Re: [PATCH] alpha build pm_power_off hack

[ebiederm@xmission.com (Eric W. Biederman)]

Paul Jackson <pj@sgi.com> writes:

> Eric wrote:
>> Taking a quick glance at alpha causes me to think we always
>> want pm_power_off to be non null on alpha.
>
> So I presume you think that some alpha person should write
> such a function?

Sorry I had about 5 minutes to do something when this issue
came up and unfortunately I knew how to solve it cleanly :(
So I wrote the patch.  It was my hope that by putting it into
-mm I could sucker someone with some time into doing fixing
the architectures that broke.

I think what we want is one of the too patches below.  Basically
something that just sets pm_power_off to a non NULL value is
enough to continue the alphas current behaviour.

> I can't quite guess whether you are agreeing with my patch,
> or disagreeing with it.

Disagreeing in saying it didn't quite go far enough pm_power_off
should be initialized on alpha.

> At the very least, I don't want to leave the crosstools build
> of alpha with a default config broken.

That is a good point.  But I really don't want to see a fix that
just blindly fixes a build issue.  When it takes about 10 minutes
to audit machine_power_off and see what really needs to be done.

To that extent I have hacked up your patch two different ways
one of them should be usable.  I'm just not certain which non-zero
initializer I like better.  The second setting pm_power_off to
machine_power_off is what the powerpc port currently does.

Eric


---

 arch/alpha/kernel/process.c |    5 +++++
 1 files changed, 5 insertions(+)

--- 2.6.15-rc5-mm2.orig/arch/alpha/kernel/process.c 2005-12-11
15:07:52.000000000 -0800
+++ 2.6.15-rc5-mm2/arch/alpha/kernel/process.c 2005-12-11 15:09:33.000000000
-0800
@@ -43,6 +43,11 @@
 #include "proto.h"
 #include "pci_impl.h"
 
+/*
+ * Power off function, alpha doesn't use but we should
+ * always call machine_power_off.
+ */
+void (*pm_power_off)(void) = ERR_PTR(-EINVAL);
+
 void
 cpu_idle(void)
 {

---

 arch/alpha/kernel/process.c |    5 +++++
 1 files changed, 5 insertions(+)

--- 2.6.15-rc5-mm2.orig/arch/alpha/kernel/process.c 2005-12-11
15:07:52.000000000 -0800
+++ 2.6.15-rc5-mm2/arch/alpha/kernel/process.c 2005-12-11 15:09:33.000000000
-0800
@@ -43,6 +43,11 @@
 #include "proto.h"
 #include "pci_impl.h"
 
+/*
+ * Power off function, alpha doesn't use but we should
+ * always call machine_power_off.
+ */
+void (*pm_power_off)(void) = machine_power_off;
+
 void
 cpu_idle(void)
 {