Rusty Russell wrote:
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.
Yes, it is a bit, umm, innovative. If it is going to be kept, even if
just for devel logging, you should disable interrupts around it.
Changing segments is not a normal thing to do.
Zach
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