linux-kernel - [PATCH 0/2] x86-64: allow using RIP-relative addressing for per-CPU data

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Message-Id: <5458A12C0200007800044A97@mail.emea.novell.com>
Date:	Tue, 04 Nov 2014 08:49:32 +0000
From:	"Jan Beulich" <JBeulich@...e.com>
To:	<mingo@...e.hu>, <tglx@...utronix.de>, <hpa@...or.com>
Cc:	<linux-kernel@...r.kernel.org>
Subject: [PATCH 0/2] x86-64: allow using RIP-relative addressing for
 per-CPU data

Observing that per-CPU data (in the SMP case) is reachable by
exploiting 64-bit address wraparound, these two patches
arrange for using the one byte shorter RIP-relative addressing
forms for the majority of per-CPU accesses.

1: handle PC-relative relocations on per-CPU data
2: use RIP-relative addressing for most per-CPU accesses

Signed-off-by: Jan Beulich <jbeulich@...e.com>

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