Commit 2bb0529c authored by Sebastian Andrzej Siewior's avatar Sebastian Andrzej Siewior Committed by Thomas Gleixner
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fork, IA64: Provide alloc_thread_stack_node() for IA64 



Provide a generic alloc_thread_stack_node() for IA64 and
CONFIG_ARCH_THREAD_STACK_ALLOCATOR which returns stack pointer and sets
task_struct::stack so it behaves exactly like the other implementations.

Rename IA64's alloc_thread_stack_node() and add the generic version to the
fork code so it is in one place _and_ to drastically lower the chances of
fat fingering the IA64 code.  Do the same for free_thread_stack().

Signed-off-by: default avatarSebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Acked-by: default avatarAndy Lutomirski <luto@kernel.org>
Link: https://lore.kernel.org/r/20220217102406.3697941-4-bigeasy@linutronix.de
parent 546c42b2

arch/ia64/include/asm/thread_info.h

+3 −3
Original line number Diff line number Diff line
@@ -55,15 +55,15 @@ struct thread_info { 
#ifndef ASM_OFFSETS_C

/* how to get the thread information struct from C */

#define current_thread_info()	((struct thread_info *) ((char *) current + IA64_TASK_SIZE))

#define alloc_thread_stack_node(tsk, node)	\

#define arch_alloc_thread_stack_node(tsk, node)	\

		((unsigned long *) ((char *) (tsk) + IA64_TASK_SIZE))

#define task_thread_info(tsk)	((struct thread_info *) ((char *) (tsk) + IA64_TASK_SIZE))

#else

#define current_thread_info()	((struct thread_info *) 0)

#define alloc_thread_stack_node(tsk, node)	((unsigned long *) 0)

#define arch_alloc_thread_stack_node(tsk, node)	((unsigned long *) 0)

#define task_thread_info(tsk)	((struct thread_info *) 0)

#endif

#define free_thread_stack(tsk)	/* nothing */

#define arch_free_thread_stack(tsk)	/* nothing */

#define task_stack_page(tsk)	((void *)(tsk))



#define __HAVE_THREAD_FUNCTIONS

kernel/fork.c

+17 −0
Original line number Diff line number Diff line
@@ -330,6 +330,23 @@ void thread_stack_cache_init(void) 
}



# endif /* THREAD_SIZE >= PAGE_SIZE || defined(CONFIG_VMAP_STACK) */

#else /* CONFIG_ARCH_THREAD_STACK_ALLOCATOR */



static unsigned long *alloc_thread_stack_node(struct task_struct *tsk, int node)

{

	unsigned long *stack;



	stack = arch_alloc_thread_stack_node(tsk, node);

	tsk->stack = stack;

	return stack;

}



static void free_thread_stack(struct task_struct *tsk)

{

	arch_free_thread_stack(tsk);

	tsk->stack = NULL;

}



#endif /* !CONFIG_ARCH_THREAD_STACK_ALLOCATOR */



/* SLAB cache for signal_struct structures (tsk->signal) */