• Alexander Lobakin's avatar
    MIPS: make CPU_HAS_LOAD_STORE_LR opt-out · 18d84e2e
    Alexander Lobakin authored
    CPU_HAS_LOAD_STORE_LR was introduced in 932afdee ("MIPS: Add Kconfig
    variable for CPUs with unaligned load/store instructions") to make code
    in kernel/unaligned.c and lib/mem{cpy,set}.S more intuitive and give a
    possibility to easily add new CPUs without these instruction sets in
    future.
    
    Hovewer, this variant is not optimal for mainly two reasons:
    * For now, we have 20+ CPUs with such instructions and only two (MIPS R6)
      without. It will obviously be more effective and straightforward to
      have an option for these two rather than for the rest.
    * You can easily miss the fact that you need to select this option when
      adding a new CPU, while all processors lacking these sets are
      well-known, so the probability of missing something is way much lower.
    
    We can address both points by turning CPU_HAS_LOAD_STORE_LR into opt-out
    CPU_NO_LOAD_STORE_LR. This also makes MIPS root Kconfig more clear and
    understandable.
    Signed-off-by: default avatarAlexander Lobakin <alobakin@dlink.ru>
    Signed-off-by: default avatarPaul Burton <paulburton@kernel.org>
    Cc: Ralf Baechle <ralf@linux-mips.org>
    Cc: Alexandre Belloni <alexandre.belloni@bootlin.com>
    Cc: Microchip Linux Driver Support <UNGLinuxDriver@microchip.com>
    Cc: Will Deacon <will@kernel.org>
    Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
    Cc: Paul Walmsley <paul.walmsley@sifive.com>
    Cc: Michal Simek <michal.simek@xilinx.com>
    Cc: Allison Randal <allison@lohutok.net>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: Eric W. Biederman <ebiederm@xmission.com>
    Cc: linux-mips@vger.kernel.org
    Cc: linux-kernel@vger.kernel.org
    18d84e2e
memset.S 7.56 KB