• Geert Uytterhoeven's avatar
    ARM: 8338/1: kexec: Relax SMP validation to improve DT compatibility · fee3fd4f
    Geert Uytterhoeven authored
    When trying to kexec into a new kernel on a platform where multiple CPU
    cores are present, but no SMP bringup code is available yet, the
    kexec_load system call fails with:
    
        kexec_load failed: Invalid argument
    
    The SMP test added to machine_kexec_prepare() in commit 2103f6cb
    ("ARM: 7807/1: kexec: validate CPU hotplug support") wants to prohibit
    kexec on SMP platforms where it cannot disable secondary CPUs.
    However, this test is too strict: if the secondary CPUs couldn't be
    enabled in the first place, there's no need to disable them later at
    kexec time.  Hence skip the test in the absence of SMP bringup code.
    
    This allows to add all CPU cores to the DTS from the beginning, without
    having to implement SMP bringup first, improving DT compatibility.
    Signed-off-by: default avatarGeert Uytterhoeven <geert+renesas@glider.be>
    Acked-by: default avatarStephen Warren <swarren@nvidia.com>
    Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
    fee3fd4f
machine_kexec.c 4.93 KB