The lseek(2), mmap(2), truncate(2), ftruncate(2), pread(2), and

pwrite(2) syscalls are wrapped to provide compatibility with pre-7.x
kernels which required padding before the off_t parameter.  The
fcntl(2) contains compatibility code to handle kernels before the
struct flock was changed during the 8.x CURRENT development.  The
shims were reasonable to allow easier revert to the older kernel at
that time.

Now, two or three major releases later, shims do not serve any
purpose.  Such old kernels cannot handle current libc, so revert the
compatibility code.

Make padded syscalls support conditional under the COMPAT6 config
option.  For COMPAT32, the syscalls were under COMPAT6 already.

Remove WITHOUT_SYSCALL_COMPAT build option, which only purpose was to
(partially) disable the removed shims.

Reviewed by:	jhb, imp (previous versions)
Discussed with:	peter
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week

1 files changed, 2 insertions, 0 deletions

diff --git a/sys/vm/vm_mmap.c b/sys/vm/vm_mmap.c
index a9ff2482b9cd..02634d6e55f7 100644
--- a/sys/vm/vm_mmap.c
+++ b/sys/vm/vm_mmap.c
@@ -462,6 +462,7 @@ done:
 	return (error);
 }
 
+#if defined(COMPAT_FREEBSD6)
 int
 freebsd6_mmap(struct thread *td, struct freebsd6_mmap_args *uap)
 {
@@ -475,6 +476,7 @@ freebsd6_mmap(struct thread *td, struct freebsd6_mmap_args *uap)
 	oargs.pos = uap->pos;
 	return (sys_mmap(td, &oargs));
 }
+#endif
 
 #ifdef COMPAT_43
 #ifndef _SYS_SYSPROTO_H_