commit 
eab03ac7bd3e0da99eb9dc068772a85a5e3f3577 aka
"[PATCH] Get rid of /proc/sys/proc" was good commit except strace(1) compile
breakage it introduced:
	system.c:1581: error: 'CTL_PROC' undeclared here (not in a function)
So, add dummy enum back.
Signed-off-by: Alexey Dobriyan <adobriyan@sw.ru>
Cc: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
        CTL_KERN=1,             /* General kernel info and control */
        CTL_VM=2,               /* VM management */
        CTL_NET=3,              /* Networking */
-       /* was CTL_PROC */
+       CTL_PROC=4,             /* removal breaks strace(1) compilation */
        CTL_FS=5,               /* Filesystems */
        CTL_DEBUG=6,            /* Debugging */
        CTL_DEV=7,              /* Devices */