linux-kernel - Re: [PATCH] arch-powerpc: Return false instead of -EFAULT

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Message-ID: <1442483254.26748.5.camel@ellerman.id.au>
Date:	Thu, 17 Sep 2015 19:47:34 +1000
From:	Michael Ellerman <mpe@...erman.id.au>
To:	Peter Senna Tschudin <peter.senna@...il.com>
Cc:	benh@...nel.crashing.org, paulus@...ba.org, anton@...ba.org,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arch-powerpc: Return false instead of -EFAULT

On Thu, 2015-09-17 at 11:18 +0200, Peter Senna Tschudin wrote:
> Returning a negative value for a boolean function seem to have the
> undesired effect of returning true. Replace -EINVAL by false in a
> bool-returning function.
> 
> The diff of the .s file before and after the change (using cross
> compilation) starts with:
> 
> 440,441c440,441
> < .L43:
> < 	li 3,1	 # D.25775,
> ---
> > .L42:
> > 	li 3,0	 # D.25775,
> ...
> 
> while if -EFAULT is replaced by true, the diff is empty.

Ah, that's rather unfortunate.

Can you post the full asm listing, for all three cases?

cheers


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