linux-kernel - [PATCH] x86-64: make pda's cpunumber and nodenumber unsigned

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Date:	Thu, 13 Dec 2007 09:10:56 +0000
From:	"Jan Beulich" <jbeulich@...ell.com>
To:	<tglx@...utronix.de>, <mingo@...hat.com>, <hpa@...or.com>
Cc:	<linux-kernel@...r.kernel.org>
Subject: [PATCH] x86-64: make pda's cpunumber and nodenumber unsigned

This generally allows better code to be generated, since the zero-
extension during 32-bit operations comes for free (needed when the
result is used as array index or similar), whereas sign extension must
be done explicitly and frequently requires a one byte larger
instruction due to the necessary rex64 prefix.

Signed-off-by: Jan Beulich <jbeulich@...ell.com>

 include/asm-x86/pda.h |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- linux-2.6.24-rc5/include/asm-x86/pda.h	2007-12-12 16:48:43.000000000 +0100
+++ 2.6.24-rc5-x86_64-unsigned-cpu/include/asm-x86/pda.h	2007-12-07 15:32:15.000000000 +0100
@@ -15,14 +15,14 @@ struct x8664_pda {
 	unsigned long kernelstack;  /* 16 top of kernel stack for current */
 	unsigned long oldrsp; 	    /* 24 user rsp for system call */
         int irqcount;		    /* 32 Irq nesting counter. Starts with -1 */
-	int cpunumber;		    /* 36 Logical CPU number */
+	unsigned int cpunumber;	    /* 36 Logical CPU number */
 #ifdef CONFIG_CC_STACKPROTECTOR
 	unsigned long stack_canary;	/* 40 stack canary value */
 					/* gcc-ABI: this canary MUST be at
 					   offset 40!!! */
 #endif
 	char *irqstackptr;
-	int nodenumber;		    /* number of current node */
+	unsigned int nodenumber;	/* number of current node */
 	unsigned int __softirq_pending;
 	unsigned int __nmi_count;	/* number of NMI on this CPUs */
 	short mmu_state;



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