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Date: Sun, 20 Apr 2003 13:03:03 -0400
From: Chuck Ebbert <76306.1226@compuserve.com>
Subject: [PATCH][2.5.68] 16-byte align x86 IRQ entry points
To: linux-kernel <linux-kernel@vger.kernel.org>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
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 How can I further test this patch?  (It boots...)

 It should be harmless; at worst it will add about 1K to an
SMP or IOAPIC kernel.

 If it works it should reduce interrupt latency.



--- a/arch/i386/kernel/entry.S
+++ b/arch/i386/kernel/entry.S
@ -382,29 +382,31 @
 ENTRY(interrupt)
 .text
 
-vector=0
+	.align 16,0x90
 ENTRY(irq_entries_start)
+vector=0
 .rept NR_IRQS
-	ALIGN
 1:	pushl $vector-256
 	jmp common_interrupt
+	.align 16,0x90
 .data
 	.long 1b
 .text
 vector=vector+1
 .endr
 
-	ALIGN
+/* aligned 16 */
 common_interrupt:
 	SAVE_ALL
 	call do_IRQ
 	jmp ret_from_intr
 
 #define BUILD_INTERRUPT(name, nr)	\
+	.align 16,0x90;			\
 ENTRY(name)				\
 	pushl $nr-256;			\
 	SAVE_ALL			\
-	call smp_/**/name;	\
+	call smp_/**/name;		\
 	jmp ret_from_intr;
 
 /* The include is where all of the SMP etc. interrupts come from */


------
 Chuck