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authorIngo Molnar <>2008-12-24 10:49:51 +0100
committerIngo Molnar <>2008-12-24 10:49:51 +0100
commit40f15ad8aadff5ebb621b17a6f303ad2cd3f847d (patch)
parent280a9ca5d0663b185ddc4443052076c29652a328 (diff)
x86: disable X86_PTRACE_BTS
there's a new ptrace arch level feature in .28: config X86_PTRACE_BTS bool "Branch Trace Store" it has broken fork() handling: the old DS area gets copied over into a new task without clearing it. Fixes exist but they came too late: c5dee61: x86, bts: memory accounting bf53de9: x86, bts: add fork and exit handling and are queued up for v2.6.29. This shows that the facility is still not tested well enough to release into a stable kernel - disable it for now and reactivate in .29. In .29 the hardware-branch-tracer will use the DS/BTS facilities too - hopefully resulting in better code. Signed-off-by: Ingo Molnar <>
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/Kconfig.cpu b/arch/x86/Kconfig.cpu
index b815664fe370..8e99073b9e0f 100644
--- a/arch/x86/Kconfig.cpu
+++ b/arch/x86/Kconfig.cpu
@@ -520,6 +520,7 @@ config X86_PTRACE_BTS
bool "Branch Trace Store"
default y
depends on X86_DEBUGCTLMSR
+ depends on BROKEN
This adds a ptrace interface to the hardware's branch trace store.