sched/headers: Remove <linux/sched.h> from <linux/sched/autogroup.h>
The <linux/sched/autogroup.h> file is a largely self-contained header and users of it either don't need <linux/sched.h> - or have already included it. Add a 'task_struct' predeclaration to make it build standalone. This reduces the size of the header dependency graph. Acked-by: NLinus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: NIngo Molnar <mingo@kernel.org>
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