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sched: Remove __ARCH_WANT_INTERRUPTS_ON_CTXSW

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Now that the last architecture to use this has stopped doing so (ARM,
thanks Catalin!) we can remove this complexity from the scheduler
core.

Signed-off-by: Peter Zijlstra <[email protected]>
Cc: Oleg Nesterov <[email protected]>
Cc: Catalin Marinas <[email protected]>
Link: http://lkml.kernel.org/n/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Peter Zijlstra 2012-09-12 11:22:00 +02:00 • committed by Ingo Molnar
commit f3e9478674
6 changed files with 1 additions and 69 deletions
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10
Documentation/scheduler/sched-arch.txt
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@ -17,16 +17,6 @@ you must `#define __ARCH_WANT_UNLOCKED_CTXSW` in a header file
Unlocked context switches introduce only a very minor performance
penalty to the core scheduler implementation in the CONFIG_SMP case.
2. Interrupt status
By default, the switch_to arch function is called with interrupts
disabled. Interrupts may be enabled over the call if it is likely to
introduce a significant interrupt latency by adding the line
`#define __ARCH_WANT_INTERRUPTS_ON_CTXSW` in the same place as for
unlocked context switches. This define also implies
`__ARCH_WANT_UNLOCKED_CTXSW`. See arch/arm/include/asm/system.h for an
example.
CPU idle
========
Your cpu_idle routines need to obey the following rules: