From: Matthew Wilcox <willy@infradead.org>
To: Mina Almasry <almasrymina@google.com>
Cc: netdev@vger.kernel.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org,
Andrew Morton <akpm@linux-foundation.org>,
Simon Horman <horms@kernel.org>,
Stephen Rothwell <sfr@canb.auug.org.au>,
Jakub Kicinski <kuba@kernel.org>,
David Miller <davem@davemloft.net>,
Paolo Abeni <pabeni@redhat.com>,
Linux Next Mailing List <linux-next@vger.kernel.org>,
Arnd Bergmann <arnd@arndb.de>,
"linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>,
LEROY Christophe <christophe.leroy2@cs-soprasteria.com>
Subject: Re: [PATCH net-next v1] mm: fix build on powerpc with GCC 14
Date: Fri, 13 Sep 2024 20:22:28 +0100 [thread overview]
Message-ID: <ZuSQ9BT9Vg7O2kXv@casper.infradead.org> (raw)
In-Reply-To: <20240913192036.3289003-1-almasrymina@google.com>
On Fri, Sep 13, 2024 at 07:20:36PM +0000, Mina Almasry wrote:
> +++ b/include/linux/page-flags.h
> @@ -239,8 +239,8 @@ static inline unsigned long _compound_head(const struct page *page)
> {
> unsigned long head = READ_ONCE(page->compound_head);
>
> - if (unlikely(head & 1))
> - return head - 1;
> + if (unlikely(head & 1UL))
> + return head & ~1UL;
> return (unsigned long)page_fixed_fake_head(page);
NAK, that pessimises compound_head().
next prev parent reply other threads:[~2024-09-13 19:22 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-09-13 19:20 [PATCH net-next v1] mm: fix build on powerpc with GCC 14 Mina Almasry
2024-09-13 19:22 ` Matthew Wilcox [this message]
2024-09-14 6:50 ` Christophe Leroy
2024-09-15 10:44 ` Matthew Wilcox
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