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Linux kernel 4.17 introduced two new mmap flags, MAP_FIXED_NOREPLACE and MAP_SHARED_VALIDATE. Starting with QEMU 8.1, these flags are now used and required for proper system operation. In order to build and run on a system older then 4.17, we need to emulate this new behavior. Not having a newer kernel could result in the mmap memory being allocated in a way that will cause failures without QEMU checking for these conditions. Note, memory allocation issues are rare in my experience so this is more of a 'just-in-case' behavior. SDK_OLDEST_KERNEL is currently set to 3.2.0, the only way this can claim that qemu works in an SDK is by checking the return values to emulate the expected behavior. (From OE-Core rev: 4eb0a83c7851e2eb6d7890a130dfe50f37ff8ac9) Signed-off-by: Mark Hatle <mark.hatle@amd.com> Signed-off-by: Mark Hatle <mark.hatle@kernel.crashing.org> Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>