linux-kernel - [PATCH v2 4/6] PCI: Allow architecture-specific pci_remap

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Date:   Sat, 25 Sep 2021 10:46:39 +0200
From:   Sergio Paracuellos <sergio.paracuellos@...il.com>
To:     tsbogend@...ha.franken.de
Cc:     robh@...nel.org, arnd@...db.de, catalin.marinas@....com,
        Liviu.Dudau@....com, bhelgaas@...gle.com, matthias.bgg@...il.com,
        gregkh@...uxfoundation.org, linux-mips@...r.kernel.org,
        linux-pci@...r.kernel.org, linux-staging@...ts.linux.dev,
        neil@...wn.name, linux-kernel@...r.kernel.org
Subject: [PATCH v2 4/6] PCI: Allow architecture-specific pci_remap_iospace()

pci_remap_iospace() was originally meant as an architecture specific helper
but it moved into generic code after all architectures had the same
requirements. MIPS has different requirements so it should not be shared.

The way for doing this will be using a macro 'pci_remap_iospace' defined
for those architectures that need a special treatment. Hence, put core API
function inside preprocesor conditional code for 'pci_remap_iospace'
definition.

Acked-by: Bjorn Helgaas <bhelgaas@...gle.com>
Signed-off-by: Sergio Paracuellos <sergio.paracuellos@...il.com>
---
 drivers/pci/pci.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index ce2ab62b64cf..0ec57bb01a88 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -4123,6 +4123,7 @@ unsigned long __weak pci_address_to_pio(phys_addr_t address)
  * architectures that have memory mapped IO functions defined (and the
  * PCI_IOBASE value defined) should call this function.
  */
+#ifndef pci_remap_iospace
 int pci_remap_iospace(const struct resource *res, phys_addr_t phys_addr)
 {
 #if defined(PCI_IOBASE) && defined(CONFIG_MMU)
@@ -4146,6 +4147,7 @@ int pci_remap_iospace(const struct resource *res, phys_addr_t phys_addr)
 #endif
 }
 EXPORT_SYMBOL(pci_remap_iospace);
+#endif
 
 /**
  * pci_unmap_iospace - Unmap the memory mapped I/O space
-- 
2.25.1