linux-kernel - [PATCH v2 3/6] um: Remove unused fields from thread

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Message-Id: <20240816095953.638401-4-tiwei.btw@antgroup.com>
Date: Fri, 16 Aug 2024 17:59:50 +0800
From: "Tiwei Bie" <tiwei.btw@...group.com>
To: richard@....at,
	anton.ivanov@...bridgegreys.com,
	johannes@...solutions.net
Cc:  <linux-um@...ts.infradead.org>,
   <linux-kernel@...r.kernel.org>,
  "Tiwei Bie" <tiwei.btw@...group.com>
Subject: [PATCH v2 3/6] um: Remove unused fields from thread_struct

These fields are no longer used since the removal of tt mode.

Signed-off-by: Tiwei Bie <tiwei.btw@...group.com>
---
 arch/um/include/asm/processor-generic.h | 20 +++++---------------
 arch/um/kernel/process.c                |  8 ++++----
 arch/um/kernel/skas/process.c           |  4 ++--
 3 files changed, 11 insertions(+), 21 deletions(-)

diff --git a/arch/um/include/asm/processor-generic.h b/arch/um/include/asm/processor-generic.h
index 5a7c05275aa7..bce4595798da 100644
--- a/arch/um/include/asm/processor-generic.h
+++ b/arch/um/include/asm/processor-generic.h
@@ -28,20 +28,10 @@ struct thread_struct {
 	struct arch_thread arch;
 	jmp_buf switch_buf;
 	struct {
-		int op;
-		union {
-			struct {
-				int pid;
-			} fork, exec;
-			struct {
-				int (*proc)(void *);
-				void *arg;
-			} thread;
-			struct {
-				void (*proc)(void *);
-				void *arg;
-			} cb;
-		} u;
+		struct {
+			int (*proc)(void *);
+			void *arg;
+		} thread;
 	} request;
 };
 
@@ -51,7 +41,7 @@ struct thread_struct {
 	.fault_addr		= NULL, \
 	.prev_sched		= NULL, \
 	.arch			= INIT_ARCH_THREAD, \
-	.request		= { 0 } \
+	.request		= { } \
 }
 
 /*
diff --git a/arch/um/kernel/process.c b/arch/um/kernel/process.c
index f36b63f53bab..be2856af6d4c 100644
--- a/arch/um/kernel/process.c
+++ b/arch/um/kernel/process.c
@@ -109,8 +109,8 @@ void new_thread_handler(void)
 		schedule_tail(current->thread.prev_sched);
 	current->thread.prev_sched = NULL;
 
-	fn = current->thread.request.u.thread.proc;
-	arg = current->thread.request.u.thread.arg;
+	fn = current->thread.request.thread.proc;
+	arg = current->thread.request.thread.arg;
 
 	/*
 	 * callback returns only if the kernel thread execs a process
@@ -158,8 +158,8 @@ int copy_thread(struct task_struct * p, const struct kernel_clone_args *args)
 		arch_copy_thread(&current->thread.arch, &p->thread.arch);
 	} else {
 		get_safe_registers(p->thread.regs.regs.gp, p->thread.regs.regs.fp);
-		p->thread.request.u.thread.proc = args->fn;
-		p->thread.request.u.thread.arg = args->fn_arg;
+		p->thread.request.thread.proc = args->fn;
+		p->thread.request.thread.arg = args->fn_arg;
 		handler = new_thread_handler;
 	}
 
diff --git a/arch/um/kernel/skas/process.c b/arch/um/kernel/skas/process.c
index 5f9c1c5f36e2..68657988c8d1 100644
--- a/arch/um/kernel/skas/process.c
+++ b/arch/um/kernel/skas/process.c
@@ -39,8 +39,8 @@ int __init start_uml(void)
 
 	init_new_thread_signals();
 
-	init_task.thread.request.u.thread.proc = start_kernel_proc;
-	init_task.thread.request.u.thread.arg = NULL;
+	init_task.thread.request.thread.proc = start_kernel_proc;
+	init_task.thread.request.thread.arg = NULL;
 	return start_idle_thread(task_stack_page(&init_task),
 				 &init_task.thread.switch_buf);
 }
-- 
2.34.1