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[PATCH] vmi: paravirt drop udelay op

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Not respecting udelay causes problems with any virtual hardware that is passed
through to real hardware.  This can be noticed by any device that interacts
with the real world in real time - like AP startup, which takes real time.  Or
keyboard LEDs, which should blink in real-time.  Or floppy drives, but only
when passed through to a real floppy controller on OSes which can't
sufficiently buffer the floppy commands to emulate a zero latency floppy.  Or
IDE drives, when connecting to a physical CDROM.

This was mostly a hack to get the kernel to boot faster, but it introduced a
number of misvirtualization bugs, and Alan and Pavel argued pretty strongly
against it.  We were the only client, and now want to clean up this cruft.

Signed-off-by: Zachary Amsden <zach@vmware.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Zachary Amsden
2007-03-05 00:30:38 -08:00
committed by Linus Torvalds
parent 9a1c13e91f
commit eda08b1bef
5 changed files with 1 additions and 22 deletions
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5
arch/i386/kernel/smpboot.c
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@@ -33,11 +33,6 @@
* Dave Jones : Report invalid combinations of Athlon CPUs.
* Rusty Russell : Hacked into shape for new "hotplug" boot process. */
/* SMP boot always wants to use real time delay to allow sufficient time for
* the APs to come online */
#define USE_REAL_TIME_DELAY
#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>