Commit f95bab86 authored by Tiwei Bie's avatar Tiwei Bie Committed by Richard Weinberger
Browse files

um: Stop tracking host PID in cpu_tasks 



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

Signed-off-by: default avatarTiwei Bie <tiwei.btw@antgroup.com>
Signed-off-by: default avatarRichard Weinberger <richard@nod.at>
parent dac847ae

arch/um/include/shared/as-layout.h

+0 −1
Original line number Diff line number Diff line
@@ -31,7 +31,6 @@ 
#include <sysdep/ptrace.h>



struct cpu_task {

	int pid;

	void *task;

};

arch/um/kernel/process.c

+2 −10
Original line number Diff line number Diff line
@@ -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();

}

arch/um/kernel/skas/process.c

+0 −4
Original line number Diff line number Diff line
@@ -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();