MIPS: Fix GCC-4.6 ‘set but not used’ warning in ieee754int.h [Linux 2.6.38]

This Linux kernel change "MIPS: Fix GCC-4.6 ‘set but not used’ warning in ieee754int.h" is included in the Linux 2.6.38 release. This change is authored by David Daney <ddaney [at] caviumnetworks.com> on Mon Jan 24 14:51:36 2011 -0800. The commit for this change in Linux stable tree is 91b51f3 (patch).

MIPS: Fix GCC-4.6 'set but not used' warning in ieee754int.h

GCC-4.6 can find more unused code than previous versions could.

In the case of arch/mips/math-emu/ieee754int.h, the COMPXSP and
COMPXDP macros are used in several places, but a couple of them leave
xs unused.  The easiest thing to do is mark it as __maybe_unused to
quiet the warning.

Signed-off-by: David Daney <ddaney@caviumnetworks.com>
To: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2032/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

There are 4 lines of Linux source code added/deleted in this change. Code changes to Linux kernel are as follows.

 arch/mips/math-emu/ieee754int.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/mips/math-emu/ieee754int.h b/arch/mips/math-emu/ieee754int.h
index 2701d95..2a7d43f 100644
--- a/arch/mips/math-emu/ieee754int.h
+++ b/arch/mips/math-emu/ieee754int.h
@@ -70,7 +70,7 @@

 #define COMPXSP 
-  unsigned xm; int xe; int xs; int xc
+  unsigned xm; int xe; int xs __maybe_unused; int xc

 #define COMPYSP 
   unsigned ym; int ye; int ys; int yc
@@ -104,7 +104,7 @@

 #define COMPXDP 
-u64 xm; int xe; int xs; int xc
+u64 xm; int xe; int xs __maybe_unused; int xc

 #define COMPYDP 
 u64 ym; int ye; int ys; int yc

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