On Fri, 2007-02-09 at 01:35 -0800, Andrew Morton wrote:
> On Fri, 09 Feb 2007 20:20:27 +1100 Rusty Russell <[email protected]> wrote:
>
> > +#define log(...) \
> > + do { \
> > + mm_segment_t oldfs = get_fs(); \
> > + char buf[100]; \
> > + sprintf(buf, "lguest:" __VA_ARGS__); \
> > + set_fs(KERNEL_DS); \
> > + sys_write(1, buf, strlen(buf)); \
> > + set_fs(oldfs); \
> > + } while(0)
>
> Due to gcc shortcomings, each instance of this will chew an additional 100
> bytes of stack. Unless they fixed it recently. Is a bit of a timebomb. I
> guess ksaprintf() could be used.
>
> It also looks a bit, umm, innovative.
It's also unused 8)
It's an extremely useful macro for doing grossly invasive logging of the
guest. I'll drop it if you prefer.
Cheers,
Rusty.
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