Merge tag 'x86-cleanups-2024-05-13' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 cleanups from Ingo Molnar:

 - Fix function prototypes to address clang function type cast
   warnings in the math-emu code

 - Reorder definitions in <asm/msr-index.h>

 - Remove unused code

 - Fix typos

 - Simplify #include sections

* tag 'x86-cleanups-2024-05-13' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/pci/ce4100: Remove unused 'struct sim_reg_op'
  x86/msr: Move ARCH_CAP_XAPIC_DISABLE bit definition to its rightful place
  x86/math-emu: Fix function cast warnings
  x86/extable: Remove unused fixup type EX_TYPE_COPY
  x86/rtc: Remove unused intel-mid.h
  x86/32: Remove unused IA32_STACK_TOP and two externs
  x86/head: Simplify relative include path to xen-head.S
  x86/fred: Fix typo in Kconfig description
  x86/syscall/compat: Remove ia32_unistd.h
  x86/syscall/compat: Remove unused macro __SYSCALL_ia32_NR
  x86/virt/tdx: Remove duplicate include
  x86/xen: Remove duplicate #include

arch/x86/Kconfig

@@ -501,7 +501,7 @@ config X86_FRED
 	  When enabled, try to use Flexible Return and Event Delivery
 	  instead of the legacy SYSCALL/SYSENTER/IDT architecture for
 	  ring transitions and exception/interrupt handling if the
-	  system supports.
+	  system supports it.
 
 config X86_BIGSMP
 	bool "Support for big SMP systems with more than 8 CPUs"

arch/x86/entry/entry_64_compat.S

@@ -7,7 +7,6 @@
 #include <asm/asm-offsets.h>
 #include <asm/current.h>
 #include <asm/errno.h>
-#include <asm/ia32_unistd.h>
 #include <asm/thread_info.h>
 #include <asm/segment.h>
 #include <asm/irqflags.h>

arch/x86/include/asm/asm.h

@@ -229,9 +229,6 @@ 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)
 

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

arch/x86/include/asm/ia32.h

@@ -56,17 +56,6 @@ struct stat64 {
 	unsigned long long	st_ino;
 } __attribute__((packed));
 
-#define IA32_STACK_TOP IA32_PAGE_OFFSET
-
-#ifdef __KERNEL__
-struct linux_binprm;
-extern int ia32_setup_arg_pages(struct linux_binprm *bprm,
-				unsigned long stack_top, int exec_stack);
-struct mm_struct;
-extern void ia32_pick_mmap_layout(struct mm_struct *mm);
-
-#endif
-
 extern bool __ia32_enabled;
 
 static __always_inline bool ia32_enabled(void)

arch/x86/include/asm/ia32_unistd.h

-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _ASM_X86_IA32_UNISTD_H
-#define _ASM_X86_IA32_UNISTD_H
-
-/*
- * This file contains the system call numbers of the ia32 compat ABI,
- * this is for the kernel only.
- */
-#define __SYSCALL_ia32_NR(x) (x)
-#include <asm/unistd_32_ia32.h>
-
-#endif /* _ASM_X86_IA32_UNISTD_H */

arch/x86/include/asm/msr-index.h

@@ -170,6 +170,10 @@
 						 * CPU is not affected by Branch
 						 * History Injection.
 						 */
+#define ARCH_CAP_XAPIC_DISABLE		BIT(21)	/*
+						 * IA32_XAPIC_DISABLE_STATUS MSR
+						 * supported
+						 */
 #define ARCH_CAP_PBRSB_NO		BIT(24)	/*
 						 * Not susceptible to Post-Barrier
 						 * Return Stack Buffer Predictions.
@@ -192,11 +196,6 @@
 						 * File.
 						 */
 
-#define ARCH_CAP_XAPIC_DISABLE		BIT(21)	/*
-						 * IA32_XAPIC_DISABLE_STATUS MSR
-						 * supported
-						 */
-
 #define MSR_IA32_FLUSH_CMD		0x0000010b
 #define L1D_FLUSH			BIT(0)	/*
 						 * Writeback and invalidate the

arch/x86/include/asm/seccomp.h

@@ -9,7 +9,7 @@
 #endif
 
 #ifdef CONFIG_COMPAT
-#include <asm/ia32_unistd.h>
+#include <asm/unistd_32_ia32.h>
 #define __NR_seccomp_read_32		__NR_ia32_read
 #define __NR_seccomp_write_32		__NR_ia32_write
 #define __NR_seccomp_exit_32		__NR_ia32_exit

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;

arch/x86/kernel/head_32.S

@@ -491,7 +491,7 @@ __INITRODATA
 int_msg:
 	.asciz "Unknown interrupt or fault at: %p %p %p\n"
 
-#include "../../x86/xen/xen-head.S"
+#include "../xen/xen-head.S"
 
 /*
  * The IDT and GDT 'descriptors' are a strange 48-bit object

arch/x86/kernel/head_64.S

@@ -720,7 +720,7 @@ SYM_DATA(smpboot_control,		.long 0)
 SYM_DATA(phys_base, .quad 0x0)
 EXPORT_SYMBOL(phys_base)
 
-#include "../../x86/xen/xen-head.S"
+#include "../xen/xen-head.S"
 
 	__PAGE_ALIGNED_BSS
 SYM_DATA_START_PAGE_ALIGNED(empty_zero_page)

arch/x86/kernel/rtc.c

@@ -10,7 +10,6 @@
 #include <asm/vsyscall.h>
 #include <asm/x86_init.h>
 #include <asm/time.h>
-#include <asm/intel-mid.h>
 #include <asm/setup.h>
 
 #ifdef CONFIG_X86_32

arch/x86/kernel/signal_32.c

@@ -34,7 +34,7 @@
 #include <asm/gsseg.h>
 
 #ifdef CONFIG_IA32_EMULATION
-#include <asm/ia32_unistd.h>
+#include <asm/unistd_32_ia32.h>
 
 static inline void reload_segments(struct sigcontext_32 *sc)
 {

arch/x86/math-emu/fpu_etc.c

@@ -120,9 +120,14 @@ static void fxam(FPU_REG *st0_ptr, u_char st0tag)
 	setcc(c);
 }
 
+static void FPU_ST0_illegal(FPU_REG *st0_ptr, u_char st0_tag)
+{
+	FPU_illegal();
+}
+
 static FUNC_ST0 const fp_etc_table[] = {
-	fchs, fabs, (FUNC_ST0) FPU_illegal, (FUNC_ST0) FPU_illegal,
-	ftst_, fxam, (FUNC_ST0) FPU_illegal, (FUNC_ST0) FPU_illegal
+	fchs, fabs, FPU_ST0_illegal, FPU_ST0_illegal,
+	ftst_, fxam, FPU_ST0_illegal, FPU_ST0_illegal,
 };
 
 void FPU_etc(void)

arch/x86/math-emu/fpu_trig.c

@@ -433,13 +433,13 @@ static void fxtract(FPU_REG *st0_ptr, u_char st0_tag)
 #endif /* PARANOID */
 }
 
-static void fdecstp(void)
+static void fdecstp(FPU_REG *st0_ptr, u_char st0_tag)
 {
 	clear_C1();
 	top--;
 }
 
-static void fincstp(void)
+static void fincstp(FPU_REG *st0_ptr, u_char st0_tag)
 {
 	clear_C1();
 	top++;
@@ -1631,7 +1631,7 @@ static void fscale(FPU_REG *st0_ptr, u_char st0_tag)
 
 static FUNC_ST0 const trig_table_a[] = {
 	f2xm1, fyl2x, fptan, fpatan,
-	fxtract, fprem1, (FUNC_ST0) fdecstp, (FUNC_ST0) fincstp
+	fxtract, fprem1, fdecstp, fincstp,
 };
 
 void FPU_triga(void)

arch/x86/math-emu/reg_constant.c

@@ -108,8 +108,13 @@ static void fldz(int rc)
 
 typedef void (*FUNC_RC) (int);
 
+static void FPU_RC_illegal(int unused)
+{
+	FPU_illegal();
+}
+
 static FUNC_RC constants_table[] = {
-	fld1, fldl2t, fldl2e, fldpi, fldlg2, fldln2, fldz, (FUNC_RC) FPU_illegal
+	fld1, fldl2t, fldl2e, fldpi, fldlg2, fldln2, fldz, FPU_RC_illegal
 };
 
 void fconst(void)

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:

arch/x86/pci/ce4100.c

@@ -35,12 +35,6 @@ struct sim_dev_reg {
 	struct sim_reg sim_reg;
 };
 
-struct sim_reg_op {
-	void (*init)(struct sim_dev_reg *reg);
-	void (*read)(struct sim_dev_reg *reg, u32 value);
-	void (*write)(struct sim_dev_reg *reg, u32 value);
-};
-
 #define MB (1024 * 1024)
 #define KB (1024)
 #define SIZE_TO_MASK(size) (~(size - 1))

arch/x86/virt/vmx/tdx/tdx.c

@@ -27,7 +27,6 @@
 #include <linux/log2.h>
 #include <linux/acpi.h>
 #include <linux/suspend.h>
-#include <linux/acpi.h>
 #include <asm/page.h>
 #include <asm/special_insns.h>
 #include <asm/msr-index.h>

arch/x86/xen/enlighten.c

 // SPDX-License-Identifier: GPL-2.0
 
-#ifdef CONFIG_XEN_BALLOON_MEMORY_HOTPLUG
-#include <linux/memblock.h>
-#endif
 #include <linux/console.h>
 #include <linux/cpu.h>
 #include <linux/kexec.h>