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Commit 6adc5cac authored by Tejun Heo's avatar Tejun Heo
Browse files

percpu: disallow archs from overriding SHIFT_PERCPU_PTR() 



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: default avatarTejun Heo <tj@kernel.org>
Acked-by: default avatarChristoph Lameter <cl@linux.com>
parent ebe06187

include/asm-generic/percpu.h

+3 −6
Original line number Diff line number Diff line
@@ -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