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authorStephen Boyd <sboyd@codeaurora.org>2011-07-07 01:56:51 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2011-07-07 14:45:07 +0100
commit7fa22bd5460bb2021729fa5a1012c60b9b3a56e2 (patch)
treef17dd732f1c915b52a3d5de968ed0e26596a4feb /arch/arm/mach-vexpress
parent10cdc7e5129ac26aefece4c7a7d5b1a0285237c2 (diff)
downloadblackbird-op-linux-7fa22bd5460bb2021729fa5a1012c60b9b3a56e2.tar.gz
blackbird-op-linux-7fa22bd5460bb2021729fa5a1012c60b9b3a56e2.zip
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>
Diffstat (limited to 'arch/arm/mach-vexpress')
-rw-r--r--arch/arm/mach-vexpress/ct-ca9x4.c4
1 files changed, 0 insertions, 4 deletions
diff --git a/arch/arm/mach-vexpress/ct-ca9x4.c b/arch/arm/mach-vexpress/ct-ca9x4.c
index 765a71ff7f3b..bfd32f52c2db 100644
--- a/arch/arm/mach-vexpress/ct-ca9x4.c
+++ b/arch/arm/mach-vexpress/ct-ca9x4.c
@@ -229,10 +229,6 @@ static void ct_ca9x4_init_cpu_map(void)
static void ct_ca9x4_smp_enable(unsigned int max_cpus)
{
- int i;
- for (i = 0; i < max_cpus; i++)
- set_cpu_present(i, true);
-
scu_enable(MMIO_P2V(A9_MPCORE_SCU));
}
#endif
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