linux-toradex.git/arch/powerpc/xmon, branch v3.0.44

powerpc/xmon: Use cpumask iterator to avoid warning

2012-07-16T15:47:35+00:00

commit bc1d7702910c7c7e88eb60b58429dbfe293683ce upstream.

We have a bug report where the kernel hits a warning in the cpumask
code:

WARNING: at include/linux/cpumask.h:107

Which is:
        WARN_ON_ONCE(cpu >= nr_cpumask_bits);

The backtrace is:
        cpu_cmd
        cmds
        xmon_core
        xmon
        die

xmon is iterating through 0 to NR_CPUS. I'm not sure why we are still
open coding this but iterating above nr_cpu_ids is definitely a bug.

This patch iterates through all possible cpus, in case we issue a
system reset and CPUs in an offline state call in.

Perhaps the old code was trying to handle CPUs that were in the
partition but were never started (eg kexec into a kernel with an
nr_cpus= boot option). They are going to die way before we get into
xmon since we haven't set any kernel state up for them.

Signed-off-by: Anton Blanchard 
Signed-off-by: Benjamin Herrenschmidt 
Signed-off-by: Greg Kroah-Hartman

powerpc: Remove call sites of MSG_ALL_BUT_SELF

2011-05-19T04:30:46+00:00

The only user of MSG_ALL_BUT_SELF in the whole kernel tree is powerpc,
and it only uses it to start the debugger. Both debuggers always call
smp_send_debugger_break with MSG_ALL_BUT_SELF, and only mpic can do
anything more optimal than a loop over all online cpus, but all message
passing implementations have to code for this special delivery target.

Convert smp_send_debugger_break to take void and loop calling the smp_ops
message_pass function for each of the other cpus in the online cpumask.

Use raw_smp_processor_id() because we are either entering the debugger
or trying to start kdump and the additional warning it not useful were
it to trigger.

Signed-off-by: Milton Miller 
Signed-off-by: Benjamin Herrenschmidt

powerpc: Convert old cpumask API into new one

2011-05-04T05:22:59+00:00

Adapt new API.

Almost change is trivial. Most important change is the below line
because we plan to change task->cpus_allowed implementation.

-       ctx->cpus_allowed = current->cpus_allowed;

Signed-off-by: KOSAKI Motohiro 
Signed-off-by: Benjamin Herrenschmidt

powerpc: Save Come-From Address Register (CFAR) in exception frame

2011-05-04T05:22:09+00:00

Recent 64-bit server processors (POWER6 and POWER7) have a "Come-From
Address Register" (CFAR), that records the address of the most recent
branch or rfid (return from interrupt) instruction for debugging purposes.

This saves the value of the CFAR in the exception entry code and stores
it in the exception frame.  We also make xmon print the CFAR value in
its register dump code.

Rather than extend the pt_regs struct at this time, we steal the orig_gpr3
field, which is only used for system calls, and use it for the CFAR value
for all exceptions/interrupts other than system calls.  This means we
don't save the CFAR on system calls, which is not a great problem since
system calls tend not to happen unexpectedly, and also avoids adding the
overhead of reading the CFAR to the system call entry path.

Signed-off-by: Paul Mackerras 
Signed-off-by: Benjamin Herrenschmidt

powerpc: Free up some CPU feature bits by moving out MMU-related features

2011-04-27T04:18:52+00:00

Some of the 64bit PPC CPU features are MMU-related, so this patch moves
them to MMU_FTR_ bits.  All cpu_has_feature()-style tests are moved to
mmu_has_feature(), and seven feature bits are freed as a result.

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

powerpc: Use MSR_64BIT in places

2011-04-27T04:18:44+00:00

Use the new MSR_64BIT in a few places. Some of these are already ifdef'ed
for BOOKE vs BOOKS, but it's still clearer, MSR_SF does not immediately
parse as "MSR bit for 64bit".

Signed-off-by: Michael Ellerman 
Signed-off-by: Benjamin Herrenschmidt

lib, arch: add filter argument to show_mem and fix private implementations

2011-03-25T00:49:37+00:00

Commit ddd588b5dd55 ("oom: suppress nodes that are not allowed from
meminfo on oom kill") moved lib/show_mem.o out of lib/lib.a, which
resulted in build warnings on all architectures that implement their own
versions of show_mem():

	lib/lib.a(show_mem.o): In function `show_mem':
	show_mem.c:(.text+0x1f4): multiple definition of `show_mem'
	arch/sparc/mm/built-in.o:(.text+0xd70): first defined here

The fix is to remove __show_mem() and add its argument to show_mem() in
all implementations to prevent this breakage.

Architectures that implement their own show_mem() actually don't do
anything with the argument yet, but they could be made to filter nodes
that aren't allowed in the current context in the future just like the
generic implementation.

Reported-by: Stephen Rothwell 
Reported-by: James Bottomley 
Suggested-by: Andrew Morton 
Signed-off-by: David Rientjes 
Signed-off-by: Linus Torvalds

powerpc/Makefiles: Change to new flag variables

2010-10-13T05:19:22+00:00

Replace EXTRA_CFLAGS with ccflags-y and EXTRA_AFLAGS with asflags-y.

Signed-off-by: matt mooney 
Signed-off-by: Benjamin Herrenschmidt

Input: sysrq - drop tty argument from sysrq ops handlers

2010-08-20T05:07:06+00:00

Noone is using tty argument so let's get rid of it.

Acked-by: Alan Cox 
Acked-by: Jason Wessel 
Acked-by: Greg Kroah-Hartman 
Signed-off-by: Dmitry Torokhov

powerpc/book3e: Add TLB dump in xmon for Book3E

2010-07-14T04:13:52+00:00

Signed-off-by: Benjamin Herrenschmidt