linux-kernel - Re: [PATCH 09/24] jump_label: Add branch hints to static_branch

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Date:   Wed, 24 Jan 2018 19:46:12 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     David Woodhouse <dwmw2@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        linux-kernel@...r.kernel.org, Dave Hansen <dave.hansen@...el.com>,
        Ashok Raj <ashok.raj@...el.com>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Arjan Van De Ven <arjan.van.de.ven@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Jun Nakajima <jun.nakajima@...el.com>,
        Asit Mallick <asit.k.mallick@...el.com>,
        Jason Baron <jbaron@...mai.com>
Subject: Re: [PATCH 09/24] jump_label: Add branch hints to
 static_branch_{un,}likely()

On Tue, Jan 23, 2018 at 04:25:48PM +0100, Peter Zijlstra wrote:
> For some reason these were missing, I've not observed this patch
> making a difference in the few code locations I checked, but this
> makes sense.
> 
> Cc: Jason Baron <jbaron@...mai.com>
> Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> ---
>  include/linux/jump_label.h |    4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> --- a/include/linux/jump_label.h
> +++ b/include/linux/jump_label.h
> @@ -388,7 +388,7 @@ extern bool ____wrong_branch_error(void)
>  		branch = !arch_static_branch_jump(&(x)->key, true);		\
>  	else									\
>  		branch = ____wrong_branch_error();				\
> -	branch;									\
> +	likely(branch);								\
>  })
>  
>  #define static_branch_unlikely(x)						\
> @@ -400,7 +400,7 @@ extern bool ____wrong_branch_error(void)
>  		branch = arch_static_branch(&(x)->key, false);			\
>  	else									\
>  		branch = ____wrong_branch_error();				\
> -	branch;									\
> +	unlikely(branch);							\
>  })

LOL, it is practically in the name already. :-)

Reviewed-by: Borislav Petkov <bp@...e.de>

-- 
Regards/Gruss,
    Boris.

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