ARM: 7064/1: vexpress: Use wfi macro in platform_do_lowpower.

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Current Versatile Express CPU hotplug code includes a hardcoded WFI
instruction, in ARM encoding.  When the kernel is compiled in Thumb-2
mode, this is invalid and causes the machine to hang hard when a CPU
is offlined.

Using the wfi macro (which uses the appropriate assembler mnemonic)
causes the correct instruction to be emitted in either case.  As a
consequence of this change, an apparently vestigial "cc" clobber is
dropped from the asm (the macro uses "memory" only).

Signed-off-by: Nick Bowler <nbowler@elliptictech.com>
Reviewed-by: Jamie Iles <jamie@jamieiles.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

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Nick Bowler 2011-08-24 18:55:37 +01:00 • committed by Russell King

parent ef4c53687e

commit b3377d1865

1 changed files with 2 additions and 7 deletions

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arch/arm/mach-vexpress/hotplug.c

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