netdev - Re: net-next panic in ovs call to arch_fast

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Message-Id: <20141113.214549.1520205472319716774.davem@davemloft.net>
Date:	Thu, 13 Nov 2014 21:45:49 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	jay.vosburgh@...onical.com
Cc:	netdev@...r.kernel.org, discuss@...nvswitch.org,
	pshelar@...ira.com, ogerlitz@...lanox.com
Subject: Re: net-next panic in ovs call to arch_fast_hash2 since e5a2c899 

From: Jay Vosburgh <jay.vosburgh@...onical.com>
Date: Thu, 13 Nov 2014 18:15:32 -0800

> 	The "have feature" function, __intel_crc4_2_hash2, does not
> clobber %r8, and so the call does not panic on a system with
> X86_FEATURE_XMM4_2, although I'm not sure if that's a deliberate
> compiler action or just happenstance because __intel_crc4_2_hash2 uses
> fewer registers than __jhash2.

Perhaps alternative calls can only be used with assembler routines
that use specific calling conventions, and they therefore generally
don't work with C functions?
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