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Subject[PATCH] LoongArch: Remove some save operations in SAVE_SOME and handle_syscall
Date
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@loongson.cn>
---
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
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