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Subject-rt x86_64 fix for latency tracing
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Ingo/Steve,

The included patch fixes a bug that causes a segfault in the init
thread when latency tracing is enabled on x86_64 kernels. Not sure if
it's completely correct, but it gets me past my segfault and lets me
complete booting.

diff --git a/arch/x86_64/kernel/entry.S b/arch/x86_64/kernel/entry.S
index 066497a..b124409 100644
- --- a/arch/x86_64/kernel/entry.S
+++ b/arch/x86_64/kernel/entry.S
@@ -1089,7 +1089,7 @@ ENTRY(mcount)

mov 0x0(%rbp),%rax
mov 0x8(%rbp),%rdi
- - mov 0x8(%rax),%rsi
+ mov 0x10(%rax),%rsi

call __trace

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