From: Chris Wright <chrisw@redhat.com>
To: Neil Horman <nhorman@tuxdriver.com>
Cc: dev@dpdk.org, "H. Peter Anvin" <hpa@linux.intel.com>
Subject: Re: [dpdk-dev] [PATCH v4] eal_common_cpuflags: Fix %rbx corruption, and simplify the code
Date: Tue, 25 Mar 2014 10:06:36 -0700 [thread overview]
Message-ID: <20140325170636.GX12042@x220.localdomain> (raw)
In-Reply-To: <1395767000-28709-1-git-send-email-nhorman@tuxdriver.com>
* Neil Horman (nhorman@tuxdriver.com) wrote:
(given the format, I'd expect a From hpa here)
> 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>
And an S-o-B by you
(sorry for the otherwise content free nitpick)
next prev parent reply other threads:[~2014-03-25 18:12 UTC|newest]
Thread overview: 20+ 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 [this message]
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
2014-04-02 11:53 ` Thomas Monjalon
2014-04-02 12:42 ` Thomas Monjalon
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