linux-kernel - [RFC local_t removal V2 0/3] Remove local

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Date:	Thu, 07 Jan 2010 16:35:24 -0600
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Cc:	linux-kernel@...r.kernel.org
Subject: [RFC local_t removal V2 0/3] Remove local_t

Current -next has only the trace subsystem left as a user of local_t

Tracing uses local_t for per cpu safe atomic operations in the form
of cmpxchg and additions.

This patchset removes unused function in local.h and then genericizes
local.h by removing local_t. This results in a very small set of
functions.

"long" is used for now instead of local_t. With some additional work it
would be possible to pass arbitrary types to local_xx() function like
cmpxchg_local() and the this_cpu_xx() functions. Maybe a more flexible
way of handling local_xx() would allow the use of these functions in
other kernel subsystems.

Still RFC state. Lots of stuff todo. Compiles on my box.

V1->V2
 - Preserve local.h
 - Add a rationale why the remaining functions are useful and how
   they differ from this_cpu_xx.

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