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SubjectRe: [PATCH 1/1] x86: Change _node_to_cpumask_ptr to return const ptr

On Tue, Jul 8, 2008 at 7:06 PM, Mike Travis <> wrote:
>> (v3 is applied already so Mike please send a delta to v3.)
>> Ingo
> Subject: [PATCH 1/1] x86: Change _node_to_cpumask_ptr to return const ptr
> * Strengthen the return type for the _node_to_cpumask_ptr to be
> a const pointer. This adds compiler checking to insure that
> node_to_cpumask_map[] is not changed inadvertently.
> Applies to tip/master with the following patch applied:
> "[PATCH 1/1] x86: Add check for node passed to node_to_cpumask V3"
> Signed-off-by: Mike Travis <>
> ---
> Note: I did not change node_to_cpumask_ptr() in include/asm-generic/topology.h
> as node_to_cpumask_ptr_next() does change the cpumask value.

Hmmm. Does it really?

#define node_to_cpumask_ptr_next(v, node) \
_##v = node_to_cpumask(node)

This doesn't seem to modify it?

Also, isn't it unfortunate to have the same function return
const/non-const depending on your arch/config?


"The animistic metaphor of the bug that maliciously sneaked in while
the programmer was not looking is intellectually dishonest as it
disguises that the error is the programmer's own creation."
-- E. W. Dijkstra, EWD1036

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