riscv: bpf: move rv_bpf_fixup_exception signature to extable.h

This is to group riscv related extable related functions signature
into one file.
Signed-off-by: Jisheng Zhang <jszhang@kernel.org>
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>

arch/riscv/include/asm/extable.h

@@ -22,4 +22,16 @@ struct exception_table_entry {
 #define ARCH_HAS_RELATIVE_EXTABLE
 
 int fixup_exception(struct pt_regs *regs);
+
+#if defined(CONFIG_BPF_JIT) && defined(CONFIG_ARCH_RV64I)
+int rv_bpf_fixup_exception(const struct exception_table_entry *ex, struct pt_regs *regs);
+#else
+static inline int
+rv_bpf_fixup_exception(const struct exception_table_entry *ex,
+		       struct pt_regs *regs)
+{
+	return 0;
+}
+#endif
+
 #endif

arch/riscv/mm/extable.c

@@ -11,10 +11,6 @@
 #include <linux/module.h>
 #include <linux/uaccess.h>
 
-#if defined(CONFIG_BPF_JIT) && defined(CONFIG_ARCH_RV64I)
-int rv_bpf_fixup_exception(const struct exception_table_entry *ex, struct pt_regs *regs);
-#endif
-
 int fixup_exception(struct pt_regs *regs)
 {
 	const struct exception_table_entry *fixup;
@@ -23,10 +19,8 @@ int fixup_exception(struct pt_regs *regs)
 	if (!fixup)
 		return 0;
 
-#if defined(CONFIG_BPF_JIT) && defined(CONFIG_ARCH_RV64I)
 	if (regs->epc >= BPF_JIT_REGION_START && regs->epc < BPF_JIT_REGION_END)
 		return rv_bpf_fixup_exception(fixup, regs);
-#endif
 
 	regs->epc = (unsigned long)&fixup->fixup + fixup->fixup;
 	return 1;

arch/riscv/net/bpf_jit_comp64.c

@@ -459,8 +459,6 @@ static int emit_call(bool fixed, u64 addr, struct rv_jit_context *ctx)
 #define BPF_FIXUP_OFFSET_MASK   GENMASK(26, 0)
 #define BPF_FIXUP_REG_MASK      GENMASK(31, 27)
 
-int rv_bpf_fixup_exception(const struct exception_table_entry *ex,
-				struct pt_regs *regs);
 int rv_bpf_fixup_exception(const struct exception_table_entry *ex,
 				struct pt_regs *regs)
 {