[PATCH] LoongArch: Remove some save operations in SAVE_SOME and handle_syscall

[Tiezhu Yang]

No need to save the control and status registers CRMD, EUEN, ECFG
and ESTAT in SAVE_SOME and handle_syscall as they are not restored
later in RESTORE_SOME.

Signed-off-by: Tiezhu Yang <yangtiezhu@xxxxxxxxxxx>
---
 arch/loongarch/include/asm/stackframe.h | 9 ---------
 arch/loongarch/kernel/entry.S           | 8 --------
 2 files changed, 17 deletions(-)

diff --git a/arch/loongarch/include/asm/stackframe.h b/arch/loongarch/include/asm/stackframe.h
index 4ca9530..733dc9e 100644
--- a/arch/loongarch/include/asm/stackframe.h
+++ b/arch/loongarch/include/asm/stackframe.h
@@ -114,14 +114,6 @@
 	LONG_S	zero, sp, PT_R0
 	csrrd	t0, LOONGARCH_CSR_PRMD
 	LONG_S	t0, sp, PT_PRMD
-	csrrd	t0, LOONGARCH_CSR_CRMD
-	LONG_S	t0, sp, PT_CRMD
-	csrrd	t0, LOONGARCH_CSR_EUEN
-	LONG_S  t0, sp, PT_EUEN
-	csrrd	t0, LOONGARCH_CSR_ECFG
-	LONG_S	t0, sp, PT_ECFG
-	csrrd	t0, LOONGARCH_CSR_ESTAT
-	PTR_S	t0, sp, PT_ESTAT
 	cfi_st	ra, PT_R1, \docfi
 	cfi_st	a0, PT_R4, \docfi
 	cfi_st	a1, PT_R5, \docfi
@@ -140,7 +132,6 @@
 	cfi_st	fp, PT_R22, \docfi
 
 	/* Set thread_info if we're coming from user mode */
-	csrrd	t0, LOONGARCH_CSR_PRMD
 	andi	t0, t0, 0x3	/* extract pplv bit */
 	beqz	t0, 9f
 
diff --git a/arch/loongarch/kernel/entry.S b/arch/loongarch/kernel/entry.S
index d53b631..893e632 100644
--- a/arch/loongarch/kernel/entry.S
+++ b/arch/loongarch/kernel/entry.S
@@ -31,14 +31,6 @@ SYM_FUNC_START(handle_syscall)
 	st.d	zero, sp, PT_R0
 	csrrd	t2, LOONGARCH_CSR_PRMD
 	st.d	t2, sp, PT_PRMD
-	csrrd	t2, LOONGARCH_CSR_CRMD
-	st.d	t2, sp, PT_CRMD
-	csrrd	t2, LOONGARCH_CSR_EUEN
-	st.d	t2, sp, PT_EUEN
-	csrrd	t2, LOONGARCH_CSR_ECFG
-	st.d	t2, sp, PT_ECFG
-	csrrd	t2, LOONGARCH_CSR_ESTAT
-	st.d	t2, sp, PT_ESTAT
 	cfi_st	ra, PT_R1
 	cfi_st	a0, PT_R4
 	cfi_st	a1, PT_R5
-- 
2.1.0