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Message-ID: <cc7ebb9b-90ac-e1ea-5057-cfcae6e772b8@c-s.fr>
Date: Wed, 20 Feb 2019 07:54:00 +0100
From: Christophe Leroy <christophe.leroy@....fr>
To: Masahiro Yamada <yamada.masahiro@...ionext.com>,
linux-kbuild@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
Michael Ellerman <mpe@...erman.id.au>
Cc: Mathieu Malaterre <malat@...ian.org>,
"Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>,
linux-kernel@...r.kernel.org, Paul Mackerras <paulus@...ba.org>
Subject: Re: [PATCH v2] powerpc/prom_init: add __init markers to all functions
Le 20/02/2019 à 06:53, Masahiro Yamada a écrit :
> 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.
__maybe_unused is really a bad trick that should be avoided, as it hides
unused functions.
Why is it a problem to keep prom_getproplen() as 'static inline' ? Most
small helpers are defined that way. Usually they are in an included
header file, but what's really the problem with having it here directly ?
Christophe
>
> Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.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 =
>
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