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x86: Convert unreachable() to BUG()

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Avoid unreachable() as it can (and will in the absence of UBSAN)
generate fallthrough code. Use BUG() so we get a UD2 trap (with
unreachable annotation).

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Josh Poimboeuf <jpoimboe@kernel.org>
Link: https://lore.kernel.org/r/20241128094312.028316261@infradead.org
This commit is contained in:
Peter Zijlstra 2024-11-28 10:39:02 +01:00
parent c837de3810
commit 2190966fbc
3 changed files with 3 additions and 3 deletions
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2
arch/x86/kernel/process.c
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@ -838,7 +838,7 @@ void __noreturn stop_this_cpu(void *dummy)
#ifdef CONFIG_SMP
if (smp_ops.stop_this_cpu) {
smp_ops.stop_this_cpu();
unreachable();
BUG();
}
#endif

2
arch/x86/kernel/reboot.c
View File

@ -883,7 +883,7 @@ static int crash_nmi_callback(unsigned int val, struct pt_regs *regs)
if (smp_ops.stop_this_cpu) {
smp_ops.stop_this_cpu();
unreachable();
BUG();
}
/* Assume hlt works */

2
arch/x86/kvm/svm/sev.c
View File

@ -3820,7 +3820,7 @@ static int snp_begin_psc(struct vcpu_svm *svm, struct psc_buffer *psc)
goto next_range;
}
unreachable();
BUG();
}
static int __sev_snp_update_protected_guest_state(struct kvm_vcpu *vcpu)