arch_phys_wc_add — add a WC MTRR and handle errors if PAT is unavailable
int arch_phys_wc_add ( | unsigned long base, |
unsigned long size); |
If PAT is available, this does nothing. If PAT is unavailable, it attempts to add a WC MTRR covering size bytes starting at base and logs an error if this fails.
Drivers must store the return value to pass to mtrr_del_wc_if_needed, but drivers should not try to interpret that return value.