Re: [net-next PATCH v5 04/15] leds: Provide stubs for when CLASS_LED is disabled

[Andrew Lunn]

> Also why IS_ENABLED instead of a simple ifdef? (in leds.h there is a mix
> of both so I wonder if we should use one or the other)

/*
 * IS_ENABLED(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'y' or 'm',
 * 0 otherwise.  Note that CONFIG_FOO=y results in "#define CONFIG_FOO 1" in
 * autoconf.h, while CONFIG_FOO=m results in "#define CONFIG_FOO_MODULE 1".
 */
#define IS_ENABLED(option) __or(IS_BUILTIN(option), IS_MODULE(option))

It cleanly handles the module case, which i guess most people would
get wrong.

    Andrew