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Thinking

12-25-2005 04:32 PM

kernel: what does ____cacheline_aligned mean?

hiho@ll

i'm just reading some kernel source (drivers/char/random.c)
@row 2127

Code:

static struct keydata {

        __u32 count; /* already shifted to the final position */

        __u32 secret[12];

} ____cacheline_aligned ip_keydata[2];

ip_keydata is defined

but its never initalized
so what does ____cacheline_aligned mean?
or why is ip_keydata not initalized?

thx@ll

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