[PATCH] arm64: bpf: Fix build for !CONFIG_BPF_JIT

[Jean-Philippe Brucker]

Add a stub for arm64_bpf_fixup_exception() when CONFIG_BPF_JIT isn't
enabled, and avoid the fixup in this case.

Signed-off-by: Jean-Philippe Brucker <jean-philippe@xxxxxxxxxx>
---
 arch/arm64/include/asm/extable.h | 9 +++++++++
 arch/arm64/mm/extable.c          | 3 ++-
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/include/asm/extable.h b/arch/arm64/include/asm/extable.h
index bcee40df1586..840a35ed92ec 100644
--- a/arch/arm64/include/asm/extable.h
+++ b/arch/arm64/include/asm/extable.h
@@ -22,8 +22,17 @@ struct exception_table_entry
 
 #define ARCH_HAS_RELATIVE_EXTABLE
 
+#ifdef CONFIG_BPF_JIT
 int arm64_bpf_fixup_exception(const struct exception_table_entry *ex,
 			      struct pt_regs *regs);
+#else /* !CONFIG_BPF_JIT */
+static inline
+int arm64_bpf_fixup_exception(const struct exception_table_entry *ex,
+			      struct pt_regs *regs)
+{
+	return 0;
+}
+#endif /* !CONFIG_BPF_JIT */
 
 extern int fixup_exception(struct pt_regs *regs);
 #endif
diff --git a/arch/arm64/mm/extable.c b/arch/arm64/mm/extable.c
index 1f42991cacdd..eee1732ab6cd 100644
--- a/arch/arm64/mm/extable.c
+++ b/arch/arm64/mm/extable.c
@@ -14,7 +14,8 @@ int fixup_exception(struct pt_regs *regs)
 	if (!fixup)
 		return 0;
 
-	if (regs->pc >= BPF_JIT_REGION_START &&
+	if (IS_ENABLED(CONFIG_BPF_JIT) &&
+	    regs->pc >= BPF_JIT_REGION_START &&
 	    regs->pc < BPF_JIT_REGION_END)
 		return arm64_bpf_fixup_exception(fixup, regs);
 
-- 
2.27.0


--r5Pyd7+fXNt84Ff3--