The following commit has been merged into the x86/bugs branch of tip:
Commit-ID: 0a0ce0da7fe66d54e497fb4e97d101b478f57e00
Gitweb: https://git.kernel.org/tip/0a0ce0da7fe66d54e497fb4e97d101b478f57e00
Author: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
AuthorDate: Mon, 04 Sep 2023 22:04:58 -07:00
Committer: Borislav Petkov (AMD) <bp@xxxxxxxxx>
CommitterDate: Fri, 20 Oct 2023 12:28:44 +02:00
x86/bugs: Remove default case for fully switched enums
For enum switch statements which handle all possible cases, remove the
default case so a compiler warning gets printed if one of the enums gets
accidentally omitted from the switch statement.
Signed-off-by: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Signed-off-by: Borislav Petkov (AMD) <bp@xxxxxxxxx>
Acked-by: Borislav Petkov (AMD) <bp@xxxxxxxxx>
Link: https://lore.kernel.org/r/fcf6feefab991b72e411c2aed688b18e65e06aed.1693889988.git.jpoimboe@xxxxxxxxxx
---
arch/x86/kernel/cpu/bugs.c | 17 +++++++----------
1 file changed, 7 insertions(+), 10 deletions(-)
diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c
index 4f1ad23..941ac94 100644
--- a/arch/x86/kernel/cpu/bugs.c
+++ b/arch/x86/kernel/cpu/bugs.c
@@ -1019,7 +1019,6 @@ static void __init retbleed_select_mitigation(void)
do_cmd_auto:
case RETBLEED_CMD_AUTO:
- default:
if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD ||
boot_cpu_data.x86_vendor == X86_VENDOR_HYGON) {
if (IS_ENABLED(CONFIG_CPU_UNRET_ENTRY))
@@ -1290,6 +1289,8 @@ spectre_v2_user_select_mitigation(void)
spectre_v2_user_ibpb = mode;
switch (cmd) {
+ case SPECTRE_V2_USER_CMD_NONE:
+ break;
case SPECTRE_V2_USER_CMD_FORCE:
case SPECTRE_V2_USER_CMD_PRCTL_IBPB:
case SPECTRE_V2_USER_CMD_SECCOMP_IBPB:
@@ -1301,8 +1302,6 @@ spectre_v2_user_select_mitigation(void)
case SPECTRE_V2_USER_CMD_SECCOMP:
static_branch_enable(&switch_mm_cond_ibpb);
break;
- default:
- break;
}
pr_info("mitigation: Enabling %s Indirect Branch Prediction Barrier\n",
@@ -2160,6 +2159,10 @@ static int l1d_flush_prctl_get(struct task_struct *task)
static int ssb_prctl_get(struct task_struct *task)
{
switch (ssb_mode) {
+ case SPEC_STORE_BYPASS_NONE:
+ if (boot_cpu_has_bug(X86_BUG_SPEC_STORE_BYPASS))
+ return PR_SPEC_ENABLE;
+ return PR_SPEC_NOT_AFFECTED;
case SPEC_STORE_BYPASS_DISABLE:
return PR_SPEC_DISABLE;
case SPEC_STORE_BYPASS_SECCOMP:
@@ -2171,11 +2174,8 @@ static int ssb_prctl_get(struct task_struct *task)
if (task_spec_ssb_disable(task))
return PR_SPEC_PRCTL | PR_SPEC_DISABLE;
return PR_SPEC_PRCTL | PR_SPEC_ENABLE;
- default:
- if (boot_cpu_has_bug(X86_BUG_SPEC_STORE_BYPASS))
- return PR_SPEC_ENABLE;
- return PR_SPEC_NOT_AFFECTED;
}
+ BUG();
}
static int ib_prctl_get(struct task_struct *task)
@@ -2504,9 +2504,6 @@ static void __init srso_select_mitigation(void)
pr_err("WARNING: kernel not compiled with CPU_SRSO.\n");
}
break;
-
- default:
- break;
}
out:
|