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From:   Masahiro Yamada <yamada.masahiro@socionext.com>
To:     linux-kbuild@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
        Michael Ellerman <mpe@ellerman.id.au>
Cc:     Masahiro Yamada <yamada.masahiro@socionext.com>,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        linux-kernel@vger.kernel.org, Paul Mackerras <paulus@samba.org>,
        Mathieu Malaterre <malat@debian.org>,
        "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
Subject: [PATCH v2] powerpc/prom_init: add __init markers to all functions
Date:   Wed, 20 Feb 2019 14:53:16 +0900
Message-Id: <1550641996-21937-1-git-send-email-yamada.masahiro@socionext.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

It is fragile to rely on the compiler's optimization to avoid the
section mismatch. Some functions may not be necessarily inlined
when the compiler's inlining heuristic changes.

Add __init markers consistently.

As for prom_getprop() and prom_getproplen(), they are marked as
'inline', so inlining is guaranteed because PowerPC never enables
CONFIG_OPTIMIZE_INLINING. However, it would be better to leave the
inlining decision to the compiler. I replaced 'inline' with __init.
I added __maybe_unused to prom_getproplen() because it is currently
relying on the side-effect of 'inline'; GCC does not report
-Wunused-function warnings for functions with 'inline' marker.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
---

Changes in v2:
  - Add __maybe_unsed to prom_getproplen()
  - Add __init to enter_prom() as well

 arch/powerpc/kernel/prom_init.c | 29 +++++++++++++++--------------
 1 file changed, 15 insertions(+), 14 deletions(-)

diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c
index f33ff41..1bad0ac 100644
--- a/arch/powerpc/kernel/prom_init.c
+++ b/arch/powerpc/kernel/prom_init.c
@@ -138,9 +138,9 @@ extern void __start(unsigned long r3, unsigned long r4, unsigned long r5,
 		    unsigned long r9);
 
 #ifdef CONFIG_PPC64
-extern int enter_prom(struct prom_args *args, unsigned long entry);
+extern int __init enter_prom(struct prom_args *args, unsigned long entry);
 #else
-static inline int enter_prom(struct prom_args *args, unsigned long entry)
+static int __init enter_prom(struct prom_args *args, unsigned long entry)
 {
 	return ((int (*)(struct prom_args *))entry)(args);
 }
@@ -501,19 +501,20 @@ static int __init prom_next_node(phandle *nodep)
 	}
 }
 
-static inline int prom_getprop(phandle node, const char *pname,
+static int __init prom_getprop(phandle node, const char *pname,
 			       void *value, size_t valuelen)
 {
 	return call_prom("getprop", 4, 1, node, ADDR(pname),
 			 (u32)(unsigned long) value, (u32) valuelen);
 }
 
-static inline int prom_getproplen(phandle node, const char *pname)
+static int __init __maybe_unused prom_getproplen(phandle node,
+						 const char *pname)
 {
 	return call_prom("getproplen", 2, 1, node, ADDR(pname));
 }
 
-static void add_string(char **str, const char *q)
+static void __init add_string(char **str, const char *q)
 {
 	char *p = *str;
 
@@ -523,7 +524,7 @@ static void add_string(char **str, const char *q)
 	*str = p;
 }
 
-static char *tohex(unsigned int x)
+static char __init *tohex(unsigned int x)
 {
 	static const char digits[] __initconst = "0123456789abcdef";
 	static char result[9] __prombss;
@@ -570,7 +571,7 @@ static int __init prom_setprop(phandle node, const char *nodename,
 #define islower(c)	('a' <= (c) && (c) <= 'z')
 #define toupper(c)	(islower(c) ? ((c) - 'a' + 'A') : (c))
 
-static unsigned long prom_strtoul(const char *cp, const char **endp)
+static unsigned long __init prom_strtoul(const char *cp, const char **endp)
 {
 	unsigned long result = 0, base = 10, value;
 
@@ -595,7 +596,7 @@ static unsigned long prom_strtoul(const char *cp, const char **endp)
 	return result;
 }
 
-static unsigned long prom_memparse(const char *ptr, const char **retptr)
+static unsigned long __init prom_memparse(const char *ptr, const char **retptr)
 {
 	unsigned long ret = prom_strtoul(ptr, retptr);
 	int shift = 0;
@@ -2924,7 +2925,7 @@ static void __init fixup_device_tree_pasemi(void)
 	prom_setprop(iob, name, "device_type", "isa", sizeof("isa"));
 }
 #else	/* !CONFIG_PPC_PASEMI_NEMO */
-static inline void fixup_device_tree_pasemi(void) { }
+static void __init fixup_device_tree_pasemi(void) { }
 #endif
 
 static void __init fixup_device_tree(void)
@@ -2986,15 +2987,15 @@ static void __init prom_check_initrd(unsigned long r3, unsigned long r4)
 
 #ifdef CONFIG_PPC64
 #ifdef CONFIG_RELOCATABLE
-static void reloc_toc(void)
+static void __init reloc_toc(void)
 {
 }
 
-static void unreloc_toc(void)
+static void __init unreloc_toc(void)
 {
 }
 #else
-static void __reloc_toc(unsigned long offset, unsigned long nr_entries)
+static void __init __reloc_toc(unsigned long offset, unsigned long nr_entries)
 {
 	unsigned long i;
 	unsigned long *toc_entry;
@@ -3008,7 +3009,7 @@ static void __reloc_toc(unsigned long offset, unsigned long nr_entries)
 	}
 }
 
-static void reloc_toc(void)
+static void __init reloc_toc(void)
 {
 	unsigned long offset = reloc_offset();
 	unsigned long nr_entries =
@@ -3019,7 +3020,7 @@ static void reloc_toc(void)
 	mb();
 }
 
-static void unreloc_toc(void)
+static void __init unreloc_toc(void)
 {
 	unsigned long offset = reloc_offset();
 	unsigned long nr_entries =
-- 
2.7.4