diff options
Diffstat (limited to 'arch/x86/kernel/msr.c')
| -rw-r--r-- | arch/x86/kernel/msr.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/x86/kernel/msr.c b/arch/x86/kernel/msr.c index 34bdb752f892..eb988df22521 100644 --- a/arch/x86/kernel/msr.c +++ b/arch/x86/kernel/msr.c @@ -13,6 +13,9 @@ * and then read/write in chunks of 8 bytes. A larger size means multiple * reads or writes of the same register. * + * Writing the same register multiple times can be useful for MSRs with + * I/O-like semantics, e.g. a virtual MSR that accepts logging information. + * * This driver uses /dev/cpu/%d/msr where %d is the minor number, and on * an SMP box will direct the access to CPU %d. */ |