compiling drivers/char/esp.c with -Wundef triggers a warning:
In file included from drivers/char/esp.c:51:
include/linux/serialP.h:27:6: warning: "LINUX_VERSION_CODE" is not defined
The code that trips it up:
#if (LINUX_VERSION_CODE < 0x020300)
/* Unfortunate, but Linux 2.2 needs async_icount defined here and
* it got moved in 2.3 */
#include <linux/serial.h>
#endif
It's unclear if this should be fixed by adding a #include <linux/version.h>
to esp.c, or if this code should summarily be lopped out of serialP.h.
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