From 6c2a934b79c22feb4f143e2ebab6772d399b10a1 Mon Sep 17 00:00:00 2001
From: Dmitry Chagin <dchagin@FreeBSD.org>
Date: Sat, 25 Mar 2017 15:47:29 +0000
Subject: [PATCH] Implement Linux mincore() system call. This is necessary for
 the upcoming drm-next.

Suggested by:	hselasky@
MFC after:	1 month
---
 sys/amd64/linux/linux_dummy.c     |  1 -
 sys/amd64/linux32/linux32_dummy.c |  1 -
 sys/compat/linux/linux_misc.c     | 14 ++++++++++++++
 sys/i386/linux/linux_dummy.c      |  1 -
 4 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/sys/amd64/linux/linux_dummy.c b/sys/amd64/linux/linux_dummy.c
index 0a34dc121f1d..96f055958627 100644
--- a/sys/amd64/linux/linux_dummy.c
+++ b/sys/amd64/linux/linux_dummy.c
@@ -59,7 +59,6 @@ UNIMPLEMENTED(tuxcall);
 UNIMPLEMENTED(uselib);
 UNIMPLEMENTED(vserver);
 
-DUMMY(mincore);
 DUMMY(sendfile);
 DUMMY(syslog);
 DUMMY(setfsuid);
diff --git a/sys/amd64/linux32/linux32_dummy.c b/sys/amd64/linux32/linux32_dummy.c
index 2c8d6b579e41..d0f04b183adc 100644
--- a/sys/amd64/linux32/linux32_dummy.c
+++ b/sys/amd64/linux32/linux32_dummy.c
@@ -79,7 +79,6 @@ DUMMY(sendfile);
 DUMMY(setfsuid);
 DUMMY(setfsgid);
 DUMMY(pivot_root);
-DUMMY(mincore);
 DUMMY(ptrace);
 DUMMY(lookup_dcookie);
 DUMMY(remap_file_pages);
diff --git a/sys/compat/linux/linux_misc.c b/sys/compat/linux/linux_misc.c
index 2ce3be2b50e8..a660928795b4 100644
--- a/sys/compat/linux/linux_misc.c
+++ b/sys/compat/linux/linux_misc.c
@@ -2534,3 +2534,17 @@ linux_getrandom(struct thread *td, struct linux_getrandom_args *args)
 
 	return (read_random_uio(&uio, args->flags & LINUX_GRND_NONBLOCK));
 }
+
+int
+linux_mincore(struct thread *td, struct linux_mincore_args *args)
+{
+	struct mincore_args bsd_args;
+
+	/* Needs to be page-aligned */
+	if (args->start & PAGE_MASK)
+		return (EINVAL);
+	bsd_args.addr = PTRIN(args->start);
+	bsd_args.len = args->len;
+	bsd_args.vec = args->vec;
+	return (sys_mincore(td, &bsd_args));
+}
diff --git a/sys/i386/linux/linux_dummy.c b/sys/i386/linux/linux_dummy.c
index c025cecfc42f..1867cfebdd2c 100644
--- a/sys/i386/linux/linux_dummy.c
+++ b/sys/i386/linux/linux_dummy.c
@@ -82,7 +82,6 @@ DUMMY(sendfile);		/* different semantics */
 DUMMY(setfsuid);
 DUMMY(setfsgid);
 DUMMY(pivot_root);
-DUMMY(mincore);
 DUMMY(lookup_dcookie);
 DUMMY(remap_file_pages);
 DUMMY(mbind);