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um: Stop tracking host PID in cpu_tasks

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The host PID tracked in 'cpu_tasks' is no longer used. Stopping
tracking it will also save some cycles.

Signed-off-by: Tiwei Bie <tiwei.btw@antgroup.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
Tiwei Bie 2024-03-06 18:19:22 +08:00 committed by Richard Weinberger
parent dac847ae2b
commit f95bab8610
3 changed files with 2 additions and 15 deletions
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1
arch/um/include/shared/as-layout.h
View File

@ -31,7 +31,6 @@
#include <sysdep/ptrace.h>
struct cpu_task {
int pid;
void *task;
};

12
arch/um/kernel/process.c
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@ -43,13 +43,7 @@
* cares about its entry, so it's OK if another processor is modifying its
* entry.
*/
struct cpu_task cpu_tasks[NR_CPUS] = { [0 ... NR_CPUS - 1] = { -1, NULL } };
static inline int external_pid(void)
{
/* FIXME: Need to look up userspace_pid by cpu */
return userspace_pid[0];
}
struct cpu_task cpu_tasks[NR_CPUS] = { [0 ... NR_CPUS - 1] = { NULL } };
void free_stack(unsigned long stack, int order)
{
@ -70,8 +64,7 @@ unsigned long alloc_stack(int order, int atomic)
static inline void set_current(struct task_struct *task)
{
cpu_tasks[task_thread_info(task)->cpu] = ((struct cpu_task)
{ external_pid(), task });
cpu_tasks[task_thread_info(task)->cpu] = ((struct cpu_task) { task });
}
struct task_struct *__switch_to(struct task_struct *from, struct task_struct *to)
@ -206,7 +199,6 @@ void um_idle_sleep(void)
void arch_cpu_idle(void)
{
cpu_tasks[current_thread_info()->cpu].pid = os_getpid();
um_idle_sleep();
}

4
arch/um/kernel/skas/process.c
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@ -18,12 +18,8 @@ extern void start_kernel(void);
static int __init start_kernel_proc(void *unused)
{
int pid;
block_signals_trace();
pid = os_getpid();
cpu_tasks[0].pid = pid;
cpu_tasks[0].task = current;
start_kernel();