On 2020-09-29 20:06, Warner Losh wrote:
Author: imp
Date: Tue Sep 29 18:06:02 2020
New Revision: 366265
URL: https://svnweb.freebsd.org/changeset/base/366265
Log:
Standalone SX shims
Create a do-nothing version of SX locks. OpenZFS needs them. However,
since the boot loader is single threaded, they can be nops.
Modified:
head/sys/sys/sx.h
Modified: head/sys/sys/sx.h
==============================================================================
--- head/sys/sys/sx.h Tue Sep 29 17:52:15 2020 (r366264)
+++ head/sys/sys/sx.h Tue Sep 29 18:06:02 2020 (r366265)
@@ -300,4 +300,26 @@ __sx_xunlock(struct sx *sx, struct thread *td, const c
#endif /* _KERNEL */
+#ifdef _STANDALONE
+/* since we have no threads in the boot loader, trivially implement no-op
version */
+#define sx_xlock(s) (1)
+#define sx_try_xlock(s) (1)
+#define sx_xunlock(s) (1)
+#define SX_DUPOK 0
+#define SX_NEW 0
+#define SX_NOWITNESS 0
+
+static __inline void
+sx_init_flags(struct sx *sx, const char *description, int opts)
+{
+
+}
+
+static __inline void
+sx_destroy(struct sx *sx)
+{
+
+}
+#endif /* _STANDALONE */
+
#endif /* !_SYS_SX_H_ */
You may want to use:
bsd_kernel.c:sx_init_flags(struct sx *sx, const char *name, int flags)
bsd_kernel.c: sx->owned = 0;
bsd_kernel.c:sx_destroy(struct sx *sx)
bsd_kernel.c:sx_xlock(struct sx *sx)
bsd_kernel.c: sx->owned++;
bsd_kernel.c:sx_xunlock(struct sx *sx)
bsd_kernel.c: sx->owned--;
bsd_kernel.c:sx_xlocked(struct sx *sx)
bsd_kernel.c: return (sx->owned != 0);
bsd_kernel.h:struct sx {
bsd_kernel.h:#define sx_assert(...) do { } while (0)
bsd_kernel.h:#define sx_init(...) sx_init_flags(__VA_ARGS__, 0)
bsd_kernel.h:void sx_init_flags(struct sx *, const char *, int);
bsd_kernel.h:void sx_destroy(struct sx *);
bsd_kernel.h:void sx_xlock(struct sx *);
bsd_kernel.h:void sx_xunlock(struct sx *);
bsd_kernel.h:int sx_xlocked(struct sx *);
from "src/stand/kshim"
--HPS
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