From: Dave Hansen <dave.hansen@intel•com>
To: Gerd Bayer <gbayer@linux•ibm.com>,
Richard Henderson <richard.henderson@linaro•org>,
Matt Turner <mattst88@gmail•com>,
Magnus Lindholm <linmag7@gmail•com>,
Russell King <linux@armlinux•org.uk>,
Madhavan Srinivasan <maddy@linux•ibm.com>,
Michael Ellerman <mpe@ellerman•id.au>,
Nicholas Piggin <npiggin@gmail•com>,
"Christophe Leroy (CS GROUP)" <chleroy@kernel•org>,
Bjorn Helgaas <bhelgaas@google•com>,
Thomas Gleixner <tglx@kernel•org>, Ingo Molnar <mingo@redhat•com>,
Borislav Petkov <bp@alien8•de>,
Dave Hansen <dave.hansen@linux•intel.com>,
x86@kernel•org, "H. Peter Anvin" <hpa@zytor•com>
Cc: Yinghai Lu <yinghai@kernel•org>,
linux-alpha@vger•kernel.org, linux-kernel@vger•kernel.org,
linux-arm-kernel@lists•infradead.org,
linuxppc-dev@lists•ozlabs.org, linux-pci@vger•kernel.org
Subject: Re: [PATCH 4/5] x86/pci: Use official API to iterate over PCI buses
Date: Fri, 15 May 2026 08:13:03 -0700 [thread overview]
Message-ID: <553c703f-ba9c-4785-91ba-2cf62ceb9653@intel.com> (raw)
In-Reply-To: <20260515-priv_root_buses-v1-4-f8e393c57390@linux.ibm.com>
On 5/15/26 07:22, Gerd Bayer wrote:
> static int __init pcibios_assign_resources(void)
> {
> - struct pci_bus *bus;
> + struct pci_bus *bus = NULL;
>
> if (!(pci_probe & PCI_ASSIGN_ROMS))
> - list_for_each_entry(bus, &pci_root_buses, node)
> + while ((bus = pci_find_next_bus(bus)) != NULL)
> pcibios_allocate_rom_resources(bus);
What's with the 'bus = NULL'? I thought there was some crazy macro magic
going on or something, but pci_find_next_bus() looks like a normal
function that's just taking a pointer and not _modifying_ the pointer value.
Also, wouldn't this be a more readable way of writing what you have?
while (bus = pci_find_next_bus(bus))
For that matter isn't the kernel idiom for these things:
for_each_pci_bus(bus) {
// do bus stuff
}
I'm kinda surprised there isn't one of those already.
next prev parent reply other threads:[~2026-05-15 15:13 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-05-15 14:22 [PATCH 0/5] PCI: Finally make pci_root_buses private Gerd Bayer
2026-05-15 14:22 ` [PATCH 1/5] alpha/pci: Use official API to iterate over PCI buses Gerd Bayer
2026-05-15 14:22 ` [PATCH 2/5] arm/pci: " Gerd Bayer
2026-05-18 15:45 ` Gerd Bayer
2026-05-15 14:22 ` [PATCH 3/5] powerpc/pci: " Gerd Bayer
2026-05-15 14:22 ` [PATCH 4/5] x86/pci: " Gerd Bayer
2026-05-15 15:13 ` Dave Hansen [this message]
2026-05-18 12:01 ` Gerd Bayer
2026-05-15 14:22 ` [PATCH 5/5] PCI: Make pci_root_buses private to PCI core Gerd Bayer
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