x86, perf, bts, mm: Delete the never used BTS-ptrace code

Support for the PMU's BTS features has been upstreamed in
v2.6.32, but we still have the old and disabled ptrace-BTS,
as Linus noticed it not so long ago.

It's buggy: TIF_DEBUGCTLMSR is trampling all over that MSR without
regard for other uses (perf) and doesn't provide the flexibility
needed for perf either.

Its users are ptrace-block-step and ptrace-bts, since ptrace-bts
was never used and ptrace-block-step can be implemented using a
much simpler approach.

So axe all 3000 lines of it. That includes the *locked_memory*()
APIs in mm/mlock.c as well.

Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Roland McGrath <roland@redhat.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Markus Metzger <markus.t.metzger@intel.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
LKML-Reference: <20100325135413.938004390@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 0 insertions, 20 deletions

diff --git a/arch/x86/Kconfig.cpu b/arch/x86/Kconfig.cpu
index a19829374e6a..918fbb1855cc 100644
--- a/arch/x86/Kconfig.cpu
+++ b/arch/x86/Kconfig.cpu
@@ -502,23 +502,3 @@ config CPU_SUP_UMC_32
           CPU might render the kernel unbootable.
 
           If unsure, say N.
-
-config X86_DS
-        def_bool X86_PTRACE_BTS
-        depends on X86_DEBUGCTLMSR
-        select HAVE_HW_BRANCH_TRACER
-
-config X86_PTRACE_BTS
-        bool "Branch Trace Store"
-        default y
-        depends on X86_DEBUGCTLMSR
-        depends on BROKEN
-        ---help---
-          This adds a ptrace interface to the hardware's branch trace store.
-
-          Debuggers may use it to collect an execution trace of the debugged
-          application in order to answer the question 'how did I get here?'.
-          Debuggers may trace user mode as well as kernel mode.
-
-          Say Y unless there is no application development on this machine
-          and you want to save a small amount of code size.