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Date: Thu, 29 Sep 2022 07:59:03 +0800 From: Tiezhu Yang <yangtiezhu@...ngson.cn> To: Huacai Chen <chenhuacai@...nel.org> Cc: loongarch@...ts.linux.dev, linux-kernel@...r.kernel.org Subject: [PATCH] LoongArch: Remove some save operations in SAVE_SOME and handle_syscall 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@...ngson.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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