From 0ce055f85335e48bc571114d61a70ae217039362 Mon Sep 17 00:00:00 2001 From: Sebastian Andrzej Siewior Date: Thu, 17 Feb 2022 11:24:06 +0100 Subject: [PATCH] fork: Use IS_ENABLED() in account_kernel_stack() Not strickly needed but checking CONFIG_VMAP_STACK instead of task_stack_vm_area()' result allows the compiler the remove the else path in the CONFIG_VMAP_STACK case where the pointer can't be NULL. Check for CONFIG_VMAP_STACK in order to use the proper path. Signed-off-by: Sebastian Andrzej Siewior Signed-off-by: Thomas Gleixner Acked-by: Andy Lutomirski Link: https://lore.kernel.org/r/20220217102406.3697941-9-bigeasy@linutronix.de --- kernel/fork.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/kernel/fork.c b/kernel/fork.c index 177bc64..1279b57 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -485,16 +485,16 @@ void vm_area_free(struct vm_area_struct *vma) static void account_kernel_stack(struct task_struct *tsk, int account) { - void *stack = task_stack_page(tsk); - struct vm_struct *vm = task_stack_vm_area(tsk); - - if (vm) { + if (IS_ENABLED(CONFIG_VMAP_STACK)) { + struct vm_struct *vm = task_stack_vm_area(tsk); int i; for (i = 0; i < THREAD_SIZE / PAGE_SIZE; i++) mod_lruvec_page_state(vm->pages[i], NR_KERNEL_STACK_KB, account * (PAGE_SIZE / 1024)); } else { + void *stack = task_stack_page(tsk); + /* All stack pages are in the same node. */ mod_lruvec_kmem_state(stack, NR_KERNEL_STACK_KB, account * (THREAD_SIZE / 1024)); -- 2.7.4