kernel.git/arch/s390/include/asm/percpu.h, branch linux-3.10.y

s390/cmpxchg,percpu: implement cmpxchg_double()

2012-09-26T13:45:25Z

Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky

s390/percpu: implement this_cpu_add_return()

2012-09-26T13:45:25Z

Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky

s390/percpu: implement this_cpu_xchg()

2012-09-26T13:45:24Z

The generic variant has a local_irq_save/restore pair which is quite expensive. It is sufficient to disable preemption, which is a no-op with !CONFIG_PREEMPT and then use the regular xchg macro. Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky

s390/headers: replace s390x with CONFIG_64BIT where possible

2012-05-24T08:10:10Z

Replace __s390x__ with CONFIG_64BIT in all places that are not exported to userspace or guarded with #ifdef __KERNEL__. Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky

percpu: Remove irqsafe_cpu_xxx variants

2011-12-22T18:40:20Z

We simply say that regular this_cpu use must be safe regardless of preemption and interrupt state. That has no material change for x86 and s390 implementations of this_cpu operations. However, arches that do not provide their own implementation for this_cpu operations will now get code generated that disables interrupts instead of preemption. -tj: This is part of on-going percpu API cleanup. For detailed discussion of the subject, please refer to the following thread. http://thread.gmane.org/gmane.linux.kernel/1222078 Signed-off-by: Christoph Lameter Signed-off-by: Tejun Heo LKML-Reference:

[S390] percpu: implement arch specific irqsafe_cpu_ops

2011-05-23T08:24:29Z

Implement arch specific irqsafe_cpu ops. The arch specific ops do not disable/enable interrupts since that is an expensive operation. Instead we disable preemption and perform a compare and swap loop. Since on server distros (the ones we care about) preemption is disabled the preempt_disable()/preempt_enable() pair is a nop. In the end this code should be faster than the generic one. Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky

s390: switch to dynamic percpu allocator

2009-06-24T06:13:53Z

64bit s390 shares the same problem with alpha regarding percpu symbol addressing from modules. It needs assembly magic to force GOTENT reference when building module as the percpu address will be outside the usual 4G range from the module text. This can be solved by using weak percpu variable definitions. This patch makes s390 use weak definitions and switch to dynamic percpu allocator. Please note that weak attribute is not added if !SMP as percpu variables behave exactly the same as normal variables on UP. Compile tested. Generation of GOTENT reference verified. This patch is based on Ivan Kokshaysky's alpha percpu patch. [ Impact: use dynamic percpu allocator ] Signed-off-by: Tejun Heo Cc: Martin Schwidefsky Cc: Heiko Carstens

[S390] move include/asm-s390 to arch/s390/include/asm

2008-08-01T18:42:05Z

Signed-off-by: Martin Schwidefsky