• Catalin Marinas's avatar
    arm64: Clean up the default pgprot setting · a501e324
    Catalin Marinas authored
    The primary aim of this patchset is to remove the pgprot_default and
    prot_sect_default global variables and rely strictly on predefined
    values. The original goal was to be able to run SMP kernels on UP
    hardware by not setting the Shareability bit. However, it is unlikely to
    see UP ARMv8 hardware and even if we do, the Shareability bit is no
    longer assumed to disable cacheable accesses.
    A side effect is that the device mappings now have the Shareability
    attribute set. The hardware, however, should ignore it since Device
    accesses are always Outer Shareable.
    Following the removal of the two global variables, there is some PROT_*
    macro reshuffling and cleanup, including the __PAGE_* macros (replaced
    by PAGE_*).
    Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
    Acked-by: default avatarWill Deacon <will.deacon@arm.com>
setup.c 12.2 KB