sw64: remove unused members from pcb_struct

Sunway inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I56OLG

--------------------------------

Since we have removed hmcall swpctx invocations, some members of
struct pcb_struct become useless. This patch removes them to reduce
the struct size.

As a result, struct processor_state is simplified too.
Signed-off-by: NHe Sheng <hesheng@wxiat.com>
Signed-off-by: NGu Zitao <guzitao@wxiat.com>

arch/sw_64/include/asm/suspend.h

@@ -39,7 +39,7 @@ struct processor_state {
 	struct callee_saved_fpregs fpregs;
 	unsigned long fpcr;
 #ifdef CONFIG_HIBERNATION
-	struct pcb_struct pcb;
+	unsigned long sp;
 	struct vcpucb vcb;
 #endif
 };

arch/sw_64/include/asm/thread_info.h

@@ -15,13 +15,8 @@ typedef struct {
 
 
 struct pcb_struct {
-	unsigned long ksp;
 	unsigned long usp;
-	unsigned long ptbr;
-	unsigned int pcc;
-	unsigned int asn;
 	unsigned long tp;
-	unsigned long flags;
 	unsigned long da_match, da_mask;
 	unsigned long dv_match, dv_mask;
 	unsigned long dc_ctl;

arch/sw_64/kernel/asm-offsets.c

@@ -33,9 +33,8 @@ void foo(void)
 	OFFSET(PSTATE_FPREGS, processor_state, fpregs);
 	OFFSET(PSTATE_FPCR, processor_state, fpcr);
 #ifdef CONFIG_HIBERNATION
-	OFFSET(PSTATE_PCB, processor_state, pcb);
+	OFFSET(PSTATE_SP, processor_state, sp);
 #endif
-	OFFSET(PCB_KSP, pcb_struct, ksp);
 	OFFSET(PBE_ADDR, pbe, address);
 	OFFSET(PBE_ORIG_ADDR, pbe, orig_address);
 	OFFSET(PBE_NEXT, pbe, next);

arch/sw_64/kernel/hibernate_asm.S

@@ -30,8 +30,7 @@ ENTRY(swsusp_arch_suspend)
 	rfpcr	$f0
 	fstd	$f0, PSTATE_FPCR($16)
 
-	ldi	$1, PSTATE_PCB($16)
-	stl	sp, PCB_KSP($1)
+	stl	sp, PSTATE_SP($16)
 	call	swsusp_save
 	ldi	$16, hibernate_state
 	ldi	$1, PSTATE_REGS($16)
@@ -112,8 +111,7 @@ $hibernate_setfpec_over:
 	vldd	$f8, CALLEE_F8($1)
 	vldd	$f9, CALLEE_F9($1)
 
-	ldi	$1, PSTATE_PCB($16)
-	ldl	sp, PCB_KSP($1)
+	ldl	sp, PSTATE_SP($16)
 
 	ldi	$8, 0x3fff
 	bic	sp, $8, $8

arch/sw_64/kernel/process.c

@@ -160,7 +160,6 @@ copy_thread(unsigned long clone_flags, unsigned long usp,
 	struct pt_regs *childregs = task_pt_regs(p);
 	struct pt_regs *regs = current_pt_regs();
 
-	childti->pcb.flags = 7;	/* set FEN, clear everything else */
 	p->thread.sp = (unsigned long) childregs;
 
 	if (unlikely(p->flags & PF_KTHREAD)) {

arch/sw_64/kernel/traps.c

@@ -283,7 +283,6 @@ do_entIF(unsigned long inst_type, struct pt_regs *regs)
 		 * attacks. So turn the bleeding FPU back on and be done
 		 * with it.
 		 */
-		current_thread_info()->pcb.flags |= 1;
 		fpu_enable();
 		return;