• Helge Deller's avatar
    parisc: Detect QEMU earlier in boot process · d006e95b
    Helge Deller authored
    While adding LASI support to QEMU, I noticed that the QEMU detection in
    the kernel happens much too late. For example, when a LASI chip is found
    by the kernel, it registers the LASI LED driver as well.  But when we
    run on QEMU it makes sense to avoid spending unnecessary CPU cycles, so
    we need to access the running_on_QEMU flag earlier than before.
    
    This patch now makes the QEMU detection the fist task of the Linux
    kernel by moving it to where the kernel enters the C-coding.
    
    Fixes: 310d8278 ("parisc: qemu idle sleep support")
    Signed-off-by: default avatarHelge Deller <deller@gmx.de>
    Cc: stable@vger.kernel.org # v4.14+
    d006e95b
setup.c 10.5 KB