linux-hardening - Re: [PATCH 001/141] afs: Fix fall-through warnings for Clang

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Date:   Tue, 24 Nov 2020 13:21:30 +0000
From:   David Howells <dhowells@...hat.com>
To:     Joe Perches <joe@...ches.com>
Cc:     dhowells@...hat.com, "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        linux-afs@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH 001/141] afs: Fix fall-through warnings for Clang

Joe Perches <joe@...ches.com> wrote:

> > My preference would be to fall through.  The case number is the state machine
> > state, as indexed by call->unmarshall.
> 
> Then ideally the state machine states should be enums and not numbers
> and the compiler should use a default block for unhandled states right?
> 
> Is code like call->marshall++ a common style for kernel state machines?
> Perhaps not.

How the value is interpreted is unique to each delivery function, of which
there are a number, since it counts out the separate parts of the xdr encoding
for that particular RPC request or reply block.

Maybe "state machine" isn't the right term.

David