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From: Neil Horman <nhorman@tuxdriver.com>
To: "H. Peter Anvin" <hpa@linux.intel.com>
Cc: dev@dpdk.org
Subject: Re: [dpdk-dev] [PATCH v5] eal_common_cpuflags: Fix %rbx corruption, and simplify the code
Date: Wed, 2 Apr 2014 07:16:43 -0400	[thread overview]
Message-ID: <20140402111643.GB6974@neilslaptop.think-freely.org> (raw)
In-Reply-To: <5331EC38.2070901@linux.intel.com>

On Tue, Mar 25, 2014 at 01:51:04PM -0700, H. Peter Anvin wrote:
> On 03/25/2014 12:52 PM, Neil Horman wrote:
> > Neil Horman reported that on x86-64 the upper half of %rbx would get
> > clobbered when the code was compiled PIC or PIE, because the
> > i386-specific code to preserve %ebx was incorrectly compiled.
> > 
> > However, the code is really way more complex than it needs to be.  For
> > one thing, the CPUID instruction only needs %eax (leaf) and %ecx
> > (subleaf) as parameters, and since we are testing for bits, we might
> > as well list the bits explicitly.  Furthermore, we can use an array
> > rather than doing a switch statement inside a structure.
> > 
> > Reported-by: Neil Horman <nhorman@tuxdriver.com>
> > Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
> > Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
> > 
> 
> Looks good to me.
> 
> Reviewed-by: H. Peter Anvin <hpa@linux.intel.com>
> 
> 	-hpa
> 
> 
> 
Bump, did this get lost somewhere?  Its been over a week and I don't see it in
the tree

Regards
Neil

  reply	other threads:[~2014-04-02 11:15 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <1395330830-1310-1-git-send-email-hpa@linux.intel.com>
2014-03-20 16:39 ` [dpdk-dev] [RFC UNTESTED PATCH] " Neil Horman
2014-03-20 17:02   ` Thomas Monjalon
2014-03-20 18:04   ` Neil Horman
2014-03-21 14:49   ` [dpdk-dev] [PATCH v2] " Neil Horman
2014-03-21 15:03     ` H. Peter Anvin
2014-03-21 17:48       ` Neil Horman
2014-03-24 11:18         ` Thomas Monjalon
2014-03-24 17:44   ` [dpdk-dev] [PATCH v3] " Neil Horman
2014-03-24 18:09     ` H. Peter Anvin
2014-03-24 19:52       ` Neil Horman
2014-03-24 20:47         ` H. Peter Anvin
2014-03-25 10:41           ` Neil Horman
2014-03-25 17:03   ` [dpdk-dev] [PATCH v4] " Neil Horman
2014-03-25 17:06     ` Chris Wright
2014-03-25 17:37     ` H. Peter Anvin
2014-03-25 19:52   ` [dpdk-dev] [PATCH v5] " Neil Horman
2014-03-25 20:51     ` H. Peter Anvin
2014-04-02 11:16       ` Neil Horman [this message]
2014-04-02 11:53         ` Thomas Monjalon
2014-04-02 12:42       ` Thomas Monjalon
2014-04-15 14:09 De Lara Guarch, Pablo
2014-04-15 14:56 ` Neil Horman
2014-04-16  8:36   ` De Lara Guarch, Pablo
2014-04-16  8:58 De Lara Guarch, Pablo
2014-04-16  9:06 ` Thomas Monjalon
2014-04-16 10:49 ` Neil Horman
2014-04-16 11:09   ` De Lara Guarch, Pablo
2014-04-16 12:53     ` Neil Horman

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