From: Denys Vlasenko <dvlasenk@redhat.com>
Date: Thu, 12 Feb 2015 19:06:57 +0000 (+0100)
Subject: x86/asm/decoder: Explain CALLW discrepancy between Intel and AMD
X-Git-Tag: omap-for-v4.2/o2_dc~185^2~133
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=cbb53b9623a70f012e1fdfb6fc0af6878df4762b;p=pandora-kernel.git

x86/asm/decoder: Explain CALLW discrepancy between Intel and AMD

In 64-bit mode, AMD and Intel CPUs treat 0x66 prefix before
branch insns differently. For near branches, it affects decode
too since immediate offset's width is different.

See these empirical tests:

  http://marc.info/?l=linux-kernel&m=139714939728946&w=2

Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Link: http://lkml.kernel.org/r/1423768017-31766-1-git-send-email-dvlasenk@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---

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