4477 DTrace should speak JSON
Reviewed by: Bryan Cantrill <bmc@joyent.com>

*** 36,45 ****
--- 36,49 ----
  
  /*
   * This header file contains a collection of macros that the strtou?ll?
   * functions in common/util use to test characters.  What we need is a kernel
   * version of ctype.h.
+  *
+  * NOTE: These macros are used within several DTrace probe context functions.
+  * They must not be altered to make function calls or perform actions not
+  * safe in probe context.
   */
  
  #if     defined(_KERNEL) && !defined(_BOOT)
  
  #define isalnum(ch)     (isalpha(ch) || isdigit(ch))