From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: Mon, 26 Mar 2012 15:27:01 +0000 (-0400)
Subject: Fix uatomic sign cast
X-Git-Tag: v0.6.9~3
X-Git-Url: http://git.liburcu.org/?a=commitdiff_plain;h=ecf2edf639926ad2a7842ebe1e6c456cc106e4c0;hp=ecf2edf639926ad2a7842ebe1e6c456cc106e4c0;p=userspace-rcu.git

Fix uatomic sign cast

Passing an unsigned int to uatomic_sub does not honor sign extend to
long, as we should be allowed by assume.

Fix this by introducing caa_cast_long_keep_sign(), which casts either to
long or unsigned long depending on the signedness of the argument
received. It is used in uatomic_sub before applying the "-" operator,
since this operator needs to operate on the "long" type size (since sign
extension might not be performed if the argument received is unsigned).

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
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