linux-kernel - Re: [PATCH] powerpc/64s: Fix possible corruption on big endian due to pgd/pud

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Message-ID: <20190219201539.GT14180@gate.crashing.org>
Date:   Tue, 19 Feb 2019 14:15:41 -0600
From:   Segher Boessenkool <segher@...nel.crashing.org>
To:     Michael Ellerman <mpe@...erman.id.au>
Cc:     Balbir Singh <bsingharora@...il.com>, erhard_f@...lbox.org,
        jack@...e.cz, linuxppc-dev@...abs.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        aneesh.kumar@...ux.vnet.ibm.com
Subject: Re: [PATCH] powerpc/64s: Fix possible corruption on big endian due to pgd/pud_present()

On Mon, Feb 18, 2019 at 11:49:18AM +1100, Michael Ellerman wrote:
> Balbir Singh <bsingharora@...il.com> writes:
> > Fair enough, my point was that the compiler can help out. I'll see what
> > -Wconversion finds on my local build :)
> 
> I get about 43MB of warnings here :)

Yes, -Wconversion complains about a lot of things that are idiomatic C.
There is a reason -Wconversion is not in -Wall or -Wextra.


Segher