linux-kernel - [PATCH v4 2/2] x86/purgatory: Fix sparse warning, symbol not declared

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Date:   Mon, 20 Feb 2017 10:12:36 +1100
From:   "Tobin C. Harding" <me@...in.cc>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org,
        "Tobin C. Harding" <me@...in.cc>
Subject: [PATCH v4 2/2] x86/purgatory: Fix sparse warning, symbol not declared

Sparse emits warning, 'symbol not declared' for a function that has
neither file scope nor a forward declaration. The functions only call
site is an ASM file.

Add a header file with the function declaration. Include the
header file in the C source file defining the function in order
to fix the sparse warning. Include the header file in ASM file
containing the call site to document the usage.

Signed-off-by: Tobin C. Harding <me@...in.cc>
---
 arch/x86/purgatory/purgatory.c    |  1 +
 arch/x86/purgatory/purgatory.h    | 12 ++++++++++++
 arch/x86/purgatory/setup-x86_64.S |  4 ++--
 3 files changed, 15 insertions(+), 2 deletions(-)
 create mode 100644 arch/x86/purgatory/purgatory.h

diff --git a/arch/x86/purgatory/purgatory.c b/arch/x86/purgatory/purgatory.c
index 2a5f437..b6d5c89 100644
--- a/arch/x86/purgatory/purgatory.c
+++ b/arch/x86/purgatory/purgatory.c
@@ -11,6 +11,7 @@
  */
 
 #include "sha256.h"
+#include "purgatory.h"
 #include "../boot/string.h"
 
 struct sha_region {
diff --git a/arch/x86/purgatory/purgatory.h b/arch/x86/purgatory/purgatory.h
new file mode 100644
index 0000000..fb8b4f8
--- /dev/null
+++ b/arch/x86/purgatory/purgatory.h
@@ -0,0 +1,12 @@
+#ifndef PURGATORY_H
+#define PURGATORY_H
+
+#ifndef __ASSEMBLY__
+
+extern void purgatory(void);
+
+#endif	/* __ASSEMBLY__ */
+
+#endif /* PURGATORY_H */
+
+
diff --git a/arch/x86/purgatory/setup-x86_64.S b/arch/x86/purgatory/setup-x86_64.S
index fe3c91b..8045994 100644
--- a/arch/x86/purgatory/setup-x86_64.S
+++ b/arch/x86/purgatory/setup-x86_64.S
@@ -9,8 +9,8 @@
  * This source code is licensed under the GNU General Public License,
  * Version 2.  See the file COPYING for more details.
  */
-
-	.text
+#include "purgatory.h"	
+ 	.text
 	.globl purgatory_start
 	.balign 16
 purgatory_start:
-- 
2.7.4