[MIPS] Fix AP/SP to work in the reality of modern kernels.

[linux-2.6-omap-h63xx.git] / arch / mips / Kconfig

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 5f29018a653366169f96bf87161ab8a80fcfffae..c78b14380b3e1fb4bbfdf1b794f065620846588c 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
@@ -1604,7 +1606,7 @@ config MIPS_MT_FPAFF
 
 config MIPS_MT_SMTC_INSTANT_REPLAY
        bool "Low-latency Dispatch of Deferred SMTC IPIs"
-       depends on MIPS_MT_SMTC
+       depends on MIPS_MT_SMTC && !PREEMPT
        default y
        help
          SMTC pseudo-interrupts between TCs are deferred and queued
@@ -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