From: Russell King <rmk+lkml@arm.linux.org.uk>
Date: Sat, 6 Jun 2009 21:47:11 +0000 (+0100)
Subject: kbuild: fix headers_exports with boolean expression
X-Git-Tag: v2.6.31-rc1~335^2~14
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=eedc9d83eaab2d35fb9dd1ec25b765dec964e26c;p=pandora-kernel.git

kbuild: fix headers_exports with boolean expression

When we had code like this in a header unifdef failed to
deduct that the expression was always false - and we had code exported
that was not intended for userspace.

#if defined(__KERNEL__) && !defined(__ASSEMBLY__)
  int a;
#endif

This commit implment support in unidef which allows it to work out if
an #if expression always evaluates true or false for symbols which
are being undefined/always defined.

The patch is slightly more complicated than I'd hoped because unifdef
needs to see lines fully evaluated - doing otherwise causes it to
mark the line as "dirty" and copy it over no matter what.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
---

Reading git-diff-tree failed