo Molnar
2008-12-22  8:14     ` linux-next: sched tree build warning Paul Mackerras
2008-12-22  8:18       ` Ingo Molnar
2008-12-22  9:44         ` Paul Mackerras
2008-12-22 10:53           ` Ingo Molnar
2008-12-22 12:03             ` Paul Mackerras

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=20081227.013712.63335017.davem@davemloft.net \
    --to=davem@davemloft.net \
    --cc=akpm@linux-foundation.org \
    --cc=hpa@zytor.com \
    --cc=kenchen@google.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-next@vger.kernel.org \
    --cc=mingo@elte.hu \
    --cc=paulus@samba.org \
    --cc=sam@ravnborg.org \
    --cc=sfr@canb.auug.org.au \
    --cc=sparclinux@vger.kernel.org \
    --cc=tglx@linutronix.de \
    /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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.