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* [PATCH v2 1/2] kconfig.h: Add IF_ENABLED() macro
@ 2020-12-13 23:54 Paul Cercueil
  2020-12-13 23:54 ` [PATCH v2 2/2] pinctrl: ingenic: Only support SoCs enabled in config Paul Cercueil
                   ` (2 more replies)
  0 siblings, 3 replies; 6+ messages in thread
From: Paul Cercueil @ 2020-12-13 23:54 UTC (permalink / raw)
  To: Linus Walleij
  Cc: Arnd Bergmann, od, linux-gpio, linux-kernel, Zhou Yanjie, Paul Cercueil

IF_ENABLED(CONFIG_FOO, ptr) evaluates to (ptr) if CONFIG_FOO is set to 'y'
or 'm', NULL otherwise. The (ptr) argument must be a pointer.

The IF_ENABLED() macro can be very useful to help GCC drop dead code.

For instance, consider the following:

    #ifdef CONFIG_FOO_SUSPEND
    static int foo_suspend(struct device *dev)
    {
       ...
    }
    #endif

    static struct pm_ops foo_ops = {
	#ifdef CONFIG_FOO_SUSPEND
        .suspend = foo_suspend,
	#endif
    };

While this works, the foo_suspend() macro is compiled conditionally,
only when CONFIG_FOO_SUSPEND is set. This is problematic, as there could
be a build bug in this function, we wouldn't have a way to know unless
the config option is set.

An alternative is to declare foo_suspend() always, but mark it as maybe
unused:

    static int __maybe_unused foo_suspend(struct device *dev)
    {
       ...
    }

    static struct pm_ops foo_ops = {
	#ifdef CONFIG_FOO_SUSPEND
        .suspend = foo_suspend,
	#endif
    };

Again, this works, but the __maybe_unused attribute is required to
instruct the compiler that the function may not be referenced anywhere,
and is safe to remove without making a fuss about it. This makes the
programmer responsible for tagging the functions that can be
garbage-collected.

With this patch, it is now possible to write the following:

    static int foo_suspend(struct device *dev)
    {
       ...
    }

    static struct pm_ops foo_ops = {
        .suspend = IF_ENABLED(CONFIG_FOO_SUSPEND, foo_suspend),
    };

The foo_suspend() function will now be automatically dropped by the
compiler, and it does not require any specific attribute.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
---

Notes:
    v2: Only add IF_ENABLED() and don't verify that the argument is a
        pointer; since the second argument of the ?: ternary operator
    	is NULL, the compiler should issue an error if the other
    	argument is not a pointer.

 include/linux/kconfig.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/linux/kconfig.h b/include/linux/kconfig.h
index 9d12c970f18f..e78e17a76dc9 100644
--- a/include/linux/kconfig.h
+++ b/include/linux/kconfig.h
@@ -72,4 +72,10 @@
  */
 #define IS_ENABLED(option) __or(IS_BUILTIN(option), IS_MODULE(option))
 
+/*
+ * IF_ENABLED(CONFIG_FOO, ptr) evaluates to (ptr) if CONFIG_FOO is set to 'y'
+ * or 'm', NULL otherwise.
+ */
+#define IF_ENABLED(option, ptr) (IS_ENABLED(option) ? (ptr) : NULL)
+
 #endif /* __LINUX_KCONFIG_H */
-- 
2.29.2


^ permalink raw reply	[flat|nested] 6+ messages in thread
end of thread, other threads:[~2021-01-18 15:20 UTC | newest]

Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-12-13 23:54 [PATCH v2 1/2] kconfig.h: Add IF_ENABLED() macro Paul Cercueil
2020-12-13 23:54 ` [PATCH v2 2/2] pinctrl: ingenic: Only support SoCs enabled in config Paul Cercueil
2020-12-14  9:05 ` [PATCH v2 1/2] kconfig.h: Add IF_ENABLED() macro Linus Walleij
2021-01-11  8:45   ` Paul Cercueil
2021-01-15 11:47     ` Arnd Bergmann
2021-01-18 15:14 ` Linus Walleij

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