linux-kernel - [PATCH 4/5] x86: desc

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Message-Id: <20071121102302.E5E6C26F8BE@magilla.localdomain>
Date:	Wed, 21 Nov 2007 02:23:02 -0800 (PST)
From:	Roland McGrath <roland@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH 4/5] x86: desc_empty


This replaces the desc_empty macro with an inline.  It now handles
easily any of the four different types used between 32/64 code to
refer to these 8 bytes.  It's identical in both asm-x86/processor_64.h
and asm-x86/processor_32.h, so if these files ever get merged this
function can be in the common code.

This also removes the desc_equal macro because nothing uses it.

Signed-off-by: Roland McGrath <roland@...hat.com>

diff --git a/include/asm-x86/processor_32.h b/include/asm-x86/processor_32.h
index 13976b0..34e8063 100644
--- a/include/asm-x86/processor_32.h
+++ b/include/asm-x86/processor_32.h
@@ -30,11 +30,12 @@ struct desc_struct {
 	unsigned long a,b;
 };
 
-#define desc_empty(desc) \
-		(!((desc)->a | (desc)->b))
+static inline int desc_empty(const void *ptr)
+{
+	const u32 *desc = ptr;
+	return !(desc[0] | desc[1]);
+}
 
-#define desc_equal(desc1, desc2) \
-		(((desc1)->a == (desc2)->a) && ((desc1)->b == (desc2)->b))
 /*
  * Default implementation of macro that returns current
  * instruction pointer ("program counter").
diff --git a/include/asm-x86/processor_64.h b/include/asm-x86/processor_64.h
index e4f1997..2dd739a 100644
--- a/include/asm-x86/processor_64.h
+++ b/include/asm-x86/processor_64.h
@@ -32,11 +32,11 @@
 #define VIP_MASK	0x00100000	/* virtual interrupt pending */
 #define ID_MASK		0x00200000
 
-#define desc_empty(desc) \
-               (!((desc)->a | (desc)->b))
-
-#define desc_equal(desc1, desc2) \
-               (((desc1)->a == (desc2)->a) && ((desc1)->b == (desc2)->b))
+static inline int desc_empty(const void *ptr)
+{
+	const u32 *desc = ptr;
+	return !(desc[0] | desc[1]);
+}
 
 /*
  * Default implementation of macro that returns current
-
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