CODEWITHSUNDEEP
linux-kernel
tunu
tunu

Reputation: 72

Why is keyword sched used before down function of the semaphore code?

   `static noinline void __sched __down(struct semaphore *sem)`

In the above function, why is __sched used before the __down function of the semaphore code?

Upvotes: 1

Views: 594

Answers (1)

Ortwin Angermeier
Ortwin Angermeier

Reputation: 6203

__sched is a macro and not keyword, adding an attribute to the function, think of it as some added meta-information.

As defined in <linux/sched.h>: 

/* Attach to any functions which should be ignored in wchan output. */
#define __sched         __attribute__((__section__(".sched.text")))

So adding the __sched macro to a function results in supressing the wchan information for that function.

Upvotes: 3

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