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authorMike Travis <travis@sgi.com>2008-07-24 18:21:29 -0700
committerIngo Molnar <mingo@elte.hu>2008-07-26 16:40:32 +0200
commitb8d317d10cca76cabe6b03ebfeb23cc99118b731 (patch)
treea997d21960099095822ffbfe8be4d3f6176f33a9 /kernel/cpu.c
parent024e8ac04453b3525448c31ef39848cf675ba6db (diff)
downloadlwn-b8d317d10cca76cabe6b03ebfeb23cc99118b731.tar.gz
lwn-b8d317d10cca76cabe6b03ebfeb23cc99118b731.zip
cpumask: make cpumask_of_cpu_map generic
If an arch doesn't define cpumask_of_cpu_map, create a generic statically-initialized one for them. This allows removal of the buggy cpumask_of_cpu() macro (&cpumask_of_cpu() gives address of out-of-scope var). An arch with NR_CPUS of 4096 probably wants to allocate this itself based on the actual number of CPUs, since otherwise they're using 2MB of rodata (1024 cpus means 128k). That's what CONFIG_HAVE_CPUMASK_OF_CPU_MAP is for (only x86/64 does so at the moment). In future as we support more CPUs, we'll need to resort to a get_cpu_map()/put_cpu_map() allocation scheme. Signed-off-by: Mike Travis <travis@sgi.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Jack Steiner <steiner@sgi.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/cpu.c')
-rw-r--r--kernel/cpu.c109
1 files changed, 109 insertions, 0 deletions
diff --git a/kernel/cpu.c b/kernel/cpu.c
index 10ba5f1004a5..fe31ff3d3809 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -461,3 +461,112 @@ out:
#endif /* CONFIG_PM_SLEEP_SMP */
#endif /* CONFIG_SMP */
+
+#ifndef CONFIG_HAVE_CPUMASK_OF_CPU_MAP
+/* 64 bits of zeros, for initializers. */
+#if BITS_PER_LONG == 32
+#define Z64 0, 0
+#else
+#define Z64 0
+#endif
+
+/* Initializer macros. */
+#define CMI0(n) { .bits = { 1UL << (n) } }
+#define CMI(n, ...) { .bits = { __VA_ARGS__, 1UL << ((n) % BITS_PER_LONG) } }
+
+#define CMI8(n, ...) \
+ CMI((n), __VA_ARGS__), CMI((n)+1, __VA_ARGS__), \
+ CMI((n)+2, __VA_ARGS__), CMI((n)+3, __VA_ARGS__), \
+ CMI((n)+4, __VA_ARGS__), CMI((n)+5, __VA_ARGS__), \
+ CMI((n)+6, __VA_ARGS__), CMI((n)+7, __VA_ARGS__)
+
+#if BITS_PER_LONG == 32
+#define CMI64(n, ...) \
+ CMI8((n), __VA_ARGS__), CMI8((n)+8, __VA_ARGS__), \
+ CMI8((n)+16, __VA_ARGS__), CMI8((n)+24, __VA_ARGS__), \
+ CMI8((n)+32, 0, __VA_ARGS__), CMI8((n)+40, 0, __VA_ARGS__), \
+ CMI8((n)+48, 0, __VA_ARGS__), CMI8((n)+56, 0, __VA_ARGS__)
+#else
+#define CMI64(n, ...) \
+ CMI8((n), __VA_ARGS__), CMI8((n)+8, __VA_ARGS__), \
+ CMI8((n)+16, __VA_ARGS__), CMI8((n)+24, __VA_ARGS__), \
+ CMI8((n)+32, __VA_ARGS__), CMI8((n)+40, __VA_ARGS__), \
+ CMI8((n)+48, __VA_ARGS__), CMI8((n)+56, __VA_ARGS__)
+#endif
+
+#define CMI256(n, ...) \
+ CMI64((n), __VA_ARGS__), CMI64((n)+64, Z64, __VA_ARGS__), \
+ CMI64((n)+128, Z64, Z64, __VA_ARGS__), \
+ CMI64((n)+192, Z64, Z64, Z64, __VA_ARGS__)
+#define Z256 Z64, Z64, Z64, Z64
+
+#define CMI1024(n, ...) \
+ CMI256((n), __VA_ARGS__), \
+ CMI256((n)+256, Z256, __VA_ARGS__), \
+ CMI256((n)+512, Z256, Z256, __VA_ARGS__), \
+ CMI256((n)+768, Z256, Z256, Z256, __VA_ARGS__)
+#define Z1024 Z256, Z256, Z256, Z256
+
+/* We want this statically initialized, just to be safe. We try not
+ * to waste too much space, either. */
+static const cpumask_t cpumask_map[] = {
+ CMI0(0), CMI0(1), CMI0(2), CMI0(3),
+#if NR_CPUS > 4
+ CMI0(4), CMI0(5), CMI0(6), CMI0(7),
+#endif
+#if NR_CPUS > 8
+ CMI0(8), CMI0(9), CMI0(10), CMI0(11),
+ CMI0(12), CMI0(13), CMI0(14), CMI0(15),
+#endif
+#if NR_CPUS > 16
+ CMI0(16), CMI0(17), CMI0(18), CMI0(19),
+ CMI0(20), CMI0(21), CMI0(22), CMI0(23),
+ CMI0(24), CMI0(25), CMI0(26), CMI0(27),
+ CMI0(28), CMI0(29), CMI0(30), CMI0(31),
+#endif
+#if NR_CPUS > 32
+#if BITS_PER_LONG == 32
+ CMI(32, 0), CMI(33, 0), CMI(34, 0), CMI(35, 0),
+ CMI(36, 0), CMI(37, 0), CMI(38, 0), CMI(39, 0),
+ CMI(40, 0), CMI(41, 0), CMI(42, 0), CMI(43, 0),
+ CMI(44, 0), CMI(45, 0), CMI(46, 0), CMI(47, 0),
+ CMI(48, 0), CMI(49, 0), CMI(50, 0), CMI(51, 0),
+ CMI(52, 0), CMI(53, 0), CMI(54, 0), CMI(55, 0),
+ CMI(56, 0), CMI(57, 0), CMI(58, 0), CMI(59, 0),
+ CMI(60, 0), CMI(61, 0), CMI(62, 0), CMI(63, 0),
+#else
+ CMI0(32), CMI0(33), CMI0(34), CMI0(35),
+ CMI0(36), CMI0(37), CMI0(38), CMI0(39),
+ CMI0(40), CMI0(41), CMI0(42), CMI0(43),
+ CMI0(44), CMI0(45), CMI0(46), CMI0(47),
+ CMI0(48), CMI0(49), CMI0(50), CMI0(51),
+ CMI0(52), CMI0(53), CMI0(54), CMI0(55),
+ CMI0(56), CMI0(57), CMI0(58), CMI0(59),
+ CMI0(60), CMI0(61), CMI0(62), CMI0(63),
+#endif /* BITS_PER_LONG == 64 */
+#endif
+#if NR_CPUS > 64
+ CMI64(64, Z64),
+#endif
+#if NR_CPUS > 128
+ CMI64(128, Z64, Z64), CMI64(192, Z64, Z64, Z64),
+#endif
+#if NR_CPUS > 256
+ CMI256(256, Z256),
+#endif
+#if NR_CPUS > 512
+ CMI256(512, Z256, Z256), CMI256(768, Z256, Z256, Z256),
+#endif
+#if NR_CPUS > 1024
+ CMI1024(1024, Z1024),
+#endif
+#if NR_CPUS > 2048
+ CMI1024(2048, Z1024, Z1024), CMI1024(3072, Z1024, Z1024, Z1024),
+#endif
+#if NR_CPUS > 4096
+#error NR_CPUS too big. Fix initializers or set CONFIG_HAVE_CPUMASK_OF_CPU_MAP
+#endif
+};
+
+const cpumask_t *cpumask_of_cpu_map = cpumask_map;
+#endif /* !CONFIG_HAVE_CPUMASK_OF_CPU_MAP */