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If this option is selected for another vendor, print a warning and fall back to the AUTO option. Signed-off-by: David Kaplan --- arch/x86/kernel/cpu/bugs.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c index 72e04938fdcb..84d3f6b3d1eb 100644 --- a/arch/x86/kernel/cpu/bugs.c +++ b/arch/x86/kernel/cpu/bugs.c @@ -1187,6 +1187,10 @@ static void __init retbleed_select_mitigation(void) case RETBLEED_CMD_STUFF: if (IS_ENABLED(CONFIG_MITIGATION_CALL_DEPTH_TRACKING) && spectre_v2_enabled =3D=3D SPECTRE_V2_RETPOLINE) { + if (boot_cpu_data.x86_vendor !=3D X86_VENDOR_INTEL) { + pr_err("WARNING: retbleed=3Dstuff only supported for Intel CPUs.\n"); + goto do_cmd_auto; + } retbleed_mitigation =3D RETBLEED_MITIGATION_STUFF; =20 } else { --=20 2.34.1