From: Chris Metcalf <cmetcalf@tilera.com>
Date: Fri, 25 May 2012 16:32:09 +0000 (-0400)
Subject: tile: fix bug where fls(0) was not returning 0
X-Git-Tag: v3.2.19~17
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=10c9eea8f9831180c52bfbb0ddf9af6e51989a41;p=pandora-kernel.git

tile: fix bug where fls(0) was not returning 0

commit 9f1d62bed7f015d11b9164078b7fea433b474114 upstream.

This is because __builtin_clz(0) returns 64 for the "undefined" case
of 0, since the builtin just does a right-shift 32 and "clz" instruction.
So, use the alpha approach of casting to u32 and using __builtin_clzll().

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
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