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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 <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Andy Lutomirski <luto@kernel.org>
Link: https://lore.kernel.org/r/20220217102406.3697941-9-bigeasy@linutronix.de
This commit is contained in:
Sebastian Andrzej Siewior 2022-02-17 11:24:06 +01:00 committed by Thomas Gleixner
parent e540bf3162
commit 0ce055f853
1 changed files with 4 additions and 4 deletions
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8
kernel/fork.c
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@ -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));