提交 90140c30 编写于 作者: R Russell King

ARM: Fix __cpuexit section mismatch warnings

Fix:

WARNING: vmlinux.o(.text+0x247c): Section mismatch in reference from the function cpu_idle() to the function .cpuexit.text:cpu_die()
The function cpu_idle() references a function in an exit section.
Often the function cpu_die() has valid usage outside the exit section
and the fix is to remove the __cpuexit annotation of cpu_die.

WARNING: vmlinux.o(.cpuexit.text+0x3c): Section mismatch in reference from the function cpu_die() to the function .cpuinit.text:secondary_start_kernel()
The function __cpuexit cpu_die() references
a function __cpuinit secondary_start_kernel().
This is often seen when error handling in the exit function
uses functionality in the init path.
The fix is often to remove the __cpuinit annotation of
secondary_start_kernel() so it may be used outside an init section.

Sam says:
> The annotation of cpu_die() is wrong.
> To be annotated __cpuexit the function shall:
> - be used in exit context and only in exit context with HOTPLUG_CPU=n
> - be used outside exit context with HOTPLUG_CPU=y

So, this also means __cpu_disable(), __cpu_die() and twd_timer_stop() are
also wrong.  However, removing __cpuexit from cpu_die() creates:

WARNING: vmlinux.o(.text+0x6834): Section mismatch in reference from the function cpu_die() to the function .cpuinit.text:secondary_start_kernel()
The function cpu_die() references
the function __cpuinit secondary_start_kernel().
This is often because cpu_die lacks a __cpuinit
annotation or the annotation of secondary_start_kernel is wrong.

so fix this using __ref.
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
Acked-by: NSam Ravnborg <sam@ravnborg.org>
上级 e616c591
......@@ -154,7 +154,7 @@ int __cpuinit __cpu_up(unsigned int cpu)
/*
* __cpu_disable runs on the processor to be shutdown.
*/
int __cpuexit __cpu_disable(void)
int __cpu_disable(void)
{
unsigned int cpu = smp_processor_id();
struct task_struct *p;
......@@ -201,7 +201,7 @@ int __cpuexit __cpu_disable(void)
* called on the thread which is asking for a CPU to be shutdown -
* waits until shutdown has completed, or it is timed out.
*/
void __cpuexit __cpu_die(unsigned int cpu)
void __cpu_die(unsigned int cpu)
{
if (!platform_cpu_kill(cpu))
printk("CPU%u: unable to kill\n", cpu);
......@@ -215,7 +215,7 @@ void __cpuexit __cpu_die(unsigned int cpu)
* of the other hotplug-cpu capable cores, so presumably coming
* out of idle fixes this.
*/
void __cpuexit cpu_die(void)
void __ref cpu_die(void)
{
unsigned int cpu = smp_processor_id();
......
......@@ -166,10 +166,12 @@ void __cpuinit twd_timer_setup(struct clock_event_device *clk)
clockevents_register_device(clk);
}
#ifdef CONFIG_HOTPLUG_CPU
/*
* take a local timer down
*/
void __cpuexit twd_timer_stop(void)
void twd_timer_stop(void)
{
__raw_writel(0, twd_base + TWD_TIMER_CONTROL);
}
#endif
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