linux-kernel - Re: [PATCH] block: convert tasklets to use new tasklet

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Date:   Wed, 19 Aug 2020 14:39:32 -0700
From:   James Bottomley <James.Bottomley@...senPartnership.com>
To:     Allen <allen.lkml@...il.com>
Cc:     Jens Axboe <axboe@...nel.dk>, Kees Cook <keescook@...omium.org>,
        Allen Pais <allen.cryptic@...il.com>, jdike@...toit.com,
        richard@....at, anton.ivanov@...bridgegreys.com, 3chas3@...il.com,
        stefanr@...6.in-berlin.de, airlied@...ux.ie,
        Daniel Vetter <daniel@...ll.ch>, sre@...nel.org,
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        jassisinghbrar@...il.com, shawnguo@...nel.org,
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        broonie@...nel.org, martyn@...chs.me.uk, manohar.vanga@...il.com,
        mitch@...oth.com, David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, linux-um@...ts.infradead.org,
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        Romain Perier <romain.perier@...il.com>
Subject: Re: [PATCH] block: convert tasklets to use new tasklet_setup() API

On Wed, 2020-08-19 at 21:54 +0530, Allen wrote:
> > [...]
> > > > Since both threads seem to have petered out, let me suggest in
> > > > kernel.h:
> > > > 
> > > > #define cast_out(ptr, container, member) \
> > > >     container_of(ptr, typeof(*container), member)
> > > > 
> > > > It does what you want, the argument order is the same as
> > > > container_of with the only difference being you name the
> > > > containing structure instead of having to specify its type.
> > > 
> > > Not to incessantly bike shed on the naming, but I don't like
> > > cast_out, it's not very descriptive. And it has connotations of
> > > getting rid of something, which isn't really true.
> > 
> > Um, I thought it was exactly descriptive: you're casting to the
> > outer container.  I thought about following the C++ dynamic casting
> > style, so out_cast(), but that seemed a bit pejorative.  What about
> > outer_cast()?
> > 
> > > FWIW, I like the from_ part of the original naming, as it has
> > > some clues as to what is being done here. Why not just
> > > from_container()? That should immediately tell people what it
> > > does without having to look up the implementation, even before
> > > this becomes a part of the accepted coding norm.
> > 
> > I'm not opposed to container_from() but it seems a little less
> > descriptive than outer_cast() but I don't really care.  I always
> > have to look up container_of() when I'm using it so this would just
> > be another macro of that type ...
> > 
> 
>  So far we have a few which have been suggested as replacement
> for from_tasklet()
> 
> - out_cast() or outer_cast()
> - from_member().
> - container_from() or from_container()
> 
> from_container() sounds fine, would trimming it a bit work? like
> from_cont().

I'm fine with container_from().  It's the same form as container_of()
and I think we need urgent agreement to not stall everything else so
the most innocuous name is likely to get the widest acceptance.

James