• Kees Cook's avatar
    pstore/ram: Introduce max_reason and convert dump_oops · 791205e3
    Kees Cook authored
    Now that pstore_register() can correctly pass max_reason to the kmesg
    dump facility, introduce a new "max_reason" module parameter and
    "max-reason" Device Tree field.
    
    The "dump_oops" module parameter and "dump-oops" Device
    Tree field are now considered deprecated, but are now automatically
    converted to their corresponding max_reason values when present, though
    the new max_reason setting has precedence.
    
    For struct ramoops_platform_data, the "dump_oops" member is entirely
    replaced by a new "max_reason" member, with the only existing user
    updated in place.
    
    Additionally remove the "reason" filter logic from ramoops_pstore_write(),
    as that is not specifically needed anymore, though technically
    this is a change in behavior for any ramoops users also setting the
    printk.always_kmsg_dump boot param, which will cause ramoops to behave as
    if max_reason was set to KMSG_DUMP_MAX.
    Co-developed-by: default avatarPavel Tatashin <pasha.tatashin@soleen.com>
    Signed-off-by: default avatarPavel Tatashin <pasha.tatashin@soleen.com>
    Link: https://lore.kernel.org/lkml/20200515184434.8470-6-keescook@chromium.org/Signed-off-by: default avatarKees Cook <keescook@chromium.org>
    791205e3
ramoops.rst 6.1 KB