From: Varun R Mallya <varunrmallya@gmail.com>
Date: Tue, 2 Jun 2026 20:58:46 +0000 (+0530)
Subject: selftests/bpf: use host CPU features in JIT disassembler
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=557d0cc3f2520feba45360beeafb93203b3230e0;p=thirdparty%2Flinux.git

selftests/bpf: use host CPU features in JIT disassembler

Pass the host CPU name and feature string to
LLVMCreateDisasmCPUFeatures() instead of using LLVMCreateDisasm(), so
the disassembler correctly decodes CPU-specific instructions and
extensions such as RISC-V compressed and vector instructions.

Signed-off-by: Varun R Mallya <varunrmallya@gmail.com>
Reviewed-by: Björn Töpel <bjorn@kernel.org>
Link: https://lore.kernel.org/r/20260602205847.102825-2-varunrmallya@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
---

diff --git a/tools/testing/selftests/bpf/jit_disasm_helpers.c b/tools/testing/selftests/bpf/jit_disasm_helpers.c
index 364c557c5115..3558fe10e28c 100644
--- a/tools/testing/selftests/bpf/jit_disasm_helpers.c
+++ b/tools/testing/selftests/bpf/jit_disasm_helpers.c
@@ -96,10 +96,19 @@ static int disasm_one_func(FILE *text_out, uint8_t *image, __u32 len)
 	__u32 *label_pc, pc;
 	int i, cnt, err = 0;
 	char buf[64];
+	char *cpu, *features;
 
 	triple = LLVMGetDefaultTargetTriple();
-	ctx = LLVMCreateDisasm(triple, &labels, 0, NULL, lookup_symbol);
-	if (!ASSERT_OK_PTR(ctx, "LLVMCreateDisasm")) {
+
+	cpu = LLVMGetHostCPUName();
+	features = LLVMGetHostCPUFeatures();
+
+	ctx = LLVMCreateDisasmCPUFeatures(triple, cpu, features, &labels, 0, NULL, lookup_symbol);
+
+	LLVMDisposeMessage(cpu);
+	LLVMDisposeMessage(features);
+
+	if (!ASSERT_OK_PTR(ctx, "LLVMCreateDisasmCPUFeatures")) {
 		err = -EINVAL;
 		goto out;
 	}