From 3047e99ede366298c6233d1870d12a520d4d92f3 Mon Sep 17 00:00:00 2001 From: Ingo Molnar Date: Mon, 3 Jul 2006 00:24:57 -0700 Subject: [PATCH] lockdep: x86 smp alternatives workaround Disable SMP alternatives fixups (the patching in of NOPs on 1-CPU systems) if the lock validator is enabled: there is a binutils section handling bug that causes corrupted instructions when UP instructions are patched in. Signed-off-by: Ingo Molnar Signed-off-by: Arjan van de Ven Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/i386/kernel/alternative.c | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'arch') diff --git a/arch/i386/kernel/alternative.c b/arch/i386/kernel/alternative.c index 7b421b3a053e..28ab80649764 100644 --- a/arch/i386/kernel/alternative.c +++ b/arch/i386/kernel/alternative.c @@ -303,6 +303,16 @@ void alternatives_smp_switch(int smp) struct smp_alt_module *mod; unsigned long flags; +#ifdef CONFIG_LOCKDEP + /* + * A not yet fixed binutils section handling bug prevents + * alternatives-replacement from working reliably, so turn + * it off: + */ + printk("lockdep: not fixing up alternatives.\n"); + return; +#endif + if (no_replacement || smp_alt_once) return; BUG_ON(!smp && (num_online_cpus() > 1)); -- cgit v1.2.3