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sched: Add default defines for PREEMPT_ACTIVE

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The PREEMPT_ACTIVE setting doesn't actually need to be
arch-specific, so set up a sane default for all arches to
(hopefully) migrate to.

> if we look at linux/hardirq.h, it makes this claim:
>  * - bit 28 is the PREEMPT_ACTIVE flag
> if that's true, then why are we letting any arch set this define ?  a
> quick survey shows that half the arches (11) are using 0x10000000 (bit
> 28) while the other half (10) are using 0x4000000 (bit 26).  and then
> there is the ia64 oddity which uses bit 30.  the exact value here
> shouldnt really matter across arches though should it ?

actually alpha, arm and avr32 also use bit 30 (0x40000000),
there are only five (or eight, depending on how you count)
architectures (blackfin, h8300, m68k, s390 and sparc) using bit
26.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Arnd Bergmann 2009-08-06 16:02:50 -07:00 committed by Ingo Molnar
parent bcf08df3b2
commit 8e5b59a2d7
1 changed files with 6 additions and 0 deletions
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6
include/linux/hardirq.h
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@ -64,6 +64,12 @@
#define HARDIRQ_OFFSET (1UL << HARDIRQ_SHIFT)
#define NMI_OFFSET (1UL << NMI_SHIFT)
#ifndef PREEMPT_ACTIVE
#define PREEMPT_ACTIVE_BITS 1
#define PREEMPT_ACTIVE_SHIFT (NMI_SHIFT + NMI_BITS)
#define PREEMPT_ACTIVE (__IRQ_MASK(PREEMPT_ACTIVE_BITS) << PREEMPT_ACTIVE_SHIFT)
#endif
#if PREEMPT_ACTIVE < (1 << (NMI_SHIFT + NMI_BITS))
#error PREEMPT_ACTIVE is too low!
#endif