From: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
To: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Arnd Bergmann <arnd@arndb.de>, Kees Cook <keescook@chromium.org>,
Nick Desaulniers <ndesaulniers@google.com>,
Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 2/2] build_bug.h: remove all dummy BUILD_BUG_ON stubs for sparse
Date: Sat, 17 Nov 2018 01:31:10 +0100 [thread overview]
Message-ID: <20181117003109.jdac5rmjdmpmino7@ltop.local> (raw)
In-Reply-To: <1542349645-8852-2-git-send-email-yamada.masahiro@socionext.com>
On Fri, Nov 16, 2018 at 03:27:25PM +0900, Masahiro Yamada wrote:
> The introduction of these dummy BUILD_BUG_ON stubs dates back to
> commit 903c0c7cdc21 ("sparse: define dummy BUILD_BUG_ON definition
> for sparse"). At that time, BUILD_BUG_ON() was implemented with the
> negative array trick, which Sparse complains about even if the
> condition can be optimized and evaluated to 0 at compile-time.
OK, but from what I understand, the motivation for commit 903c0c7cdc21
was not to avoid false warnings but to avoid having twice the same
warnings: "... So it causes sparse to detect an error too. This
reduces sparse's usefulness.").
I'm not opposed to this patch (on the contrary, I think it's better
to have exactly the same code for GCC than for sparse) but I think
that your commit message need to be adjusted.
Kind regards,
-- Luc
next prev parent reply other threads:[~2018-11-17 0:31 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-16 6:27 [PATCH v2 1/2] build_bug.h: remove negative-array fallback for BUILD_BUG_ON() Masahiro Yamada
2018-11-16 6:27 ` [PATCH v2 2/2] build_bug.h: remove all dummy BUILD_BUG_ON stubs for sparse Masahiro Yamada
2018-11-16 19:01 ` Kees Cook
2018-11-17 0:31 ` Luc Van Oostenryck [this message]
2018-11-19 10:34 ` Masahiro Yamada
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