linux-kernel - Re: [PATCH] math-emu/setcc: avoid gcc extension

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Message-Id: <20070107111900.9d434162.randy.dunlap@oracle.com>
Date:	Sun, 7 Jan 2007 11:19:00 -0800
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Segher Boessenkool <segher@...nel.crashing.org>
Cc:	akpm <akpm@...l.org>, lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] math-emu/setcc: avoid gcc extension

On Sun, 7 Jan 2007 20:12:42 +0100 Segher Boessenkool wrote:

> There's an extra tab in that last line.  Could you also
> please fix the indenting (use a tab, not spaces) -- I know
> it was there originally, but since there are only a few
> lines in that file like that...  :-)

how's this one?
---
From: Randy Dunlap <randy.dunlap@...cle.com>

setcc() in math-emu is written as a gcc extension statement expression
macro that returns a value.  However, it's not used that way and it's
not needed like that, so just make it a do-while non-extension macro
so that we don't use an extension when it's not needed.

Signed-off-by: Randy Dunlap <randy.dunlap@...cle.com>
---
 arch/i386/math-emu/status_w.h        |    5 +++--

---
 arch/i386/math-emu/status_w.h |    7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

--- linux-2620-rc2.orig/arch/i386/math-emu/status_w.h
+++ linux-2620-rc2/arch/i386/math-emu/status_w.h
@@ -48,9 +48,10 @@
 
 #define status_word() \
   ((partial_status & ~SW_Top & 0xffff) | ((top << SW_Top_Shift) & SW_Top))
-#define setcc(cc) ({ \
-  partial_status &= ~(SW_C0|SW_C1|SW_C2|SW_C3); \
-  partial_status |= (cc) & (SW_C0|SW_C1|SW_C2|SW_C3); })
+#define setcc(cc) do { \
+	partial_status &= ~(SW_C0|SW_C1|SW_C2|SW_C3); \
+	partial_status |= (cc) & (SW_C0|SW_C1|SW_C2|SW_C3); \
+} while (0)
 
 #ifdef PECULIAR_486
    /* Default, this conveys no information, but an 80486 does it. */

-
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