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| author | Tejun Heo <tj@kernel.org> | 2014-06-18 01:12:33 +0200 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2014-06-18 01:12:33 +0200 |
| commit | 6adc5cac538b5d9162d8bcdb6145319592afc0d6 (patch) | |
| tree | a527bfaa21feab1417b31f135c406c92d776b56a /include/asm-generic/percpu.h | |
| parent | epoll: fix use-after-free in eventpoll_release_file (diff) | |
| download | linux-6adc5cac538b5d9162d8bcdb6145319592afc0d6.tar.xz linux-6adc5cac538b5d9162d8bcdb6145319592afc0d6.zip | |
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: Tejun Heo <tj@kernel.org>
Acked-by: Christoph Lameter <cl@linux.com>
Diffstat (limited to 'include/asm-generic/percpu.h')
| -rw-r--r-- | include/asm-generic/percpu.h | 9 |
1 files changed, 3 insertions, 6 deletions
diff --git a/include/asm-generic/percpu.h b/include/asm-generic/percpu.h index 0703aa75b5e8..63d2b68c826e 100644 --- a/include/asm-generic/percpu.h +++ b/include/asm-generic/percpu.h @@ -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 |