linux-kernel - Re: [PATCH] powerpc/prom_init: add _

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Date:   Tue, 05 Feb 2019 21:28:16 +1100
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>,
        linuxppc-dev@...ts.ozlabs.org
Cc:     Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        linux-kernel@...r.kernel.org, Paul Mackerras <paulus@...ba.org>,
        Mathieu Malaterre <malat@...ian.org>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>
Subject: Re: [PATCH] powerpc/prom_init: add __init markers to all functions

Masahiro Yamada <yamada.masahiro@...ionext.com> writes:

> 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'm going to drop that part because it breaks the build in some
configurations (as reported by the build robot).

> diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c
> index f33ff41..85b0719 100644
> --- a/arch/powerpc/kernel/prom_init.c
> +++ b/arch/powerpc/kernel/prom_init.c
> @@ -501,19 +501,19 @@ 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 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 +523,7 @@ 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 +570,7 @@ 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 +595,7 @@ 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 +2924,7 @@ 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 inline void __init fixup_device_tree_pasemi(void) { }

I don't think we need __init for an empty static inline.

>  #endif
>  
>  static void __init fixup_device_tree(void)
> @@ -2986,15 +2986,15 @@ 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)
>  {
>  }

Those should be empty static inlines, I'll fix them up.

>  #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 +3008,7 @@ 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 +3019,7 @@ 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 =


cheers