From: Oleg Nesterov <oleg@redhat.com>
To: Alex Williamson <alex.williamson@redhat.com>
Cc: bhelgaas@google.com, linux-pci@vger.kernel.org,
linux-kernel@vger.kernel.org, mitchell.augustin@canonical.com,
ilpo.jarvinen@linux.intel.com,
David Laight <david.laight.linux@gmail.com>
Subject: Re: [PATCH] PCI: Fix BUILD_BUG_ON usage for old gcc
Date: Tue, 11 Feb 2025 11:05:03 +0100 [thread overview]
Message-ID: <20250211100502.GA9174@redhat.com> (raw)
In-Reply-To: <20250210220010.GM32480@redhat.com>
On 02/10, Oleg Nesterov wrote:
>
> On 02/10, Alex Williamson wrote:
> >
> > @@ -345,7 +345,8 @@ static void pci_read_bases(struct pci_dev *dev, unsigned int howmany, int rom)
> > unsigned int pos, reg;
> > u16 orig_cmd;
> >
> > - BUILD_BUG_ON(howmany > PCI_STD_NUM_BARS);
> > + BUILD_BUG_ON(__builtin_constant_p(howmany) &&
> > + howmany > PCI_STD_NUM_BARS);
>
> Thanks!
>
> Tested-by: Oleg Nesterov <oleg@redhat.com>
Just in case... I agree with David, statically_true() looks a bit
better and
BUILD_BUG_ON(statically_true(howmany > PCI_STD_NUM_BARS));
also works for me, so if you decide to update this patch feel free
to keep my Tested-by.
Oleg.
next prev parent reply other threads:[~2025-02-11 10:05 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-02-10 21:01 [PATCH] PCI: Fix BUILD_BUG_ON usage for old gcc Alex Williamson
2025-02-10 22:00 ` Oleg Nesterov
2025-02-11 10:05 ` Oleg Nesterov [this message]
2025-02-11 22:38 ` Mitchell Augustin
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