linux-kernel - [PATCH -next v5 1/3] x86/mce: remove redundant fixup type EX_TYPE

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Date: Sun, 4 Feb 2024 16:26:25 +0800
From: Tong Tiangen <tongtiangen@...wei.com>
To: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
	Borislav Petkov <bp@...en8.de>, <wangkefeng.wang@...wei.com>, Dave Hansen
	<dave.hansen@...ux.intel.com>, <x86@...nel.org>, "H. Peter Anvin"
	<hpa@...or.com>, Tony Luck <tony.luck@...el.com>, Andy Lutomirski
	<luto@...nel.org>, Peter Zijlstra <peterz@...radead.org>, Andrew Morton
	<akpm@...ux-foundation.org>, Naoya Horiguchi <naoya.horiguchi@....com>
CC: <linux-kernel@...r.kernel.org>, <linux-edac@...r.kernel.org>,
	<linux-mm@...ck.org>, Tong Tiangen <tongtiangen@...wei.com>, Guohanjun
	<guohanjun@...wei.com>
Subject: [PATCH -next v5 1/3] x86/mce: remove redundant fixup type EX_TYPE_COPY

Since commit 034ff37d3407 ("x86: rewrite '__copy_user_nocache' function")
rewrited __copy_user_nocache() uses EX_TYPE_UACCESS instead of
EX_TYPE_COPY, there is no user for EX_TYPE_COPY, so remove it.

Signed-off-by: Tong Tiangen <tongtiangen@...wei.com>
---
 arch/x86/include/asm/asm.h                 | 3 ---
 arch/x86/include/asm/extable_fixup_types.h | 2 +-
 arch/x86/kernel/cpu/mce/severity.c         | 1 -
 arch/x86/mm/extable.c                      | 9 ---------
 4 files changed, 1 insertion(+), 14 deletions(-)

diff --git a/arch/x86/include/asm/asm.h b/arch/x86/include/asm/asm.h
index fbcfec4dc4cc..692409ea0c37 100644
--- a/arch/x86/include/asm/asm.h
+++ b/arch/x86/include/asm/asm.h
@@ -215,9 +215,6 @@ register unsigned long current_stack_pointer asm(_ASM_SP);
 #define _ASM_EXTABLE_UA(from, to)				\
 	_ASM_EXTABLE_TYPE(from, to, EX_TYPE_UACCESS)
 
-#define _ASM_EXTABLE_CPY(from, to)				\
-	_ASM_EXTABLE_TYPE(from, to, EX_TYPE_COPY)
-
 #define _ASM_EXTABLE_FAULT(from, to)				\
 	_ASM_EXTABLE_TYPE(from, to, EX_TYPE_FAULT)
 
diff --git a/arch/x86/include/asm/extable_fixup_types.h b/arch/x86/include/asm/extable_fixup_types.h
index 7acf0383be80..906b0d5541e8 100644
--- a/arch/x86/include/asm/extable_fixup_types.h
+++ b/arch/x86/include/asm/extable_fixup_types.h
@@ -36,7 +36,7 @@
 #define	EX_TYPE_DEFAULT			 1
 #define	EX_TYPE_FAULT			 2
 #define	EX_TYPE_UACCESS			 3
-#define	EX_TYPE_COPY			 4
+/* unused, was: #define EX_TYPE_COPY	 4 */
 #define	EX_TYPE_CLEAR_FS		 5
 #define	EX_TYPE_FPU_RESTORE		 6
 #define	EX_TYPE_BPF			 7
diff --git a/arch/x86/kernel/cpu/mce/severity.c b/arch/x86/kernel/cpu/mce/severity.c
index c4477162c07d..bca780fa5e57 100644
--- a/arch/x86/kernel/cpu/mce/severity.c
+++ b/arch/x86/kernel/cpu/mce/severity.c
@@ -290,7 +290,6 @@ static noinstr int error_context(struct mce *m, struct pt_regs *regs)
 
 	switch (fixup_type) {
 	case EX_TYPE_UACCESS:
-	case EX_TYPE_COPY:
 		if (!copy_user)
 			return IN_KERNEL;
 		m->kflags |= MCE_IN_KERNEL_COPYIN;
diff --git a/arch/x86/mm/extable.c b/arch/x86/mm/extable.c
index b522933bfa56..51986e8a9d35 100644
--- a/arch/x86/mm/extable.c
+++ b/arch/x86/mm/extable.c
@@ -164,13 +164,6 @@ static bool ex_handler_uaccess(const struct exception_table_entry *fixup,
 	return ex_handler_default(fixup, regs);
 }
 
-static bool ex_handler_copy(const struct exception_table_entry *fixup,
-			    struct pt_regs *regs, int trapnr)
-{
-	WARN_ONCE(trapnr == X86_TRAP_GP, "General protection fault in user access. Non-canonical address?");
-	return ex_handler_fault(fixup, regs, trapnr);
-}
-
 static bool ex_handler_msr(const struct exception_table_entry *fixup,
 			   struct pt_regs *regs, bool wrmsr, bool safe, int reg)
 {
@@ -341,8 +334,6 @@ int fixup_exception(struct pt_regs *regs, int trapnr, unsigned long error_code,
 		return ex_handler_fault(e, regs, trapnr);
 	case EX_TYPE_UACCESS:
 		return ex_handler_uaccess(e, regs, trapnr, fault_addr);
-	case EX_TYPE_COPY:
-		return ex_handler_copy(e, regs, trapnr);
 	case EX_TYPE_CLEAR_FS:
 		return ex_handler_clear_fs(e, regs);
 	case EX_TYPE_FPU_RESTORE:
-- 
2.25.1