linux-toradex.git/arch/powerpc/kernel/machine_kexec_64.c, branch v3.10

powerpc/kexec: Fix kexec when using VMX optimised memcpy

2013-05-14T04:36:23+00:00

commit b3f271e86e5a (powerpc: POWER7 optimised memcpy using VMX and
enhanced prefetch) uses VMX when it is safe to do so (ie not in
interrupt). It also looks at the task struct to decide if we have to
save the current tasks' VMX state.

kexec calls memcpy() at a point where the task struct may have been
overwritten by the new kexec segments. If it has been overwritten
then when memcpy -> enable_altivec looks up current->thread.regs->msr
we get a cryptic oops or lockup.

I also notice we aren't initialising thread_info->cpu, which means
smp_processor_id is broken. Fix that too.

Signed-off-by: Anton Blanchard 
Cc:  # 3.6+
Signed-off-by: Benjamin Herrenschmidt

powerpc/kexec: Disable hard IRQ before kexec

2013-02-23T16:49:28+00:00

Disable hard IRQ before kexec a new kernel image.
Not doing it can result in corrupted data in the memory segments
reserved for the new kernel.

Signed-off-by: Phileas Fogg 
CC: 
Signed-off-by: Benjamin Herrenschmidt

powerpc+of: Rename the drivers/of prom_* functions to of_*

2012-11-15T01:56:52+00:00

Rename the prom_*_property routines of the generic OF code to of_*_property.
This brings them in line with the naming used by the rest of the OF code.

Signed-off-by: Nathan Fontenot 
Acked-by: Geoff Levand 
Acked-by: Rob Herring 
Acked-by: Grant Likely 
Signed-off-by: Benjamin Herrenschmidt

treewide: convert uses of ATTRIB_NORETURN to __noreturn

2012-01-13T04:13:03+00:00

Use the more commonly used __noreturn instead of ATTRIB_NORETURN.

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Joe Perches 
Cc: Ingo Molnar 
Cc: Peter Zijlstra 
Cc: Haavard Skinnemoen 
Cc: Hans-Christian Egtvedt 
Cc: Tony Luck 
Cc: Fenghua Yu 
Acked-by: Geert Uytterhoeven 
Acked-by: Ralf Baechle 
Cc: Benjamin Herrenschmidt 
Cc: Paul Mackerras 
Cc: Martin Schwidefsky 
Cc: Heiko Carstens 
Cc: Chris Metcalf 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

treewide: remove useless NORET_TYPE macro and uses

2012-01-13T04:13:03+00:00

It's a very old and now unused prototype marking so just delete it.

Neaten panic pointer argument style to keep checkpatch quiet.

Signed-off-by: Joe Perches 
Cc: Ingo Molnar 
Cc: Peter Zijlstra 
Cc: Haavard Skinnemoen 
Cc: Hans-Christian Egtvedt 
Cc: Tony Luck 
Cc: Fenghua Yu 
Acked-by: Geert Uytterhoeven 
Acked-by: Ralf Baechle 
Cc: Benjamin Herrenschmidt 
Cc: Paul Mackerras 
Cc: Martin Schwidefsky 
Cc: Heiko Carstens 
Cc: Chris Metcalf 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

powerpc: Use for_each_node_by_type instead of open coding it

2011-09-20T05:53:23+00:00

Use for_each_node_by_type instead of open coding it.

Signed-off-by: Anton Blanchard 
Signed-off-by: Benjamin Herrenschmidt

powerpc/kexec: Fix orphaned offline CPUs across kexec

2010-07-31T05:05:22+00:00

When CPU hotplug is used, some CPUs may be offline at the time a kexec is
performed.  The subsequent kernel may expect these CPUs to be already running,
and will declare them stuck.  On pseries, there's also a soft-offline (cede)
state that CPUs may be in; this can also cause problems as the kexeced kernel
may ask RTAS if they're online -- and RTAS would say they are.  The CPU will
either appear stuck, or will cause a crash as we replace its cede loop beneath
it.

This patch kicks each present offline CPU awake before the kexec, so that
none are forever lost to these assumptions in the subsequent kernel.

Now, the behaviour is that all available CPUs that were offlined are now
online & usable after the kexec.  This mimics the behaviour of a full reboot
(on which all CPUs will be restarted).

Signed-off-by: Matt Evans 
Signed-off-by: Benjamin Herrenschmidt

powerpc/kexec: Add to and tidy debug/comments in machine_kexec64.c

2010-07-31T05:05:21+00:00

Tidies some typos, KERN_INFO-ise an info msg, and add a debug msg showing
when the final sequence starts.

Also adds a comment to kexec_prepare_cpus_wait() to make note of a possible
problem; the need for kexec to deal with CPUs that failed to originally start
up.

Signed-off-by: Matt Evans 
Signed-off-by: Benjamin Herrenschmidt

powerpc/kexec: Switch to a static PACA on the way out

2010-07-31T04:56:30+00:00

With dynamic PACAs, the kexecing CPU's PACA won't lie within the kernel
static data and there is a chance that something may stomp it when preparing
to kexec.  This patch switches this final CPU to a static PACA just before
we pull the switch.

Signed-off-by: Matt Evans 
Signed-off-by: Benjamin Herrenschmidt

Merge commit 'paulus-perf/master' into next

2010-07-09T01:25:48+00:00