RE: [PATCH 2/9] x86: introduce a set of platform feature flags

[Pan, Jacob jun]

>> +#define platform_has(bit) \
>> +	test_bit(bit, (unsigned long *)platform_feature)
>
>test_bit and friends imply synchronization you probably  don't want or
>need...
>
[[JPAN]] could you explain a little more? The disassembly shows the test_bit
ends up as a testb instruction and a jump. Why there is synchronization
 involved?
Perhaps on some architectures?
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