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| author | Atsushi Nemoto <anemo@mba.ocn.ne.jp> | 2007-03-17 17:01:39 +0100 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2007-03-19 21:22:43 +0100 |
| commit | 72ede9b18967e7a8a62a88f164f003193f6d891f (patch) | |
| tree | 35131c340dd3e2321d994baafe707c99e2042727 | |
| parent | [MIPS] VI: TRACE_IRQS_OFF clobbers $v0, so save & restore around call. (diff) | |
| download | linux-72ede9b18967e7a8a62a88f164f003193f6d891f.tar.xz linux-72ede9b18967e7a8a62a88f164f003193f6d891f.zip | |
[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>
| -rw-r--r-- | arch/mips/Kconfig | 15 | ||||
| -rw-r--r-- | arch/mips/qemu/q-smp.c | 7 |
2 files changed, 19 insertions, 3 deletions
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index 5f29018a6533..656f0ca52782 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 5a12354cd576..786bbfa214d1 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) +{ +} |