arm64: probes: Remove probe_opcode_t

The probe_opcode_t typedef for u32 isn't necessary, and is a source of
confusion as it is easily confused with kprobe_opcode_t, which is a
typedef for __le32.

The typedef is only used within arch/arm64, and all of arm64's commn
insn code uses u32 for the endian-agnostic value of an instruction, so
it'd be clearer to use u32 consistently.

Remove probe_opcode_t and use u32 directly.

There should be no functional change as a result of this patch.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Catalin Marinas <catalin.marnias@arm.com>
Cc: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20241008155851.801546-7-mark.rutland@arm.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

Author: mrutland-arm

arch/arm64/include/asm/probes.h

@@ -9,7 +9,6 @@
 
 #include <asm/insn.h>
 
-typedef u32 probe_opcode_t;
 typedef void (probes_handler_t) (u32 opcode, long addr, struct pt_regs *);
 
 struct arch_probe_insn {

arch/arm64/kernel/probes/decode-insn.c

@@ -73,7 +73,7 @@ static bool __kprobes aarch64_insn_is_steppable(u32 insn)
  *   INSN_GOOD_NO_SLOT If instruction is supported but doesn't use its slot.
  */
 enum probe_insn __kprobes
-arm_probe_decode_insn(probe_opcode_t insn, struct arch_probe_insn *api)
+arm_probe_decode_insn(u32 insn, struct arch_probe_insn *api)
 {
 	/*
 	 * Instructions reading or modifying the PC won't work from the XOL
@@ -133,7 +133,7 @@ enum probe_insn __kprobes
 arm_kprobe_decode_insn(kprobe_opcode_t *addr, struct arch_specific_insn *asi)
 {
 	enum probe_insn decoded;
-	probe_opcode_t insn = le32_to_cpu(*addr);
+	u32 insn = le32_to_cpu(*addr);
 	kprobe_opcode_t *scan_end = NULL;
 	unsigned long size = 0, offset = 0;
 	struct arch_probe_insn *api = &asi->api;

arch/arm64/kernel/probes/decode-insn.h

@@ -28,6 +28,6 @@ enum probe_insn __kprobes
 arm_kprobe_decode_insn(kprobe_opcode_t *addr, struct arch_specific_insn *asi);
 #endif
 enum probe_insn __kprobes
-arm_probe_decode_insn(probe_opcode_t insn, struct arch_probe_insn *asi);
+arm_probe_decode_insn(u32 insn, struct arch_probe_insn *asi);
 
 #endif /* _ARM_KERNEL_KPROBES_ARM64_H */

arch/arm64/kernel/probes/uprobes.c

@@ -34,7 +34,7 @@ unsigned long uprobe_get_swbp_addr(struct pt_regs *regs)
 int arch_uprobe_analyze_insn(struct arch_uprobe *auprobe, struct mm_struct *mm,
 		unsigned long addr)
 {
-	probe_opcode_t insn;
+	u32 insn;
 
 	/* TODO: Currently we do not support AARCH32 instruction probing */
 	if (mm->context.flags & MMCF_AARCH32)
@@ -102,7 +102,7 @@ bool arch_uprobe_xol_was_trapped(struct task_struct *t)
 
 bool arch_uprobe_skip_sstep(struct arch_uprobe *auprobe, struct pt_regs *regs)
 {
-	probe_opcode_t insn;
+	u32 insn;
 	unsigned long addr;
 
 	if (!auprobe->simulate)