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

Browse source 
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 <[email protected]>
Signed-off-by: Peter Zijlstra <[email protected]>
Cc: Roland McGrath <[email protected]>
Cc: Oleg Nesterov <[email protected]>
Cc: Markus Metzger <[email protected]>
Cc: Steven Rostedt <[email protected]>
Cc: Andrew Morton <[email protected]>
LKML-Reference: <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Peter Zijlstra 2010-03-25 14:51:50 +01:00 • committed by Ingo Molnar
commit faa4602e47
34 changed files with 9 additions and 3269 deletions
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41
mm/mlock.c
View file

@ -607,44 +607,3 @@ void user_shm_unlock(size_t size, struct user_struct *user)
spin_unlock(&shmlock_user_lock);
free_uid(user);
}
int account_locked_memory(struct mm_struct *mm, struct rlimit *rlim,
size_t size)
{
unsigned long lim, vm, pgsz;
int error = -ENOMEM;
pgsz = PAGE_ALIGN(size) >> PAGE_SHIFT;
down_write(&mm->mmap_sem);
lim = ACCESS_ONCE(rlim[RLIMIT_AS].rlim_cur) >> PAGE_SHIFT;
vm = mm->total_vm + pgsz;
if (lim < vm)
goto out;
lim = ACCESS_ONCE(rlim[RLIMIT_MEMLOCK].rlim_cur) >> PAGE_SHIFT;
vm = mm->locked_vm + pgsz;
if (lim < vm)
goto out;
mm->total_vm += pgsz;
mm->locked_vm += pgsz;
error = 0;
out:
up_write(&mm->mmap_sem);
return error;
}
void refund_locked_memory(struct mm_struct *mm, size_t size)
{
unsigned long pgsz = PAGE_ALIGN(size) >> PAGE_SHIFT;
down_write(&mm->mmap_sem);
mm->total_vm -= pgsz;
mm->locked_vm -= pgsz;
up_write(&mm->mmap_sem);
}