[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>

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 5f29018..656f0ca 100644 (file)
--- 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 5a12354..786bbfa 100644 (file)
--- 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)
+{
+}