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")).
get_c0_fdc_int() is defined only in arch/mips/mti-malta/malta-time.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 get_c0_fdc_int() definition with the default code and remove the
weak annotation from the declaration.
Signed-off-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
CC: James Hogan <james.hogan@xxxxxxxxxx>
---
arch/mips/include/asm/irq.h | 2 +-
drivers/tty/mips_ejtag_fdc.c | 9 ++++++---
2 files changed, 7 insertions(+), 4 deletions(-)
diff --git a/arch/mips/include/asm/irq.h b/arch/mips/include/asm/irq.h
index f0db99f8..15e0fec 100644
--- a/arch/mips/include/asm/irq.h
+++ b/arch/mips/include/asm/irq.h
@@ -49,7 +49,7 @@ extern int cp0_compare_irq_shift;
extern int cp0_perfcount_irq;
extern int cp0_fdc_irq;
-extern int __weak get_c0_fdc_int(void);
+extern int get_c0_fdc_int(void);
void arch_trigger_all_cpu_backtrace(bool);
#define arch_trigger_all_cpu_backtrace arch_trigger_all_cpu_backtrace
diff --git a/drivers/tty/mips_ejtag_fdc.c b/drivers/tty/mips_ejtag_fdc.c
index 358323c..a8c8cfd 100644
--- a/drivers/tty/mips_ejtag_fdc.c
+++ b/drivers/tty/mips_ejtag_fdc.c
@@ -879,6 +879,11 @@ static const struct tty_operations mips_ejtag_fdc_tty_ops = {
.chars_in_buffer = mips_ejtag_fdc_tty_chars_in_buffer,
};
+int __weak get_c0_fdc_int(void)
+{
+ return -1;
+}
+
static int mips_ejtag_fdc_tty_probe(struct mips_cdmm_device *dev)
{
int ret, nport;
@@ -967,9 +972,7 @@ static int mips_ejtag_fdc_tty_probe(struct mips_cdmm_device *dev)
wake_up_process(priv->thread);
/* Look for an FDC IRQ */
- priv->irq = -1;
- if (get_c0_fdc_int)
- priv->irq = get_c0_fdc_int();
+ priv->irq = get_c0_fdc_int();
/* Try requesting the IRQ */
if (priv->irq >= 0) {
