Weak header file declarations are error-prone because they make every
definition weak, and the linker chooses one based on link order (see
10629d711ed7 ("PCI: Remove __weak annotation from pcibios_get_phb_of_node
decl")).
mips_cdmm_phys_base() is defined only in arch/mips/mti-malta/malta-memory.c
so there's no problem with multiple definitions. But it works better to
have a weak default implementation and allow a strong function to override
it. Then we don't have to test whether a definition is present, and if
there are ever multiple strong definitions, we get a link error instead of
calling a random definition.
Add a weak mips_cdmm_phys_base() definition and remove the weak annotation
from the declaration in arch/mips/include/asm/cdmm.h.
Signed-off-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
CC: James Hogan <james.hogan@xxxxxxxxxx>
---
arch/mips/include/asm/cdmm.h | 4 ++--
drivers/bus/mips_cdmm.c | 14 +++++++++++++-
2 files changed, 15 insertions(+), 3 deletions(-)
diff --git a/arch/mips/include/asm/cdmm.h b/arch/mips/include/asm/cdmm.h
index 16e22ce..bece206 100644
--- a/arch/mips/include/asm/cdmm.h
+++ b/arch/mips/include/asm/cdmm.h
@@ -53,7 +53,7 @@ struct mips_cdmm_driver {
* mips_cdmm_phys_base() - Choose a physical base address for CDMM region.
*
* Picking a suitable physical address at which to map the CDMM region is
- * platform specific, so this weak function can be defined by platform code to
+ * platform specific, so this function can be defined by platform code to
* pick a suitable value if none is configured by the bootloader.
*
* This address must be 32kB aligned, and the region occupies a maximum of 32kB
@@ -61,7 +61,7 @@ struct mips_cdmm_driver {
*
* Returns: Physical base address for CDMM region, or 0 on failure.
*/
-phys_addr_t __weak mips_cdmm_phys_base(void);
+phys_addr_t mips_cdmm_phys_base(void);
extern struct bus_type mips_cdmm_bustype;
void __iomem *mips_cdmm_early_probe(unsigned int dev_type);
diff --git a/drivers/bus/mips_cdmm.c b/drivers/bus/mips_cdmm.c
index ab3bde1..1c543ef 100644
--- a/drivers/bus/mips_cdmm.c
+++ b/drivers/bus/mips_cdmm.c
@@ -332,6 +332,18 @@ static phys_addr_t mips_cdmm_cur_base(void)
}
/**
+ * mips_cdmm_phys_base() - Choose a physical base address for CDMM region.
+ *
+ * Picking a suitable physical address at which to map the CDMM region is
+ * platform specific, so this weak function can be overridden by platform
+ * code to pick a suitable value if none is configured by the bootloader.
+ */
+phys_addr_t __weak mips_cdmm_phys_base(void)
+{
+ return 0;
+}
+
+/**
* mips_cdmm_setup() - Ensure the CDMM bus is initialised and usable.
* @bus: Pointer to bus information for current CPU.
* IS_ERR(bus) is checked, so no need for caller to check.
@@ -368,7 +380,7 @@ static int mips_cdmm_setup(struct mips_cdmm_bus *bus)
if (!bus->phys)
bus->phys = mips_cdmm_cur_base();
/* Otherwise, ask platform code for suggestions */
- if (!bus->phys && mips_cdmm_phys_base)
+ if (!bus->phys)
bus->phys = mips_cdmm_phys_base();
/* Otherwise, copy what other CPUs have done */
if (!bus->phys)
