From: Al Viro <viro@zeniv.linux.org.uk>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: chriscli@google.com, linux-sparse@vger.kernel.org,
dan.carpenter@linaro.org, ben.dooks@codethink.co.uk,
rf@opensource.cirrus.com, Eric Zhang <zxh@xh-zhang.com>
Subject: Re: [RFC PATCH] pre-process: add __VA_OPT__ support
Date: Wed, 1 Apr 2026 21:22:30 +0100 [thread overview]
Message-ID: <20260401202230.GB2063236@ZenIV> (raw)
In-Reply-To: <20260401195251.GA974193@ZenIV>
On Wed, Apr 01, 2026 at 08:52:52PM +0100, Al Viro wrote:
> Something like delta below ought to take care of __builtin_strcmp(); figuring
> out the things like "ab"[1] being equal to 'b' is something I'd rather
> leave for later - at the very least after I resurrect and repost the
> busy-wait in shrink_dcache_parent() patchset. I've really spent way
> too much of the last couple of months on digging in sparse ;-/
BTW, gcc doesn't accept a trick allowed by clang (as well as by sparse with
this patch):
#define splat() ({ \
_Static_assert(__builtin_strcmp(__func__, "foo") == 0, \
"use only in foo()"); \
something(); \
})
gcc does not realize that __func__ is a constant array with known contents.
Oh, well...
next prev parent reply other threads:[~2026-04-01 20:18 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <cover.1771930766.git.dan.carpenter@linaro.org>
2026-02-24 11:07 ` [PATCH] sparse: add support for __VA_OPT__ Dan Carpenter
2026-02-24 11:16 ` Ben Dooks
2026-02-24 11:56 ` Dan Carpenter
2026-02-24 12:42 ` Richard Fitzgerald
2026-02-24 13:15 ` Ben Dooks
2026-02-25 2:39 ` Chris Li
2026-02-25 3:36 ` Al Viro
2026-02-25 5:29 ` [RFC PATCH] pre-process: add __VA_OPT__ support Eric Zhang
2026-02-25 6:40 ` Al Viro
2026-02-25 7:27 ` Al Viro
2026-02-25 8:14 ` Eric Zhang
2026-02-25 22:18 ` Al Viro
2026-02-26 7:29 ` Al Viro
2026-03-16 6:56 ` Al Viro
2026-03-16 7:03 ` [PATCH 01/21] split copy() into "need to copy" and "can move in place" cases Al Viro
2026-03-16 7:03 ` [PATCH 02/21] expand and simplify the call of dup_token() in copy() Al Viro
2026-03-16 7:03 ` [PATCH 03/21] more dup_token() optimizations Al Viro
2026-03-16 7:03 ` [PATCH 04/21] parsing #define: saner handling of argument count, part 1 Al Viro
2026-03-16 7:03 ` [PATCH 05/21] simplify collect_arguments() and fix error handling there Al Viro
2026-03-16 7:04 ` [PATCH 06/21] try_arg(): don't use arglist for argument name lookups Al Viro
2026-03-16 7:04 ` [PATCH 07/21] make expand_has_...() responsible for expanding its argument Al Viro
2026-03-16 7:04 ` [PATCH 08/21] preparing to change argument number encoding for TOKEN_..._ARGUMENT Al Viro
2026-03-16 7:04 ` [PATCH 09/21] steal 2 bits from argnum for argument kind Al Viro
2026-03-16 7:04 ` [PATCH 10/21] on-demand argument expansion Al Viro
2026-03-16 7:04 ` [PATCH 11/21] kill create_arglist() Al Viro
2026-03-16 7:04 ` [PATCH 12/21] stop mangling arglist, get rid of TOKEN_ARG_COUNT Al Viro
2026-03-16 7:04 ` [PATCH 13/21] deal with ## on arguments separately Al Viro
2026-03-16 7:04 ` [PATCH 14/21] preparations for __VA_OPT__ support: reshuffle argument slot assignments Al Viro
2026-03-16 7:04 ` [PATCH 15/21] pre-process.c: split try_arg() Al Viro
2026-03-16 7:04 ` [PATCH 16/21] __VA_OPT__: parsing Al Viro
2026-03-16 7:04 ` [PATCH 17/21] expansion-time va_opt handling Al Viro
2026-03-16 7:04 ` [PATCH 18/21] merge(): saner handling of ->noexpand Al Viro
2026-03-16 7:04 ` [PATCH 19/21] simplify the calling conventions of collect_arguments() Al Viro
2026-03-16 7:04 ` [PATCH 20/21] make expand_one_symbol() inline Al Viro
2026-03-16 7:04 ` [PATCH 21/21] substitute(): convert switch() into cascade of ifs Al Viro
2026-03-16 16:42 ` [RFC PATCH] pre-process: add __VA_OPT__ support Linus Torvalds
2026-03-19 3:53 ` Al Viro
2026-03-19 4:07 ` Linus Torvalds
2026-03-19 5:34 ` Al Viro
2026-03-17 7:41 ` Chris Li
2026-03-18 6:35 ` Eric Zhang
2026-03-31 8:06 ` Al Viro
2026-03-31 8:07 ` [PATCH 1/6] nextchar(): get rid of special[] Al Viro
2026-03-31 8:07 ` [PATCH 2/6] simplify the inlined side of nextchar() Al Viro
2026-03-31 8:07 ` [PATCH 3/6] tokenize_stream(): don't bother with isspace() Al Viro
2026-03-31 8:07 ` [PATCH 4/6] TOKEN_DIRECTIVE: recognize directive-introducing # in tokenizer Al Viro
2026-03-31 8:07 ` [PATCH 5/6] saner collect_arg() code generation Al Viro
2026-03-31 8:07 ` [PATCH 6/6] try to get whitespaces right Al Viro
2026-04-01 10:39 ` [RFC PATCH] pre-process: add __VA_OPT__ support Al Viro
2026-04-01 16:18 ` Linus Torvalds
2026-04-01 19:52 ` Al Viro
2026-04-01 20:22 ` Al Viro [this message]
2026-02-25 7:05 ` [PATCH] sparse: add support for __VA_OPT__ Chris Li
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20260401202230.GB2063236@ZenIV \
--to=viro@zeniv.linux.org.uk \
--cc=ben.dooks@codethink.co.uk \
--cc=chriscli@google.com \
--cc=dan.carpenter@linaro.org \
--cc=linux-sparse@vger.kernel.org \
--cc=rf@opensource.cirrus.com \
--cc=torvalds@linux-foundation.org \
--cc=zxh@xh-zhang.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox