From: Matthew Wilcox <willy@infradead.org>
To: Xie Yuanbin <qq570070308@gmail.com>
Cc: rppt@kernel.org, david.laight.linux@gmail.com,
akpm@linux-foundation.org, david@kernel.org, ljs@kernel.org,
Liam.Howlett@oracle.com, vbabka@kernel.org, surenb@google.com,
mhocko@suse.com, nathan@kernel.org,
nick.desaulniers+lkml@gmail.com, morbo@google.com,
justinstitt@google.com, linux-mm@kvack.org,
linux-kernel@vger.kernel.org, llvm@lists.linux.dev
Subject: Re: [PATCH] mm: optimize the implementation of WARN_ON_ONCE_GFP()
Date: Mon, 9 Mar 2026 15:40:13 +0000 [thread overview]
Message-ID: <aa7p3eQfEuh2wObQ@casper.infradead.org> (raw)
In-Reply-To: <20260309153811.40958-1-qq570070308@gmail.com>
On Mon, Mar 09, 2026 at 11:38:11PM +0800, Xie Yuanbin wrote:
> As shown in the commit message of commit 242b872239f6a7deacbc
> ("include/linux/once_lite.h: fix judgment in WARN_ONCE with clang"),
> the code "unlikely(a && b)" may generate poor assembly code if it is
> actually "unlikely(a) && unlikely(b)" or "unlikely(a) && b".
Why fix this in multiple places in the kernel instead of once in clang?
next prev parent reply other threads:[~2026-03-09 15:40 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-09 15:38 [PATCH] mm: optimize the implementation of WARN_ON_ONCE_GFP() Xie Yuanbin
2026-03-09 15:40 ` Matthew Wilcox [this message]
2026-03-09 15:59 ` Xie Yuanbin
2026-03-10 10:55 ` Vlastimil Babka (SUSE)
2026-03-10 14:52 ` David Laight
2026-03-27 5:34 ` Andrew Morton
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