linux-kernel - [PATCH v2] powerpc/power: Expose pfn_is

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Message-Id: <20190524104418.17194-1-malat@debian.org>
Date:   Fri, 24 May 2019 12:44:18 +0200
From:   Mathieu Malaterre <malat@...ian.org>
To:     Michael Ellerman <mpe@...erman.id.au>
Cc:     Mathieu Malaterre <malat@...ian.org>,
        Christophe Leroy <christophe.leroy@....fr>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Pavel Machek <pavel@....cz>, Len Brown <len.brown@...el.com>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        linux-s390@...r.kernel.org, linux-pm@...r.kernel.org
Subject: [PATCH v2] powerpc/power: Expose pfn_is_nosave prototype

The declaration for pfn_is_nosave is only available in
kernel/power/power.h. Since this function can be override in arch,
expose it globally. Having a prototype will make sure to avoid warning
(sometime treated as error with W=1) such as:

  arch/powerpc/kernel/suspend.c:18:5: error: no previous prototype for 'pfn_is_nosave' [-Werror=missing-prototypes]

This moves the declaration into a globally visible header file and add
missing include to avoid a warning on powerpc. Also remove the
duplicated prototypes since not required anymore.

Cc: Christophe Leroy <christophe.leroy@....fr>
Signed-off-by: Mathieu Malaterre <malat@...ian.org>
---
v2: As suggestion by christophe remove duplicates prototypes

 arch/powerpc/kernel/suspend.c | 1 +
 arch/s390/kernel/entry.h      | 1 -
 include/linux/suspend.h       | 1 +
 kernel/power/power.h          | 2 --
 4 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/kernel/suspend.c b/arch/powerpc/kernel/suspend.c
index a531154cc0f3..9e1b6b894245 100644
--- a/arch/powerpc/kernel/suspend.c
+++ b/arch/powerpc/kernel/suspend.c
@@ -8,6 +8,7 @@
  */
 
 #include <linux/mm.h>
+#include <linux/suspend.h>
 #include <asm/page.h>
 #include <asm/sections.h>
 
diff --git a/arch/s390/kernel/entry.h b/arch/s390/kernel/entry.h
index 20420c2b8a14..b2956d49b6ad 100644
--- a/arch/s390/kernel/entry.h
+++ b/arch/s390/kernel/entry.h
@@ -63,7 +63,6 @@ void __init startup_init(void);
 void die(struct pt_regs *regs, const char *str);
 int setup_profiling_timer(unsigned int multiplier);
 void __init time_init(void);
-int pfn_is_nosave(unsigned long);
 void s390_early_resume(void);
 unsigned long prepare_ftrace_return(unsigned long parent, unsigned long sp, unsigned long ip);
 
diff --git a/include/linux/suspend.h b/include/linux/suspend.h
index 6b3ea9ea6a9e..e8b8a7bede90 100644
--- a/include/linux/suspend.h
+++ b/include/linux/suspend.h
@@ -395,6 +395,7 @@ extern bool system_entering_hibernation(void);
 extern bool hibernation_available(void);
 asmlinkage int swsusp_save(void);
 extern struct pbe *restore_pblist;
+int pfn_is_nosave(unsigned long pfn);
 #else /* CONFIG_HIBERNATION */
 static inline void register_nosave_region(unsigned long b, unsigned long e) {}
 static inline void register_nosave_region_late(unsigned long b, unsigned long e) {}
diff --git a/kernel/power/power.h b/kernel/power/power.h
index 9e58bdc8a562..44bee462ff57 100644
--- a/kernel/power/power.h
+++ b/kernel/power/power.h
@@ -75,8 +75,6 @@ static inline void hibernate_reserved_size_init(void) {}
 static inline void hibernate_image_size_init(void) {}
 #endif /* !CONFIG_HIBERNATION */
 
-extern int pfn_is_nosave(unsigned long);
-
 #define power_attr(_name) \
 static struct kobj_attribute _name##_attr = {	\
 	.attr	= {				\
-- 
2.20.1