Commit bd9a8542 authored by Yosry Ahmed's avatar Yosry Ahmed Committed by Ingo Molnar
Browse files

x86/bugs: Remove the X86_FEATURE_USE_IBPB check in ib_prctl_set() 



If X86_FEATURE_USE_IBPB is not set, then both spectre_v2_user_ibpb and
spectre_v2_user_stibp are set to SPECTRE_V2_USER_NONE in
spectre_v2_user_select_mitigation(). Since ib_prctl_set() already checks
for this before performing the IBPB, the X86_FEATURE_USE_IBPB check is
redundant. Remove it.

Signed-off-by: default avatarYosry Ahmed <yosry.ahmed@linux.dev>
Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
Acked-by: default avatarJosh Poimboeuf <jpoimboe@kernel.org>
Link: https://lore.kernel.org/r/20250227012712.3193063-4-yosry.ahmed@linux.dev
parent a48dc426

arch/x86/kernel/cpu/bugs.c

+1 −1
Original line number Diff line number Diff line
@@ -2272,7 +2272,7 @@ static int ib_prctl_set(struct task_struct *task, unsigned long ctrl) 
		if (ctrl == PR_SPEC_FORCE_DISABLE)

			task_set_spec_ib_force_disable(task);

		task_update_spec_tif(task);

		if (task == current && cpu_feature_enabled(X86_FEATURE_USE_IBPB))

		if (task == current)

			indirect_branch_prediction_barrier();

		break;

	default: