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>
diff --git a/arch/x86/include/asm/ptrace-abi.h b/arch/x86/include/asm/ptrace-abi.h
index 8672303..52b098a 100644
--- a/arch/x86/include/asm/ptrace-abi.h
+++ b/arch/x86/include/asm/ptrace-abi.h
@@ -82,61 +82,6 @@
#ifndef __ASSEMBLY__
#include <linux/types.h>
-
-/* configuration/status structure used in PTRACE_BTS_CONFIG and
- PTRACE_BTS_STATUS commands.
-*/
-struct ptrace_bts_config {
- /* requested or actual size of BTS buffer in bytes */
- __u32 size;
- /* bitmask of below flags */
- __u32 flags;
- /* buffer overflow signal */
- __u32 signal;
- /* actual size of bts_struct in bytes */
- __u32 bts_size;
-};
-#endif /* __ASSEMBLY__ */
-
-#define PTRACE_BTS_O_TRACE 0x1 /* branch trace */
-#define PTRACE_BTS_O_SCHED 0x2 /* scheduling events w/ jiffies */
-#define PTRACE_BTS_O_SIGNAL 0x4 /* send SIG<signal> on buffer overflow
- instead of wrapping around */
-#define PTRACE_BTS_O_ALLOC 0x8 /* (re)allocate buffer */
-
-#define PTRACE_BTS_CONFIG 40
-/* Configure branch trace recording.
- ADDR points to a struct ptrace_bts_config.
- DATA gives the size of that buffer.
- A new buffer is allocated, if requested in the flags.
- An overflow signal may only be requested for new buffers.
- Returns the number of bytes read.
-*/
-#define PTRACE_BTS_STATUS 41
-/* Return the current configuration in a struct ptrace_bts_config
- pointed to by ADDR; DATA gives the size of that buffer.
- Returns the number of bytes written.
-*/
-#define PTRACE_BTS_SIZE 42
-/* Return the number of available BTS records for draining.
- DATA and ADDR are ignored.
-*/
-#define PTRACE_BTS_GET 43
-/* Get a single BTS record.
- DATA defines the index into the BTS array, where 0 is the newest
- entry, and higher indices refer to older entries.
- ADDR is pointing to struct bts_struct (see asm/ds.h).
-*/
-#define PTRACE_BTS_CLEAR 44
-/* Clear the BTS buffer.
- DATA and ADDR are ignored.
-*/
-#define PTRACE_BTS_DRAIN 45
-/* Read all available BTS records and clear the buffer.
- ADDR points to an array of struct bts_struct.
- DATA gives the size of that buffer.
- BTS records are read from oldest to newest.
- Returns number of BTS records drained.
-*/
+#endif
#endif /* _ASM_X86_PTRACE_ABI_H */