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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> |
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| .. | ||
| include/mach | ||
| board-mop500-pins.c | ||
| board-mop500-regulators.c | ||
| board-mop500-regulators.h | ||
| board-mop500-sdi.c | ||
| board-mop500-stuib.c | ||
| board-mop500-u8500uib.c | ||
| board-mop500-uib.c | ||
| board-mop500.c | ||
| board-mop500.h | ||
| board-u5500-sdi.c | ||
| board-u5500.c | ||
| clock.c | ||
| clock.h | ||
| cpu-db5500.c | ||
| cpu-db8500.c | ||
| cpu.c | ||
| devices-common.c | ||
| devices-common.h | ||
| devices-db5500.h | ||
| devices-db8500.c | ||
| devices-db8500.h | ||
| devices.c | ||
| dma-db5500.c | ||
| headsmp.S | ||
| hotplug.c | ||
| id.c | ||
| Kconfig | ||
| localtimer.c | ||
| Makefile | ||
| Makefile.boot | ||
| mbox-db5500.c | ||
| modem-irq-db5500.c | ||
| pins-db5500.h | ||
| pins-db8500.h | ||
| platsmp.c | ||
| ste-dma40-db5500.h | ||
| ste-dma40-db8500.h | ||
| usb.c | ||