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Date: Wed, 26 Aug 2020 12:55:28 +0300 From: Dan Carpenter <dan.carpenter@...cle.com> To: Allen Pais <allen.cryptic@...il.com> Cc: James Bottomley <James.Bottomley@...senpartnership.com>, Ulf Hansson <ulf.hansson@...aro.org>, linux-atm-general@...ts.sourceforge.net, manohar.vanga@...il.com, airlied@...ux.ie, linux-hyperv@...r.kernel.org, dri-devel@...ts.freedesktop.org, sre@...nel.org, anton.ivanov@...bridgegreys.com, devel@...verdev.osuosl.org, linux-s390@...r.kernel.org, linux1394-devel@...ts.sourceforge.net, maximlevitsky@...il.com, richard@....at, deller@....de, jassisinghbrar@...il.com, linux-spi@...r.kernel.org, 3chas3@...il.com, intel-gfx@...ts.freedesktop.org, Jakub Kicinski <kuba@...nel.org>, mporter@...nel.crashing.org, jdike@...toit.com, Kees Cook <keescook@...omium.org>, oakad@...oo.com, s.hauer@...gutronix.de, linux-input@...r.kernel.org, linux-um@...ts.infradead.org, linux-block@...r.kernel.org, broonie@...nel.org, openipmi-developer@...ts.sourceforge.net, mitch@...oth.com, linux-arm-kernel@...ts.infradead.org, Jens Axboe <axboe@...nel.dk>, linux-parisc@...r.kernel.org, netdev@...r.kernel.org, martyn@...chs.me.uk, dmitry.torokhov@...il.com, linux-mmc@...r.kernel.org, Allen <allen.lkml@...il.com>, linux-kernel@...r.kernel.org, alex.bou9@...il.com, stefanr@...6.in-berlin.de, Daniel Vetter <daniel@...ll.ch>, linux-ntb@...glegroups.com, Romain Perier <romain.perier@...il.com>, shawnguo@...nel.org, David Miller <davem@...emloft.net> Subject: Re: [PATCH] block: convert tasklets to use new tasklet_setup() API On Wed, Aug 26, 2020 at 07:21:35AM +0530, Allen Pais wrote: > On Thu, Aug 20, 2020 at 3:09 AM James Bottomley > <James.Bottomley@...senpartnership.com> wrote: > > > > 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. > > Kees, > > Will you be sending the newly proposed API to Linus? I have V2 > which uses container_from() > ready to be sent out. I liked that James swapped the first two arguments so that it matches container_of(). Plus it's nice that when you have: struct whatever *foo = container_from(ptr, foo, member); Then it means that "ptr == &foo->member". regards, dan carpenter
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