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percpu: disallow archs from overriding SHIFT_PERCPU_PTR()

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It has been about half a decade since all archs started using the
dynamic percpu allocator and thus the same SHIFT_PERCPU_PTR()
implementation.  There's no benefit in overriding SHIFT_PERCPU_PTR()
anymore.

Remove #ifndef around it to clarify that this is identical regardless
of the arch.

This patch doesn't cause any functional difference.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Christoph Lameter <cl@linux.com>
This commit is contained in:
Tejun Heo 2014-06-17 19:12:33 -04:00
parent ebe06187bf
commit 6adc5cac53
1 changed files with 3 additions and 6 deletions
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9
include/asm-generic/percpu.h
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@ -36,17 +36,14 @@ extern unsigned long __per_cpu_offset[NR_CPUS];
#endif
/*
* Add a offset to a pointer but keep the pointer as is.
*
* Only S390 provides its own means of moving the pointer.
* Add an offset to a pointer but keep the pointer as-is. Use RELOC_HIDE()
* to prevent the compiler from making incorrect assumptions about the
* pointer value. The weird cast keeps both GCC and sparse happy.
*/
#ifndef SHIFT_PERCPU_PTR
/* Weird cast keeps both GCC and sparse happy. */
#define SHIFT_PERCPU_PTR(__p, __offset) ({ \
__verify_pcpu_ptr((__p)); \
RELOC_HIDE((typeof(*(__p)) __kernel __force *)(__p), (__offset)); \
})
#endif
/*
* A percpu variable may point to a discarded regions. The following are