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authorStephen Boyd <[email protected]>2021-01-22 19:44:28 -0800
committerRob Herring <[email protected]>2021-01-28 15:53:08 -0600
commitc52eef0b6ee1a3c57f6fccb30ea0b5ae19358471 (patch)
tree171693947dfc94ba9fd0b54b2b073ef0488b4100
parent6e09d75513d2670b7ab91ab3584fc5bcf2675a75 (diff)
of/device: Don't NULLify match table in of_match_device() with CONFIG_OF=n
This effectively reverts 1db73ae39a97 ("of/device: Nullify match table in of_match_device() for CONFIG_OF=n") because that commit makes it more surprising to users of this API that the arguments may never be referenced by any code. This is because the pre-processor will replace the argument with NULL and then the match table will be left unreferenced by any code but the compiler optimizer doesn't know to drop it. This can lead to compilers warning that match tables are unused, when we really want to pass the match table to the API but have the compiler see that it's all inlined and not used and then drop the match table while silencing the warning. We're being too smart here and not giving the compiler the chance to do dead code elimination. Signed-off-by: Stephen Boyd <[email protected]> Acked-by: Frank Rowand <[email protected]> Cc: Arnd Bergmann <[email protected]> Cc: Geert Uytterhoeven <[email protected]> Cc: Rob Herring <[email protected]> Cc: Frank Rowand <[email protected]> Reviewed-by: Geert Uytterhoeven <[email protected]> Acked-by: Geert Uytterhoeven <[email protected]> Reviewed-by: Arnd Bergmann <[email protected]> Signed-off-by: Rob Herring <[email protected]> Link: https://lore.kernel.org/r/[email protected]
-rw-r--r--include/linux/of_device.h4
1 files changed, 1 insertions, 3 deletions
diff --git a/include/linux/of_device.h b/include/linux/of_device.h
index 07ca187fc5e4..937f32f6aecb 100644
--- a/include/linux/of_device.h
+++ b/include/linux/of_device.h
@@ -99,13 +99,11 @@ static inline int of_device_uevent_modalias(struct device *dev,
static inline void of_device_node_put(struct device *dev) { }
-static inline const struct of_device_id *__of_match_device(
+static inline const struct of_device_id *of_match_device(
const struct of_device_id *matches, const struct device *dev)
{
return NULL;
}
-#define of_match_device(matches, dev) \
- __of_match_device(of_match_ptr(matches), (dev))
static inline struct device_node *of_cpu_device_node_get(int cpu)
{