linux-kernel - [PATCH 1/6] cpumask: make CONFIG_NR

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Message-Id: <200812011846.44406.rusty@rustcorp.com.au>
Date:	Mon, 1 Dec 2008 18:46:44 +1030
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	linux-kernel@...r.kernel.org
Cc:	Mike Travis <travis@....com>
Subject: [PATCH 1/6] 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 remaining NR_CPUS users.

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@...tcorp.com.au>
Signed-off-by: Mike Travis <travis@....com>
---
 include/linux/threads.h |   16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff -r 329e9ec99074 include/linux/threads.h
--- a/include/linux/threads.h	Thu Oct 23 23:46:33 2008 +1100
+++ b/include/linux/threads.h	Thu Oct 23 23:50:50 2008 +1100
@@ -8,16 +8,16 @@
  */

 /*
- * Maximum supported processors that can run under SMP.  This value is
- * set via configure setting.  The maximum is equal to the size of the
- * bitmasks used on that platform, i.e. 32 or 64.  Setting this smaller
- * saves quite a bit of memory.
+ * Maximum supported processors.  Setting this smaller saves quite a
+ * bit of memory.  Use nr_cpu_ids instead of this except for static bitmaps.
  */
-#ifdef CONFIG_SMP
+#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
-#else
-#define NR_CPUS		1
-#endif

 #define MIN_THREADS_LEFT_FOR_ROOT 4

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