linux-kernel - Re: [PATCH v7 07/10] kernel/jump_label: abstract jump

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Message-ID: <20180105175834.vqgpsme7itsdg54u@armageddon.cambridge.arm.com>
Date:   Fri, 5 Jan 2018 17:58:34 +0000
From:   Catalin Marinas <catalin.marinas@....com>
To:     Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc:     linux-kernel@...r.kernel.org, linux-mips@...ux-mips.org,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Will Deacon <will.deacon@....com>,
        Paul Mackerras <paulus@...ba.org>,
        "H. Peter Anvin" <hpa@...or.com>, sparclinux@...r.kernel.org,
        linux-s390@...r.kernel.org, Nicolas Pitre <nico@...aro.org>,
        Michael Ellerman <mpe@...erman.id.au>, x86@...nel.org,
        Russell King <linux@...linux.org.uk>,
        Ingo Molnar <mingo@...hat.com>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        Petr Mladek <pmladek@...e.com>,
        Kees Cook <keescook@...omium.org>,
        Arnd Bergmann <arnd@...db.de>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        James Morris <james.l.morris@...cle.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-arm-kernel@...ts.infradead.org,
        linuxppc-dev@...ts.ozlabs.org, Ralf Baechle <ralf@...ux-mips.org>,
        Thomas Garnier <thgarnie@...gle.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Jessica Yu <jeyu@...nel.org>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH v7 07/10] kernel/jump_label: abstract jump_entry member
 accessors

On Tue, Jan 02, 2018 at 08:05:46PM +0000, Ard Biesheuvel wrote:
> diff --git a/arch/arm/include/asm/jump_label.h b/arch/arm/include/asm/jump_label.h
> index e12d7d096fc0..7b05b404063a 100644
> --- a/arch/arm/include/asm/jump_label.h
> +++ b/arch/arm/include/asm/jump_label.h
> @@ -45,5 +45,32 @@ struct jump_entry {
>  	jump_label_t key;
>  };
>  
> +static inline jump_label_t jump_entry_code(const struct jump_entry *entry)
> +{
> +	return entry->code;
> +}
> +
> +static inline struct static_key *jump_entry_key(const struct jump_entry *entry)
> +{
> +	return (struct static_key *)((unsigned long)entry->key & ~1UL);
> +}
> +
> +static inline bool jump_entry_is_branch(const struct jump_entry *entry)
> +{
> +	return (unsigned long)entry->key & 1UL;
> +}
> +
> +static inline bool jump_entry_is_module_init(const struct jump_entry *entry)
> +{
> +	return entry->code == 0;
> +}
> +
> +static inline void jump_entry_set_module_init(struct jump_entry *entry)
> +{
> +	entry->code = 0;
> +}
> +
> +#define jump_label_swap		NULL

Is there any difference between these functions on any of the
architectures touched? Even with the relative offset, arm64 and x86
looked the same to me (well, I may have missed some detail).

-- 
Catalin