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
Subject: Re: [PATCH v2] PCI: Batch BAR sizing operations
Date: Mon, 10 Feb 2025 21:08:19 +0100 [thread overview]
Message-ID: <20250210200819.GL32480@redhat.com> (raw)
In-Reply-To: <20250210195658.GK32480@redhat.com>
On 02/10, Oleg Nesterov wrote:
>
> On 02/10, Alex Williamson wrote:
> >
> > --- a/drivers/pci/probe.c
> > +++ b/drivers/pci/probe.c
> > @@ -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);
> > + if (__builtin_constant_p(howmany))
> > + BUILD_BUG_ON(howmany > PCI_STD_NUM_BARS);
>
> Or just
>
> BUILD_BUG_ON(__builtin_constant_p(howmany) && howmany > PCI_STD_NUM_BARS);
>
> I dunno... Works for me in any case.
>
> I don't know if this is "right" solution though,
I mean, atm I simply don't know if with the newer compiler
__builtin_constant_p(howmany) will be true in this case.
Oleg.
next prev parent reply other threads:[~2025-02-10 20:08 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-01-20 18:21 [PATCH v2] PCI: Batch BAR sizing operations Alex Williamson
2025-01-20 22:44 ` Bjorn Helgaas
2025-01-21 19:01 ` Mitchell Augustin
2025-01-23 12:15 ` Ilpo Järvinen
2025-02-09 15:45 ` Oleg Nesterov
2025-02-10 16:36 ` Alex Williamson
2025-02-10 19:56 ` Oleg Nesterov
2025-02-10 20:08 ` Oleg Nesterov [this message]
2025-02-10 20:48 ` Alex Williamson
2025-02-10 22:11 ` David Laight
2025-02-10 22:46 ` Oleg Nesterov
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