kernel: various cleanups of imagereclaim(), pagereclaim(), freepages(), putimage()

imagereclaim(), pagereclaim():
- move imagereclaim() and pagereclaim() declarations to portfns.h
- consistently use ulong type for page counts
- name number of pages to free "pages" instead of "min"
- check for pages == 0 on entry

freepages():
- move pagechaindone() call to wakeup newpage() consumers inside
  palloc critical section.

putimage():
- use long type for refcount

1 files changed, 3 insertions, 1 deletions

diff --git a/sys/src/9/port/portfns.h b/sys/src/9/port/portfns.h
index 5fbcf1305..2f135c31b 100644
--- a/sys/src/9/port/portfns.h
+++ b/sys/src/9/port/portfns.h
@@ -131,6 +131,7 @@ long		ibrk(uintptr, int);
 void		ilock(Lock*);
 void		interrupted(void);
 void		iunlock(Lock*);
+ulong		imagereclaim(ulong);
 long		incref(Ref*);
 void		initseg(void);
 int		iprint(char*, ...);
@@ -204,7 +205,8 @@ Block*		padblock(Block*, int);
 void		pagechaindone(void);
 void		pagechainhead(Page*);
 void		pageinit(void);
-ulong	pagenumber(Page*);
+ulong		pagenumber(Page*);
+ulong		pagereclaim(Image*, ulong);
 void		pagersummary(void);
 void		panic(char*, ...);
 Cmdbuf*		parsecmd(char *a, int n);