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linux-next/include/linux/threads.h
Rusty Russell 278d1ed65e cpumask: make CONFIG_NR_CPUS always valid.
Impact: cleanup

Currently we have NR_CPUS, which is 1 on UP, and CONFIG_NR_CPUS on
SMP.  If we make CONFIG_NR_CPUS always valid (and always 1 on !SMP),
we can skip the middleman.

This also allows us to find and check all the unaudited NR_CPUS usage
as we prepare for v. large NR_CPUS.

To avoid breaking every arch, we cheat and do this for the moment
in the header if the arch doesn't.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Mike Travis <travis@sgi.com>
2008-12-30 09:05:12 +10:30

37 lines
938 B
C

#ifndef _LINUX_THREADS_H
#define _LINUX_THREADS_H
/*
* The default limit for the nr of threads is now in
* /proc/sys/kernel/threads-max.
*/
/*
* Maximum supported processors. Setting this smaller saves quite a
* bit of memory. Use nr_cpu_ids instead of this except for static bitmaps.
*/
#ifndef CONFIG_NR_CPUS
/* FIXME: This should be fixed in the arch's Kconfig */
#define CONFIG_NR_CPUS 1
#endif
/* Places which use this should consider cpumask_var_t. */
#define NR_CPUS CONFIG_NR_CPUS
#define MIN_THREADS_LEFT_FOR_ROOT 4
/*
* This controls the default maximum pid allocated to a process
*/
#define PID_MAX_DEFAULT (CONFIG_BASE_SMALL ? 0x1000 : 0x8000)
/*
* A maximum of 4 million PIDs should be enough for a while.
* [NOTE: PID/TIDs are limited to 2^29 ~= 500+ million, see futex.h.]
*/
#define PID_MAX_LIMIT (CONFIG_BASE_SMALL ? PAGE_SIZE * 8 : \
(sizeof(long) > 4 ? 4 * 1024 * 1024 : PID_MAX_DEFAULT))
#endif