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Commit 5ee82350 authored by Ralf Baechle's avatar Ralf Baechle
Browse files

[MIPS] Fix instable BogoMIPS on multi-issue processors. 



Increase alignment of BogoMIPS loop to 8 bytes.  Having the delay loop
overlap cache line boundaries may cause instable delays.
    
Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent f3bf07b9

include/asm-mips/delay.h

+12 −10
Original line number Diff line number Diff line
@@ -19,18 +19,20 @@ static inline void __delay(unsigned long loops) 
{

	if (sizeof(long) == 4)

		__asm__ __volatile__ (

		".set\tnoreorder\n"

		"1:\tbnez\t%0,1b\n\t"

		"subu\t%0,1\n\t"

		".set\treorder"

		"	.set	noreorder				\n"

		"	.align	3					\n"

		"1:	bnez	%0, 1b					\n"

		"	subu	%0, 1					\n"

		"	.set	reorder					\n"

		: "=r" (loops)

		: "0" (loops));

	else if (sizeof(long) == 8)

		__asm__ __volatile__ (

		".set\tnoreorder\n"

		"1:\tbnez\t%0,1b\n\t"

		"dsubu\t%0,1\n\t"

		".set\treorder"

		"	.set	noreorder				\n"

		"	.align	3					\n"

		"1:	bnez	%0, 1b					\n"

		"	dsubu	%0, 1					\n"

		"	.set	reorder					\n"

		: "=r" (loops)

		: "0" (loops));

}