Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
[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: Ralf Baechle <ralf@linux-mips.org>
+12
-10
include/asm-mips/delay.h
+12
-10
include/asm-mips/delay.h
···
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{
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if (sizeof(long) == 4)
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__asm__ __volatile__ (
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-
".set\tnoreorder\n"
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-
"1:\tbnez\t%0,1b\n\t"
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-
"subu\t%0,1\n\t"
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-
".set\treorder"
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+
" .set noreorder \n"
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+
" .align 3 \n"
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"1: bnez %0, 1b \n"
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+
" subu %0, 1 \n"
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+
" .set reorder \n"
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: "=r" (loops)
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: "0" (loops));
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else if (sizeof(long) == 8)
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__asm__ __volatile__ (
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-
".set\tnoreorder\n"
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-
"1:\tbnez\t%0,1b\n\t"
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"dsubu\t%0,1\n\t"
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-
".set\treorder"
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-
:"=r" (loops)
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-
:"0" (loops));
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+
" .set noreorder \n"
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+
" .align 3 \n"
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+
"1: bnez %0, 1b \n"
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+
" dsubu %0, 1 \n"
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+
" .set reorder \n"
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+
: "=r" (loops)
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+
: "0" (loops));
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}
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