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62ec8e470d
Integrating the latest 4.19-rt to the preempt-rt branches, the -rt
release announcements summarize the changes:
Changes since v4.19.25-rt15:
- The "preserve task state" change in cpu_chill() in the previous
release is responsible for missing a wake up. Reported by Mike
Galbraith.
- The x86-32 lazy preempt code was broken. Reported by Andri Yngvason.
Changes since v4.19.23-rt13:
- Use the specified preempt mask in should_resched() on x86. Otherwise
a scheduling opportunity of non RT tasks could be missed.
- Preserve the task state in cpu_chill()
- Add two more cases to consider before warning about pending
softirqs.
(From OE-Core rev: 3efbde7738efd3b69f86d4cb4b08e4e11190f75d)
Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
QEMU Emulation Targets ====================== To simplify development, the build system supports building images to work with the QEMU emulator in system emulation mode. Several architectures are currently supported in 32 and 64 bit variants: * ARM (qemuarm + qemuarm64) * x86 (qemux86 + qemux86-64) * PowerPC (qemuppc only) * MIPS (qemumips + qemumips64) Use of the QEMU images is covered in the Yocto Project Reference Manual. The appropriate MACHINE variable value corresponding to the target is given in brackets.