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Paul Gortmaker sent along the following fixup for 4.19-rt: [ Author: Paul Gortmaker <paul.gortmaker@windriver.com> Date: Mon Apr 15 12:01:31 2019 -0400 Revert "mm: handle lru_add_drain_all for UP properly" This reverts commit e6e9d6e290028b0a6b83b563fad9fafa7f1d515e. It was a 4.19.31 backport of commit 6ea183d60c46 ("mm: handle lru_add_drain_all for UP properly"). In summary, what that did was to fix a possible harmless WARN_ON on non-SMP, introduced at commit 4d43d395fed1 ("workqueue: Try to catch flush_work() without INIT_WORK().") by adding non-SMP variants of lru functions. The combination of that, with the -rt commit 473f14a9f234 ("mm: perform lru_add_drain_all() remotely") at the merge of the two results in the following build failure: mm/swap.c:736:2: error: #endif without #if since the -rt change wants RT specific lru and the stable backport wants non-SMP specific lru, and a chunk of the backport with an #ifdef CONFIG_SMP is missing. However, before we add a four way cluster of ifdeffery to handle all cases, we note 4d43d395fed1 was added to the v5.1 release, and it was not (currently) backported to any 4.19.x stable release - so it is unclear to me why this commit was ever backported to 4.19.31 at all. Further, we note this change was to mm/swap.c -- and by definition, any preempt-rt deployment that uses swap for anything other than a failure contingency mitigation is broken by design. Given all that, I decided that the best path forward was to revert the two of the three chunks of the backport that remain in the -rt branch, and return us to the pre-4.19.31 merge behaviour for -rt. Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> ] (From OE-Core rev: dfe57d439559cc7d1d662a64f0040cd176c1afa7) Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> 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.