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linux/arch/arm
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Stephen Boyd 7fa22bd546 ARM: 6993/1: platsmp: Allow secondary cpu hotplug with maxcpus=1 
If an ARM system has multiple cpus in the same socket and the
kernel is booted with maxcpus=1, secondary cpus are possible but
not present due to how platform_smp_prepare_cpus() is called.
Since most typical ARM processors don't actually support physical
hotplug, initialize the present map to be equal to the possible
map in generic ARM SMP code. Also, always call
platform_smp_prepare_cpus() as long as max_cpus is non-zero (0
means no SMP) to allow platform code to do any SMP setup.

After applying this patch it's possible to boot an ARM system
with maxcpus=1 on the command line and then hotplug in secondary
cpus via sysfs. This is more in line with how x86 does things.

Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: Kukjin Kim <kgene.kim@samsung.com>
Cc: David Brown <davidb@codeaurora.org>
Cc: Tony Lindgren <tony@atomide.com>
Cc: Srinidhi Kasagar <srinidhi.kasagar@stericsson.com>
Cc: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
 		2011-07-07 14:45:07 +01:00
..
boot ARM: 6886/1: mmc, Add zboot from eSD support for SuperH Mobile ARM 2011-06-29 10:00:52 +01:00
common Merge branch 'for-rmk' of git://git.kernel.org/pub/scm/linux/kernel/git/kgene/linux-samsung into devel-stable 2011-05-25 21:47:48 +01:00
configs Merge branch 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm 2011-05-27 19:51:32 -07:00
include/asm ARM: 6988/1: multi-cpu: remove arguments from CPU proc macros 2011-07-06 20:49:45 +01:00
kernel ARM: 6993/1: platsmp: Allow secondary cpu hotplug with maxcpus=1 2011-07-07 14:45:07 +01:00
lib ARM: 6945/1: Add unwinding support for division functions 2011-05-27 22:56:53 +01:00
mach-at91 at91: drop at572d940hf support 2011-05-25 23:04:35 +08:00
mach-bcmring ARM: bcmring: convert to use sp804 clockevents 2011-05-23 18:04:54 +01:00
mach-clps711x arm: Fold irq_set_chip/irq_set_handler 2011-03-29 14:47:58 +02:00
mach-cns3xxx
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mach-davinci Merge branch 'davinci-next' of git://gitorious.org/linux-davinci/linux-davinci into devel-stable 2011-05-25 00:11:25 +01:00
mach-dove ARM: dove: Consolidate mpp code with platform mpp. 2011-05-16 15:49:31 -04:00
mach-ebsa110 arm: Fold irq_set_chip/irq_set_handler 2011-03-29 14:47:58 +02:00
mach-ep93xx ARM: 6852/1: EP93xx: Remove ep93xx_gpio_dbg_show function 2011-05-11 12:37:18 +01:00
mach-exynos4 ARM: 6993/1: platsmp: Allow secondary cpu hotplug with maxcpus=1 2011-07-07 14:45:07 +01:00
mach-footbridge clocksource: convert footbridge to generic i8253 clocksource 2011-05-14 10:29:48 +01:00
mach-gemini Merge git://git.infradead.org/mtd-2.6 2011-05-27 20:06:53 -07:00
mach-h720x ARM: Replace platform definition of ISA_DMA_THRESHOLD/MAX_DMA_ADDRESS 2011-05-12 08:36:49 +01:00
mach-imx ARM: imx: move mx3 support to mach-imx 2011-05-19 13:11:38 +02:00
mach-integrator Merge branches 'consolidate-clksrc', 'consolidate-flash', 'consolidate-generic', 'consolidate-smp', 'consolidate-stmp' and 'consolidate-zones' into consolidate 2011-05-23 18:05:10 +01:00
mach-iop13xx Fix common misspellings 2011-03-31 11:26:23 -03:00
mach-iop32x ARM: zImage: remove the static qualifier from global data variables 2011-05-07 00:08:02 -04:00
mach-iop33x ARM: zImage: remove the static qualifier from global data variables 2011-05-07 00:08:02 -04:00
mach-ixp4xx Merge git://git.infradead.org/mtd-2.6 2011-05-27 20:06:53 -07:00
mach-ixp23xx arm: Fold irq_set_chip/irq_set_handler 2011-03-29 14:47:58 +02:00
mach-ixp2000 arm: Fold irq_set_chip/irq_set_handler 2011-03-29 14:47:58 +02:00
mach-kirkwood ARM: orion: Refactor the MPP code common in the orion platform 2011-05-16 15:25:54 -04:00
mach-ks8695 arm: Fold irq_set_chip/irq_set_handler 2011-03-29 14:47:58 +02:00
mach-l7200/include/mach
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mach-loki ARM: orion: Consolidate ethernet platform data 2011-05-16 15:06:01 -04:00
mach-lpc32xx clocksource: convert ARM 32-bit up counting clocksources 2011-05-23 18:04:51 +01:00
mach-mmp Merge branch 'zImage_fixes' of git://git.linaro.org/people/nico/linux into devel-stable 2011-05-07 08:34:02 +01:00
mach-msm ARM: 6993/1: platsmp: Allow secondary cpu hotplug with maxcpus=1 2011-07-07 14:45:07 +01:00
mach-mv78xx0 ARM: orion: Refactor the MPP code common in the orion platform 2011-05-16 15:25:54 -04:00
mach-mx5 ARM: mxc: don't allow to compile together i.MX51 and i.MX53 2011-05-19 13:11:30 +02:00
mach-mxs Merge branch 'devel-stable' into for-linus 2011-05-23 19:28:04 +01:00
mach-netx ARM: 6827/1: mach-netx: delete hardcoded periphid 2011-05-26 10:33:34 +01:00
mach-nomadik gpio: move Nomadik GPIO driver to drivers/gpio 2011-05-26 17:30:03 -06:00
mach-nuc93x ARM: zImage: remove the static qualifier from global data variables 2011-05-07 00:08:02 -04:00
mach-omap1 Merge branches 'consolidate-clksrc', 'consolidate-flash', 'consolidate-generic', 'consolidate-smp', 'consolidate-stmp' and 'consolidate-zones' into consolidate 2011-05-23 18:05:10 +01:00
mach-omap2 ARM: 6993/1: platsmp: Allow secondary cpu hotplug with maxcpus=1 2011-07-07 14:45:07 +01:00
mach-orion5x ARM: orion5x: Refactor mpp code to use common orion platform mpp. 2011-05-16 15:42:59 -04:00
mach-pnx4008 arm: Cleanup the irq namespace 2011-03-29 14:47:57 +02:00
mach-pxa Merge git://git.infradead.org/mtd-2.6 2011-05-27 20:06:53 -07:00
mach-realview ARM: 6993/1: platsmp: Allow secondary cpu hotplug with maxcpus=1 2011-07-07 14:45:07 +01:00
mach-rpc ARM: zImage: remove the static qualifier from global data variables 2011-05-07 00:08:02 -04:00
mach-s3c24a0/include/mach
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mach-s3c64xx Merge branch 'for-rmk' of git://git.kernel.org/pub/scm/linux/kernel/git/kgene/linux-samsung into devel-stable 2011-05-25 21:47:48 +01:00
mach-s3c2400
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mach-s3c2410 Merge git://git.infradead.org/mtd-2.6 2011-05-27 20:06:53 -07:00
mach-s3c2412 ARM / Samsung: Use struct syscore_ops for "core" power management 2011-04-24 19:16:10 +02:00
mach-s3c2416 Merge branch 'usb-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb-2.6 2011-05-23 12:33:02 -07:00
mach-s3c2440 ARM / Samsung: Use struct syscore_ops for "core" power management 2011-04-24 19:16:10 +02:00
mach-s3c2443 arm: Fold irq_set_chip/irq_set_handler 2011-03-29 14:47:58 +02:00
mach-s5p64x0 ARM: zImage: remove the static qualifier from global data variables 2011-05-07 00:08:02 -04:00
mach-s5pc100 gpio: Move the s5pc100 GPIO to drivers/gpio 2011-05-26 17:33:41 -06:00
mach-s5pv210 gpio: Move the s5pv210 GPIO to drivers/gpio 2011-05-26 17:33:37 -06:00
mach-sa1100 Merge branches 'consolidate-clksrc', 'consolidate-flash', 'consolidate-generic', 'consolidate-smp', 'consolidate-stmp' and 'consolidate-zones' into consolidate 2011-05-23 18:05:10 +01:00
mach-shark ARM: use ARM_DMA_ZONE_SIZE to adjust the zone sizes 2011-05-12 08:36:53 +01:00
mach-shmobile ARM: 6993/1: platsmp: Allow secondary cpu hotplug with maxcpus=1 2011-07-07 14:45:07 +01:00
mach-spear3xx ARM: 6931/1: SPEAr3xx: Rework KConfig to allow all boards to be compiled in 2011-05-20 22:34:25 +01:00
mach-spear6xx ARM: 6934/1: SPEAr6xx: Rework Kconfig for single image solution 2011-05-20 22:34:25 +01:00
mach-tcc8k clocksource: convert ARM 32-bit up counting clocksources 2011-05-23 18:04:51 +01:00
mach-tegra ARM: 6993/1: platsmp: Allow secondary cpu hotplug with maxcpus=1 2011-07-07 14:45:07 +01:00
mach-u300 gpio: move U300 GPIO driver to drivers/gpio 2011-05-26 17:29:33 -06:00
mach-ux500 ARM: 6993/1: platsmp: Allow secondary cpu hotplug with maxcpus=1 2011-07-07 14:45:07 +01:00
mach-versatile Merge branches 'consolidate-clksrc', 'consolidate-flash', 'consolidate-generic', 'consolidate-smp', 'consolidate-stmp' and 'consolidate-zones' into consolidate 2011-05-23 18:05:10 +01:00
mach-vexpress ARM: 6993/1: platsmp: Allow secondary cpu hotplug with maxcpus=1 2011-07-07 14:45:07 +01:00
mach-vt8500 arm: Fold irq_set_chip/irq_set_handler 2011-03-29 14:47:58 +02:00
mach-w90x900 Merge branch 'devel-stable' into for-linus 2011-05-23 19:28:04 +01:00
mm Merge branches 'devel', 'devel-stable' and 'fixes' into for-linus 2011-05-27 22:59:57 +01:00
nwfpe
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oprofile
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plat-iop ARM: Remove duplicate linux/sched.h include from arch/arm/plat-iop/time.c 2011-04-10 17:01:02 +02:00
plat-mxc Merge branch 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm 2011-05-23 15:15:27 -07:00
plat-nomadik gpio/nomadik: add function to read GPIO pull down status 2011-05-26 17:30:18 -06:00
plat-omap Merge branch 'for_2.6.40/gpio-move' of git://git.kernel.org/pub/scm/linux/kernel/git/khilman/linux-omap-pm into gpio/next 2011-05-27 23:52:58 -06:00
plat-orion Merge branch 'devel-stable' into for-linus 2011-05-23 19:28:04 +01:00
plat-pxa ARM / PXA: Use struct syscore_ops for "core" power management 2011-04-24 19:16:09 +02:00
plat-s3c24xx Merge branch 'usb-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb-2.6 2011-05-23 12:33:02 -07:00
plat-s5p Merge branch 'for-rmk' of git://git.kernel.org/pub/scm/linux/kernel/git/kgene/linux-samsung into devel-stable 2011-05-25 21:47:48 +01:00
plat-samsung Merge branch 'gpio/next' of git://git.secretlab.ca/git/linux-2.6 2011-05-28 10:56:34 -07:00
plat-spear Merge branches 'consolidate', 'ep93xx', 'fixes', 'misc', 'mmci', 'remove' and 'spear' into for-linus 2011-05-23 19:27:40 +01:00
plat-tcc
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plat-versatile ARM: consolidate SMP cross call implementation 2011-05-23 16:53:17 +01:00
tools ARM: Update mach-types 2011-05-14 21:36:55 +01:00
vfp ARM: Use struct syscore_ops instead of sysdevs for PM in common code 2011-04-24 19:16:08 +02:00
Kconfig ARM: 6960/1: allow enabling SCU code on UP 2011-07-06 20:55:15 +01:00
Kconfig-nommu Fix common misspellings 2011-03-31 11:26:23 -03:00
Kconfig.debug lib: consolidate DEBUG_STACK_USAGE option 2011-05-25 08:39:54 -07:00
Makefile Merge branch 'for-rmk' of git://git.kernel.org/pub/scm/linux/kernel/git/kgene/linux-samsung into devel-stable 2011-05-25 21:47:48 +01:00