kernel.git/arch/arm/kernel/smp.c, branch linux-2.6.37.y

ARM: smp: avoid incrementing mm_users on CPU startup

2010-12-18T13:57:00Z

We should not be incrementing mm_users when we startup a secondary CPU - doing so results in mm_users incrementing by one each time we hotplug a CPU, which will eventually wrap, and will cause problems. Other architectures such as x86 do not increment mm_users, but only mm_count, so we follow that pattern. Signed-off-by: Russell King

Merge branch 'hotplug' into devel

2010-10-18T21:34:47Z

Conflicts: arch/arm/kernel/head-common.S

ARM: hotplug cpu: setup 1:1 map for entire kernel image for secondary CPUs

2010-10-08T09:07:32Z

Make the entire kernel image available for secondary CPUs rather than just the first MB of memory. This allows the startup code to appear in the cpuinit sections. Signed-off-by: Russell King

ARM: 6402/1: Don't send IPI in smp_send_stop if there's only one CPU

2010-10-04T19:23:36Z

No need to send IPI if there's one CPU, especially when booting systems with CONFIG_SMP_ON_UP that may not even support IPI. Signed-off-by: Tony Lindgren Signed-off-by: Russell King

ARM: call machine_shutdown() from machine_halt(), etc

2010-07-27T09:48:43Z

x86 calls machine_shutdown() from the various machine_*() calls which take the machine down ready for halting, restarting, etc, and uses this to bring the system safely to a point where those actions can be performed. Such actions are stopping the secondary CPUs. So, change the ARM implementation of these to reflect what x86 does. This solves kexec problems on ARM SMP platforms, where the secondary CPUs were left running across the kexec call. Signed-off-by: Russell King

ARM: SMP: Always enable clock event broadcast support

2010-07-27T09:48:42Z

The TWD local timers are unable to wake up the CPU when it is placed into a low power mode, eg. C3. Therefore, we need to adapt things such that the TWD code can cope with this. We do this by always providing a broadcast tick function, and marking the fact that the TWD local timer will stop in low power modes. This means that when the CPU is placed into a low power mode, the core timer code marks this fact, and allows an IPI to be given to the core. Tested-by: Santosh Shilimkar Signed-off-by: Russell King Cc: Catalin Marinas Cc: Thomas Gleixner

Merge branch 'devel-stable' into devel

2010-05-17T16:24:04Z

Conflicts: arch/arm/Kconfig arch/arm/include/asm/system.h arch/arm/mm/Kconfig

ARM: rename mach_cpu_disable() to platform_cpu_disable()

2010-05-15T14:03:51Z

Consistently name all SMP platform related functions. Signed-off-by: Russell King

ARM: 6066/1: Fix "BUG: scheduling while atomic: swapper/0/0x00000002

2010-05-01T10:32:57Z

This patch fixes the preempt leak in the cpuidle path invoked from cpu-hotplug. The fix is suggested by Russell King and is based on x86 idea of calling init_idle() on the idle task when it's re-used which also resets the preempt count amongst other things dump: BUG: scheduling while atomic: swapper/0/0x00000002 Modules linked in: Backtrace: [] (dump_backtrace+0x0/0x110) from [] (dump_stack+0x18/0x1c) r7:c02149e4 r6:c033df00 r5:c7836000 r4:00000000 [] (dump_stack+0x0/0x1c) from [] (__schedule_bug+0x60/0x70) [] (__schedule_bug+0x0/0x70) from [] (schedule+0x98/0x7b8) r5:c7836000 r4:c7836000 [] (schedule+0x0/0x7b8) from [] (cpu_idle+0xb4/0xd4) # [] (cpu_idle+0x0/0xd4) from [] (secondary_start_kernel+0xe0/0xf0) r5:c7836000 r4:c0205f40 [] (secondary_start_kernel+0x0/0xf0) from [] (prm_rmw_mod_reg_bits+0x88/0xa4) r7:c02149e4 r6:00000001 r5:00000001 r4:c7836000 Backtrace aborted due to bad frame pointer Cc: Catalin Marinas Signed-off-by: Santosh Shilimkar Signed-off-by: Russell King

ARM: Add L2 cache handling to smp boot support

2010-03-14T19:42:35Z

The page table and secondary data which we're asking the secondary CPU to make use of has to hit RAM to ensure that the secondary CPU can see it since it may not be taking part in coherency or cache searches at this point. Acked-by: Santosh Shilimkar Signed-off-by: Russell King