tree 7e1ab105022a571facd81b7fd8040b96e58d73af
parent 2eccd6f65a0d4844318b1e30755cafd063833908
author Roland McGrath <roland@redhat.com> 1207257535 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1207262563 -0700

x86 ptrace: avoid unnecessary wrmsr

This avoids using wrmsr on MSR_IA32_DEBUGCTLMSR when it's not needed.
No wrmsr ever needs to be done if noone has ever used block stepping.

Without this change, using ptrace on 2.6.25 on an x86 KVM guest
will tickle KVM's missing support for the MSR and crash the guest
kernel.  Though host KVM is the buggy one, this makes for a regression
in the guest behavior from 2.6.24->2.6.25 that we can easily avoid.

I also corrected some bad whitespace.

Signed-off-by: Roland McGrath <roland@redhat.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>