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authorTiwei Bie <tiwei.btw@antgroup.com>2024-03-06 11:19:22 +0100
committerRichard Weinberger <richard@nod.at>2024-04-30 14:11:30 +0200
commitf95bab86106ee5b180b197a68246282b56ef5d8a (patch)
tree1b72f825019083516fe297076f04fd078a156b30 /arch/um/kernel
parentum: process: remove unused 'n' variable (diff)
downloadlinux-f95bab86106ee5b180b197a68246282b56ef5d8a.tar.xz
linux-f95bab86106ee5b180b197a68246282b56ef5d8a.zip
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: Tiwei Bie <tiwei.btw@antgroup.com> Signed-off-by: Richard Weinberger <richard@nod.at>
Diffstat (limited to 'arch/um/kernel')
-rw-r--r--arch/um/kernel/process.c12
-rw-r--r--arch/um/kernel/skas/process.c4
2 files changed, 2 insertions, 14 deletions
diff --git a/arch/um/kernel/process.c b/arch/um/kernel/process.c
index e5d7d24045a2..d2134802f6a8 100644
--- a/arch/um/kernel/process.c
+++ b/arch/um/kernel/process.c
@@ -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();
}
diff --git a/arch/um/kernel/skas/process.c b/arch/um/kernel/skas/process.c
index fdd5922f9222..99a5cbb36083 100644
--- a/arch/um/kernel/skas/process.c
+++ b/arch/um/kernel/skas/process.c
@@ -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();