On 12/02/2011 01:59 PM, Dave Martin :
On Fri, Dec 02, 2011 at 02:53:17PM +0100, Nicolas Ferre wrote:
Signed-off-by: Nicolas Ferre<[email protected]>
---
Error found while using those iterators in an irq controller
initialization function.
May also need protection around irq and hwirq macro variables
but those values are usually plain "int" anyway... Tell me if you
feel that it should be done.
include/linux/irqdomain.h | 8 ++++----
1 files changed, 4 insertions(+), 4 deletions(-)
diff --git a/include/linux/irqdomain.h b/include/linux/irqdomain.h
index 99834e58..a553004 100644
--- a/include/linux/irqdomain.h
+++ b/include/linux/irqdomain.h
@@ -82,12 +82,12 @@ static inline unsigned int irq_domain_to_irq(struct
irq_domain *d,
}
#define irq_domain_for_each_hwirq(d, hw) \
- for (hw = d->hwirq_base; hw< d->hwirq_base + d->nr_irq; hw++)
+ for (hw = (d)->hwirq_base; hw< (d)->hwirq_base + (d)->nr_irq; hw++)
#define irq_domain_for_each_irq(d, hw, irq) \
- for (hw = d->hwirq_base, irq = irq_domain_to_irq(d, hw); \
- hw< d->hwirq_base + d->nr_irq; \
- hw++, irq = irq_domain_to_irq(d, hw))
+ for (hw = (d)->hwirq_base, irq = irq_domain_to_irq((d), hw); \
+ hw< (d)->hwirq_base + (d)->nr_irq; \
+ hw++, irq = irq_domain_to_irq((d), hw))
I suggest just putting all the brackets in -- if having spotted this
problem you only half-fix the macros, an opportunity is being missed;
someone have to come and fix it again later:
Exactly, this is why I added a little comment to the patch:
"May also need protection around irq and hwirq macro variables
but those values are usually plain "int" anyway... Tell me if you
feel that it should be done."
#define irq_domain_for_each_hwirq(d, hw) \
for ((hw) = (d)->hwirq_base; (hw)< (d)->hwirq_base + (d)->nr_irq;
(hw)++)
#define irq_domain_for_each_irq(d, hw, irq) \
for ((hw) = (d)->hwirq_base, (irq) = irq_domain_to_irq(d, hw); \
(hw)< (d)->hwirq_base + (d)->nr_irq; \
(hw)++, (irq) = irq_domain_to_irq(d, hw))
If you feel happier though, you can harmlessly add the extra brackets round
the arguments to irq_domain_to_irq(), without changing the behaviour.
Arguably the "always add brackets" rule is simpler to understand.
In fact, where a macro argument is not part of a larger expression, or is an
operand to a comma-expression, there's no need for extra brackets -- all
possible operators parse at higher priority than commas. A macro argument
which itself is a comma-expression whould have to be explicitly bracketed
in the macro invocation anyway, so there is no extra risk of the macro
expansion being parsed in an unexpected way in that case.
Thanks for the detailed explanation. I resend the patch with the "always
add brackets" corrections.
Best regards,
--
Nicolas Ferre
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