linux-kernel - Re: [PATCH 1/5] sched: make struct task

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Date:   Mon, 8 Feb 2021 16:25:35 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Alexey Dobriyan <adobriyan@...il.com>
Cc:     mingo@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/5] sched: make struct task_struct::state 32-bit

On Mon, Feb 08, 2021 at 05:52:45PM +0300, Alexey Dobriyan wrote:
> On Mon, Feb 08, 2021 at 05:30:25PM +0300, Alexey Dobriyan wrote:
> > On Mon, Feb 08, 2021 at 11:34:18AM +0100, Peter Zijlstra wrote:
> > > On Sat, Feb 06, 2021 at 06:18:32PM +0300, Alexey Dobriyan wrote:
> > > 
> > > > Silently delete "extern" from prototypes.
> > > 
> > > NAK, extern is right.
> > 
> > Extern is only necessary for variables.
> 
> Specifically C17, 6.2.2 p5 (linkage of identifiers):
> 
> 	if the declaration of an identifier for a function has no
> 	storage-class specifier, its linkage is determined exactly as if
> 	it were declared with the storage-class specifier "extern".
> 
> This is why nothing happens if "extern" is deleted.

I know, but I still very much like extern on the function declarations
too. It tells me the definition isn't to be found in this TU.