From 7fcc9f7ee58ef12803a2e101ab22f12da25b4abc Mon Sep 17 00:00:00 2001
From: Edward Tomasz Napierala <trasz@FreeBSD.org>
Date: Sat, 4 Jul 2020 11:26:03 +0000
Subject: [PATCH] Add /proc/sys/kernel/tainted to linprocfs(5).  Helps LTP.

MFC after:	2 weeks
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D25556
---
 sys/compat/linprocfs/linprocfs.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/sys/compat/linprocfs/linprocfs.c b/sys/compat/linprocfs/linprocfs.c
index 4a19455b82a9..d0f5e2dd4404 100644
--- a/sys/compat/linprocfs/linprocfs.c
+++ b/sys/compat/linprocfs/linprocfs.c
@@ -1413,6 +1413,17 @@ linprocfs_dosem(PFS_FILL_ARGS)
 	return (0);
 }
 
+/*
+ * Filler function for proc/sys/kernel/tainted
+ */
+static int
+linprocfs_dotainted(PFS_FILL_ARGS)
+{
+
+	sbuf_printf(sb, "0\n");
+	return (0);
+}
+
 /*
  * Filler function for proc/sys/vm/min_free_kbytes
  *
@@ -1815,6 +1826,8 @@ linprocfs_init(PFS_INIT_ARGS)
 	    NULL, NULL, NULL, PFS_RD);
 	pfs_create_file(dir, "sem", &linprocfs_dosem,
 	    NULL, NULL, NULL, PFS_RD);
+	pfs_create_file(dir, "tainted", &linprocfs_dotainted,
+	    NULL, NULL, NULL, PFS_RD);
 
 	/* /proc/sys/kernel/random/... */
 	dir = pfs_create_dir(dir, "random", NULL, NULL, NULL, 0);