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| author | Nick Bowler <nbowler@elliptictech.com> | 2011-08-24 18:55:37 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2011-10-17 09:12:41 +0100 |
| commit | b3377d1865723cea5334954e6ffcb2182b6689c8 (patch) | |
| tree | e7c5dbe9e9daecf7c419e5302e11eb1e56e0575f /arch | |
| parent | ef4c53687e0adf5409896c4fa688b15f8d4dc0c0 (diff) | |
| download | lwn-b3377d1865723cea5334954e6ffcb2182b6689c8.tar.gz lwn-b3377d1865723cea5334954e6ffcb2182b6689c8.zip | |
ARM: 7064/1: vexpress: Use wfi macro in platform_do_lowpower.
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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/mach-vexpress/hotplug.c | 9 |
1 files changed, 2 insertions, 7 deletions
diff --git a/arch/arm/mach-vexpress/hotplug.c b/arch/arm/mach-vexpress/hotplug.c index ea4cbfb90a66..3668cf91d2de 100644 --- a/arch/arm/mach-vexpress/hotplug.c +++ b/arch/arm/mach-vexpress/hotplug.c @@ -13,6 +13,7 @@ #include <linux/smp.h> #include <asm/cacheflush.h> +#include <asm/system.h> extern volatile int pen_release; @@ -62,13 +63,7 @@ static inline void platform_do_lowpower(unsigned int cpu, int *spurious) * code will have already disabled interrupts */ for (;;) { - /* - * here's the WFI - */ - asm(".word 0xe320f003\n" - : - : - : "memory", "cc"); + wfi(); if (pen_release == cpu) { /* |