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fork, IA64: Provide alloc_thread_stack_node() for IA64

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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: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Andy Lutomirski <luto@kernel.org>
Link: https://lore.kernel.org/r/20220217102406.3697941-4-bigeasy@linutronix.de
This commit is contained in:
Sebastian Andrzej Siewior 2022-02-17 11:24:01 +01:00 • committed by Thomas Gleixner
parent 546c42b2c5
commit 2bb0529c0b
2 changed files with 20 additions and 3 deletions
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6
arch/ia64/include/asm/thread_info.h
View file

@ -55,15 +55,15 @@ struct thread_info {
#ifndef ASM_OFFSETS_C #ifndef ASM_OFFSETS_C
/* how to get the thread information struct from C */ /* how to get the thread information struct from C */
#define current_thread_info() ((struct thread_info *) ((char *) current + IA64_TASK_SIZE)) #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)) ((unsigned long *) ((char *) (tsk) + IA64_TASK_SIZE))
#define task_thread_info(tsk) ((struct thread_info *) ((char *) (tsk) + IA64_TASK_SIZE)) #define task_thread_info(tsk) ((struct thread_info *) ((char *) (tsk) + IA64_TASK_SIZE))
#else #else
#define current_thread_info() ((struct thread_info *) 0) #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) #define task_thread_info(tsk) ((struct thread_info *) 0)
#endif #endif
#define free_thread_stack(tsk) /* nothing */ #define arch_free_thread_stack(tsk) /* nothing */
#define task_stack_page(tsk) ((void *)(tsk)) #define task_stack_page(tsk) ((void *)(tsk))
#define __HAVE_THREAD_FUNCTIONS #define __HAVE_THREAD_FUNCTIONS

17
kernel/fork.c
View file

@ -330,6 +330,23 @@ void thread_stack_cache_init(void)
} }
# endif /* THREAD_SIZE >= PAGE_SIZE || defined(CONFIG_VMAP_STACK) */ # 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 */ #endif /* !CONFIG_ARCH_THREAD_STACK_ALLOCATOR */
/* SLAB cache for signal_struct structures (tsk->signal) */ /* SLAB cache for signal_struct structures (tsk->signal) */