tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
MIPS: Microoptimize arch_{read,write}_lock
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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arch/mips/include/asm/spinlock.h
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arch/mips/include/asm/spinlock.h
···
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__asm__ __volatile__(
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" .set noreorder # arch_read_lock \n"
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"1: ll %1, %2 \n"
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" bltz %1, 2f \n"
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" bltz %1, 3f \n"
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" addu %1, 1 \n"
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" sc %1, %0 \n"
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"2: sc %1, %0 \n"
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" beqz %1, 1b \n"
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" nop \n"
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" .subsection 2 \n"
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"2: ll %1, %2 \n"
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" bltz %1, 2b \n"
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"3: ll %1, %2 \n"
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" bltz %1, 3b \n"
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" addu %1, 1 \n"
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" b 1b \n"
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" b 2b \n"
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" nop \n"
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" .previous \n"
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" .set reorder \n"
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__asm__ __volatile__(
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" .set noreorder # arch_write_lock \n"
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"1: ll %1, %2 \n"
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" bnez %1, 2f \n"
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" bnez %1, 3f \n"
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" lui %1, 0x8000 \n"
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" sc %1, %0 \n"
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" beqz %1, 2f \n"
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"2: sc %1, %0 \n"
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" beqz %1, 3f \n"
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" nop \n"
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" .subsection 2 \n"
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"2: ll %1, %2 \n"
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" bnez %1, 2b \n"
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"3: ll %1, %2 \n"
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" bnez %1, 3b \n"
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" lui %1, 0x8000 \n"
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" b 1b \n"
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" b 2b \n"
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" nop \n"
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" .previous \n"
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" .set reorder \n"