linux-kernel - Re: [PATCH 00/20] objtool: UACCESS validation v3

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Message-ID: <20190307174322.GK32477@hirez.programming.kicks-ass.net>
Date:   Thu, 7 Mar 2019 18:43:22 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     torvalds@...ux-foundation.org, tglx@...utronix.de, hpa@...or.com,
        julien.thierry@....com, will.deacon@....com, luto@...capital.net,
        mingo@...nel.org, catalin.marinas@....com, james.morse@....com,
        valentin.schneider@....com, brgerst@...il.com, luto@...nel.org,
        bp@...en8.de, dvlasenk@...hat.com, linux-kernel@...r.kernel.org,
        dvyukov@...gle.com, rostedt@...dmis.org
Subject: Re: [PATCH 00/20] objtool: UACCESS validation v3

On Thu, Mar 07, 2019 at 10:47:05AM -0600, Josh Poimboeuf wrote:

> This "fixes" it, and also seems to help -Os make much code:
> 
> diff --git a/include/linux/compiler.h b/include/linux/compiler.h
> index 445348facea9..8de63db58fdd 100644
> --- a/include/linux/compiler.h
> +++ b/include/linux/compiler.h
> @@ -67,7 +67,7 @@ void ftrace_likely_update(struct ftrace_likely_data *f, int val,
>  				.line = __LINE__,			\
>  			};						\
>  		______r = !!(cond);					\
> -		______f.miss_hit[______r]++;					\
> +		if (______r) ______f.miss_hit[1]++; else ______f.miss_hit[0]++; \
>  		______r;						\
>  	}))
>  #endif /* CONFIG_PROFILE_ALL_BRANCHES */

Excellen; let me put the kids to bed and then I'll have a poke.