[PATCH v2 1/4] arm64, thunder: Add Kconfig option for Cavium Thunder SoC Family
From: Robert Richter <hidden>
Date: 2014-09-05 10:46:10
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On 05.09.14 10:32:40, Russell King - ARM Linux wrote:
On Fri, Sep 05, 2014 at 09:46:42AM +0200, Robert Richter wrote:quoted
From: Radha Mohan Chintakuntla <redacted> Increase maximum numbers of cpus to 32. This relates to current maximal possible cpu number. Increasing this to 64 cpus will be a separate patch not part of this enablement patches. Signed-off-by: Radha Mohan Chintakuntla <redacted> Signed-off-by: Robert Richter <redacted> --- arch/arm64/Kconfig | 6 ++++++ 1 file changed, 6 insertions(+)diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index fd4e81a4e1ce..77fb82b0f684 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig@@ -134,6 +134,11 @@ source "kernel/Kconfig.freezer" menu "Platform selection" +config ARCH_THUNDER + bool "Cavium Inc. Thunder SoC Family" + help + This enables support for Cavium's Thunder Family of SoCs. + config ARCH_VEXPRESS bool "ARMv8 software model (Versatile Express)" select ARCH_REQUIRE_GPIOLIB@@ -256,6 +261,7 @@ config NR_CPUS range 2 32 depends on SMP # These have to remain sorted largest to smallest + default "32" if ARCH_THUNDER default "8"Why do you need ARCH_THUNDER? If it's just to change this default,
No, we need it just to enable all our drivers on the SoC. We want to enable the SoC by using defconfig + ARCH_THUNDER. As said in my other mail, I put it here to be able to base all other thunder driver patch sets on this initial base patch set. Otherwise this particular patch and also the dtb patch need to be shipped with all other driver patch sets. This might lead to duplicate submissions of the same patch. With doing defconfig + ARCH_THUNDER we also want to enable the max number of cpus that is currently supported. I only enable 32 cpus since booting more cpus is untested. There might be problems at the 32 cpu boundary. Just setting it to 64 does not mean a kernel will actually boot more than 32 cpus. But if it will be ack'ed, I would be fine to set NR_CPUS to 32 or 64 in general and independent from ARCH_THUNDER. For simplicity I better drop setting NR_CPUS in this patch. -Robert
please don't bother - we don't do this kind of thing on x86, so why should it be done here? Just ensure that NR_CPUS is appropriately adjusted. Alternatively, look at how x86 deals with this (with X86_BIGSMP / MAXSMP).