Author: jhb
Date: Fri Dec  6 19:20:45 2019
New Revision: 355459
URL: https://svnweb.freebsd.org/changeset/base/355459

Log:
  Remove SPARE_USRSPACE.
  
  This constant was used to reserve space at the top of the stack to
  hold translated system call arguments for non-default ABIs (the
  "stackgap").  However, none of the compatibility ABIs have used the
  stackgap in many years and the last use of SPARE_USRSPACE was removed
  in r355373.
  
  Reviewed by:  kib
  Sponsored by: DARPA
  Differential Revision:        https://reviews.freebsd.org/D22697

Modified:
  head/sys/sys/exec.h

Modified: head/sys/sys/exec.h
==============================================================================
--- head/sys/sys/exec.h Fri Dec  6 18:51:16 2019        (r355458)
+++ head/sys/sys/exec.h Fri Dec  6 19:20:45 2019        (r355459)
@@ -77,7 +77,6 @@ struct execsw {
  * Prefer the kern.ps_strings or kern.proc.ps_strings sysctls to this constant.
  */
 #define        PS_STRINGS      (USRSTACK - sizeof(struct ps_strings))
-#define        SPARE_USRSPACE  4096
 
 int exec_map_first_page(struct image_params *);        
 void exec_unmap_first_page(struct image_params *);       
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