ARCH_PHYS_WC_ADD(9) Hardware Interfaces ARCH_PHYS_WC_ADD(9)
NAME arch_phys_wc_add - add a WC MTRR and handle errors if PAT is unavailable
SYNOPSIS int arch_phys_wc_add(unsigned long base, unsigned long size);
ARGUMENTS base Physical base address
size Size of region
DESCRIPTION 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.
COPYRIGHT Kernel Hackers Manual 2.6. April 2016 ARCH_PHYS_WC_ADD(9)