linux-kernel - [PATCH 1/2] Introduce add_taint variant that does not print warning.

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Message-Id: <148765088309.20315.15300624012053746538.stgit@jupiter.in.ibm.com>
Date:   Tue, 21 Feb 2017 09:51:28 +0530
From:   Mahesh J Salgaonkar <mahesh@...ux.vnet.ibm.com>
To:     linuxppc-dev <linuxppc-dev@...abs.org>,
        Linux Kernel <linux-kernel@...r.kernel.org>,
        Michael Ellerman <mpe@...erman.id.au>
Subject: [PATCH 1/2] Introduce add_taint variant that does not print warning.

From: Mahesh Salgaonkar <mahesh@...ux.vnet.ibm.com>

Some interrupt handler's may not be happy to call printk and would lead to
unexpected behavior or kernel panic. e.g. machine_check_early() from MCE
handler on OPAL based system. Introduce add_taint variant that does not call
printk.

Signed-off-by: Mahesh Salgaonkar <mahesh@...ux.vnet.ibm.com>
---
 include/linux/kernel.h |    1 +
 kernel/panic.c         |    6 ++++++
 2 files changed, 7 insertions(+)

diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index cb09238..799943e 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -480,6 +480,7 @@ enum lockdep_ok {
 	LOCKDEP_NOW_UNRELIABLE
 };
 extern void add_taint(unsigned flag, enum lockdep_ok);
+extern void add_taint_no_warn(unsigned flag, enum lockdep_ok);
 extern int test_taint(unsigned flag);
 extern unsigned long get_taint(void);
 extern int root_mountflags;
diff --git a/kernel/panic.c b/kernel/panic.c
index 08aa88d..d344ea3 100644
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -392,6 +392,12 @@ void add_taint(unsigned flag, enum lockdep_ok lockdep_ok)
 }
 EXPORT_SYMBOL(add_taint);
 
+void add_taint_no_warn(unsigned flag, enum lockdep_ok lockdep_ok)
+{
+	set_bit(flag, &tainted_mask);
+}
+EXPORT_SYMBOL(add_taint_no_warn);
+
 static void spin_msec(int msecs)
 {
 	int i;