linux-kernel - [PATCH] ata: replace macro with static inline in libata.h

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Message-Id: <1203350873.5757.23.camel@brick>
Date:	Mon, 18 Feb 2008 08:07:53 -0800
From:	Harvey Harrison <harvey.harrison@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Jeff Garzik <jeff@...zik.org>, Alan Cox <alan@...rguk.ukuu.org.uk>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] ata: replace macro with static inline in libata.h

Avoid ~70 sparse warnings like:
drivers/ata/pata_ali.c:176:14: warning: symbol '__x' shadows an earlier one
drivers/ata/pata_ali.c:176:14: originally declared here

Due to nesting min_t macro inside max_t macro which both use a __x
identifier internally.

Signed-off-by: Harvey Harrison <harvey.harrison@...il.com>
---
Andrew, here is a patch that drastically reduces the number of sparse
warnings in libata.  Alan Cox has suggested a clamp_t macro be added
to kernel.h instead to avoid this issue.  I don't believe Jeff Garzik
has given an opinion yet (other than not applying it when originally
sent this was 5/11 of the libata sparse warnings)

 include/linux/libata.h |    9 ++++++++-
 1 files changed, 8 insertions(+), 1 deletions(-)

diff --git a/include/linux/libata.h b/include/linux/libata.h
index bc5a8d0..b5590fb 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -764,7 +764,14 @@ struct ata_timing {
 	unsigned short udma;		/* t2CYCTYP/2 */
 };
 
-#define FIT(v, vmin, vmax)	max_t(short, min_t(short, v, vmax), vmin)
+static inline short FIT(short v, short vmin, short vmax)
+{
+	if (v >= vmax)
+		return vmax;
+	if (v <= vmin)
+		return vmin;
+	return v;
+}
 
 extern const unsigned long sata_deb_timing_normal[];
 extern const unsigned long sata_deb_timing_hotplug[];
-- 
1.5.4.1.1278.gc75be



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