linux-toradex.git/arch/ia64/kernel/paravirt.c, branch v3.12

static keys: Introduce 'struct static_key', static_key_true()/false() and static_key_slow_[inc|dec]()

2012-02-24T09:05:59+00:00

So here's a boot tested patch on top of Jason's series that does
all the cleanups I talked about and turns jump labels into a
more intuitive to use facility. It should also address the
various misconceptions and confusions that surround jump labels.

Typical usage scenarios:

        #include 

        struct static_key key = STATIC_KEY_INIT_TRUE;

        if (static_key_false(&key))
                do unlikely code
        else
                do likely code

Or:

        if (static_key_true(&key))
                do likely code
        else
                do unlikely code

The static key is modified via:

        static_key_slow_inc(&key);
        ...
        static_key_slow_dec(&key);

The 'slow' prefix makes it abundantly clear that this is an
expensive operation.

I've updated all in-kernel code to use this everywhere. Note
that I (intentionally) have not pushed through the rename
blindly through to the lowest levels: the actual jump-label
patching arch facility should be named like that, so we want to
decouple jump labels from the static-key facility a bit.

On non-jump-label enabled architectures static keys default to
likely()/unlikely() branches.

Signed-off-by: Ingo Molnar 
Acked-by: Jason Baron 
Acked-by: Steven Rostedt 
Cc: a.p.zijlstra@chello.nl
Cc: mathieu.desnoyers@efficios.com
Cc: davem@davemloft.net
Cc: ddaney.cavm@gmail.com
Cc: Linus Torvalds 
Link: http://lkml.kernel.org/r/20120222085809.GA26397@elte.hu
Signed-off-by: Ingo Molnar

ia64: add jump labels for paravirt

2011-07-14T09:59:45+00:00

Since in a later patch I intend to call jump labels inside
CONFIG_PARAVIRT, IA64 would fail to compile if they are not
provided. This patch provides those jump labels for the IA64
architecture.

Signed-off-by: Glauber Costa 
Acked-by: Isaku Yamahata 
Acked-by: Rik van Riel 
CC: Tony Luck 
CC: Eddie Dong 
CC: Jeremy Fitzhardinge 
CC: Peter Zijlstra 
CC: Anthony Liguori 
CC: Eric B Munson 
Signed-off-by: Avi Kivity

ia64: remove some warnings.

2009-03-27T18:11:04+00:00

This patch removes the following warnings and related ones.
Plus some cosmetics.

arch/ia64/kernel/patch.c:112: warning: passing argument 1 of 'paravirt_fc' makes integer from pointer without a cast
arch/ia64/kernel/patch.c:135: warning: passing argument 1 of 'paravirt_fc' makes integer from pointer without a cast
arch/ia64/kernel/patch.c:166: warning: passing argument 1 of 'paravirt_fc' makes integer from pointer without a cast
arch/ia64/kernel/patch.c:202: warning: passing argument 1 of 'paravirt_fc' makes integer from pointer without a cast
arch/ia64/kernel/patch.c:220: warning: passing argument 1 of 'paravirt_fc' makes integer from pointer without a cast

Signed-off-by: Isaku Yamahata 
Signed-off-by: Tony Luck

ia64/pv_ops: implement binary patching optimization for native.

2009-03-26T18:02:42+00:00

implement binary patching optimization for pv_cpu_ops.
With this optimization, indirect call for pv_cpu_ops methods can be
converted into inline execution or direct call.

Signed-off-by: Isaku Yamahata 
Signed-off-by: Tony Luck

ia64/pv_ops/pv_time_ops: add sched_clock hook.

2009-03-26T17:50:42+00:00

add sched_clock() hook to paravirtualize sched_clock().
ia64 sched_clock() is based on ar.itc which isn't stable
on virtualized environment because vcpu may move around on
pcpus. So it needs paravirtualization.

Signed-off-by: Isaku Yamahata 
Signed-off-by: Tony Luck

[IA64] ia64/pv_ops/pv_cpu_ops: fix _IA64_REG_IP case.

2008-11-20T21:41:20+00:00

pv_cpu_ops.getreg(_IA64_REG_IP) returned constant.
But the returned ip valued should be the one in the caller, not of the callee.
This patch fixes that.

Signed-off-by: Isaku Yamahata 
Signed-off-by: Tony Luck

ia64/pv_ops: avoid name conflict of get_irq_chip().

2008-10-17T16:50:55+00:00

The macro get_irq_chip() is defined in linux/include/linux/irq.h
which cause name conflict with one in linux/arch/ia64/include/asm/paravirt.h.
rename the latter to __get_irq_chip().

Signed-off-by: Isaku Yamahata 
Signed-off-by: Tony Luck

[IA64] pvops: add to hooks, pv_time_ops, for steal time accounting.

2008-05-27T22:11:42+00:00

Introduce pv_time_ops which adds hook to steal time accounting.
On virtualized environment, cpus are shared by many guests and
steal time is the time which is used for other guests.
On virtualized environtment, streal time should be accounted.

Signed-off-by: Isaku Yamahata 
Signed-off-by: Tony Luck

[IA64] pvops: add hooks, pv_irq_ops, to paravirtualized irq related operations.

2008-05-27T22:11:10+00:00

introduce pv_irq_ops which adds hooks to paravirtualize irq related
operations.
On virtualized environment, interruption may be replaced by something
virtualization friendly. So the irq related operation also may need
paravirtualization.
This patch adds necessary hooks to paravirtualize irq related operations.

Signed-off-by: Yaozu (Eddie) Dong 
Signed-off-by: Isaku Yamahata 
Signed-off-by: Tony Luck

[IA64] pvops: add hooks, pv_iosapic_ops, to paravirtualize iosapic.

2008-05-27T22:10:41+00:00

add hooks to paravirtualize iosapic which is a real hardware resource.
On virtualized environment it may be replaced something virtualized
friendly.
Define pv_iosapic_ops and add the hooks.

Signed-off-by: Isaku Yamahata 
Signed-off-by: Tony Luck