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| author | Jan Beulich <jbeulich@novell.com> | 2008-03-10 16:11:17 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-04-17 19:40:58 +0400 |
| commit | 5b0e508415a83989fe704b4718a1a214bc333ca7 (patch) | |
| tree | bf73f1e6b944c190441413cedfb49b05e04ffe6b /arch/x86/mm/pgtable_32.c | |
| parent | f694010185c429629ad5a65245da08103e611852 (diff) | |
| download | linux-5b0e508415a83989fe704b4718a1a214bc333ca7.tar.xz | |
x86: prevent unconditional writes to DebugCtl MSR
Otherwise, enabling (or better, subsequent disabling) of single
stepping would cause a kernel oops on CPUs not having this MSR.
The patch could have been added a conditional to the MSR write in
user_disable_single_step(), but centralizing the updates seems safer
and (looking forward) better manageable.
Signed-off-by: Jan Beulich <jbeulich@novell.com>
Cc: Markus Metzger <markus.t.metzger@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/mm/pgtable_32.c')
0 files changed, 0 insertions, 0 deletions