On Sep 28, 2007, at 03:31:11, Geert Uytterhoeven wrote:
Can't you store the loglevel in the kprint_block and check it in
all successive kprint_*() macros? If gcc knows it's constant, it
can optimize the non-wanted code away. As other fields in struct
kprint_block cannot be constant (they store internal state), you
have to split it like:
struct kprint_block {
int loglevel;
struct real_kprint_block real; /* internal state */
}
and pass &block.real() instead of &block to all successive internal
functions. I haven't tried this, so let's hope gcc is actually
smart enough...
Well actually, I believe you could just do:
struct kprint_block {
const int loglevel;
[...];
};
Then cast away the constness to actually set it initially:
*((int *)&block.loglevel) = LOGLEVEL;
Cheers,
Kyle Moffett
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