riscv: extable: make fixup_exception() return bool

The return values of fixup_exception() and riscv_bpf_fixup_exception()
represent a boolean condition rather than an error code, so it's better
to return `bool` rather than `int`.
Signed-off-by: Jisheng Zhang <jszhang@kernel.org>
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>

arch/riscv/include/asm/extable.h

@@ -21,16 +21,16 @@ struct exception_table_entry {
 
 #define ARCH_HAS_RELATIVE_EXTABLE
 
-int fixup_exception(struct pt_regs *regs);
+bool 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);
+bool rv_bpf_fixup_exception(const struct exception_table_entry *ex, struct pt_regs *regs);
 #else
-static inline int
+static inline bool
 rv_bpf_fixup_exception(const struct exception_table_entry *ex,
 		       struct pt_regs *regs)
 {
-	return 0;
+	return false;
 }
 #endif
 

arch/riscv/mm/extable.c

@@ -11,17 +11,17 @@
 #include <linux/module.h>
 #include <linux/uaccess.h>
 
-int fixup_exception(struct pt_regs *regs)
+bool fixup_exception(struct pt_regs *regs)
 {
 	const struct exception_table_entry *fixup;
 
 	fixup = search_exception_tables(regs->epc);
 	if (!fixup)
-		return 0;
+		return false;
 
 	if (regs->epc >= BPF_JIT_REGION_START && regs->epc < BPF_JIT_REGION_END)
 		return rv_bpf_fixup_exception(fixup, regs);
 
 	regs->epc = (unsigned long)&fixup->fixup + fixup->fixup;
-	return 1;
+	return true;
 }

arch/riscv/net/bpf_jit_comp64.c

@@ -459,8 +459,8 @@ 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)
+bool rv_bpf_fixup_exception(const struct exception_table_entry *ex,
+			    struct pt_regs *regs)
 {
 	off_t offset = FIELD_GET(BPF_FIXUP_OFFSET_MASK, ex->fixup);
 	int regs_offset = FIELD_GET(BPF_FIXUP_REG_MASK, ex->fixup);
@@ -468,7 +468,7 @@ int rv_bpf_fixup_exception(const struct exception_table_entry *ex,
 	*(unsigned long *)((void *)regs + pt_regmap[regs_offset]) = 0;
 	regs->epc = (unsigned long)&ex->fixup - offset;
 
-	return 1;
+	return true;
 }
 
 /* For accesses to BTF pointers, add an entry to the exception table */