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authorAtsushi Nemoto <anemo@mba.ocn.ne.jp>2007-03-18 01:01:39 +0900
committerRalf Baechle <ralf@linux-mips.org>2007-03-19 20:22:43 +0000
commit72ede9b18967e7a8a62a88f164f003193f6d891f (patch)
tree35131c340dd3e2321d994baafe707c99e2042727 /arch
parent8c3644350f4105a9b55fbfc6bbba567b79cdf72a (diff)
[MIPS] Qemu: Fix Symmetric Uniprocessor support.
Might be useful for SMP debugging. Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp> Signed-off-by: Ralf Baechle <ralf@linux-mips.org> [Rewritten Kconfig bits to deal better fit in the usual pattern of doing things - Ralf] Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/mips/Kconfig15
-rw-r--r--arch/mips/qemu/q-smp.c7
2 files changed, 19 insertions, 3 deletions
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 5f29018a653..656f0ca5278 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -542,6 +542,8 @@ config QEMU
select SYS_SUPPORTS_LITTLE_ENDIAN
select ARCH_SPARSEMEM_ENABLE
select GENERIC_HARDIRQS_NO__DO_IRQ
+ select NR_CPUS_DEFAULT_1
+ select SYS_SUPPORTS_SMP
help
Qemu is a software emulator which among other architectures also
can simulate a MIPS32 4Kc system. This patch adds support for the
@@ -1805,6 +1807,9 @@ config SMP
config SYS_SUPPORTS_SMP
bool
+config NR_CPUS_DEFAULT_1
+ bool
+
config NR_CPUS_DEFAULT_2
bool
@@ -1825,8 +1830,9 @@ config NR_CPUS_DEFAULT_64
config NR_CPUS
int "Maximum number of CPUs (2-64)"
- range 2 64
+ range 1 64 if NR_CPUS_DEFAULT_1
depends on SMP
+ default "1" if NR_CPUS_DEFAULT_1
default "2" if NR_CPUS_DEFAULT_2
default "4" if NR_CPUS_DEFAULT_4
default "8" if NR_CPUS_DEFAULT_8
@@ -1837,10 +1843,13 @@ config NR_CPUS
This allows you to specify the maximum number of CPUs which this
kernel will support. The maximum supported value is 32 for 32-bit
kernel and 64 for 64-bit kernels; the minimum value which makes
- sense is 2.
+ sense is 1 for Qemu (useful only for kernel debugging purposes)
+ and 2 for all others.
This is purely to save memory - each supported CPU adds
- approximately eight kilobytes to the kernel image.
+ approximately eight kilobytes to the kernel image. For best
+ performance should round up your number of processors to the next
+ power of two.
#
# Timer Interrupt Frequency Configuration
diff --git a/arch/mips/qemu/q-smp.c b/arch/mips/qemu/q-smp.c
index 5a12354cd57..786bbfa214d 100644
--- a/arch/mips/qemu/q-smp.c
+++ b/arch/mips/qemu/q-smp.c
@@ -46,3 +46,10 @@ void __init prom_prepare_cpus(unsigned int max_cpus)
void prom_boot_secondary(int cpu, struct task_struct *idle)
{
}
+
+void __init plat_smp_setup(void)
+{
+}
+void __init plat_prepare_cpus(unsigned int max_cpus)
+{
+}