On Tue, Apr 16, 2019 at 03:50:16PM +0200, Helge Deller wrote:
Hi Greg,
please do NOT apply this patch to the 4.9 tree. See below, it was tagged for v4.14+ only.
Yes, but I added it to 4.9 because:
commit d006e95b5561f708d0385e9677ffe2c46f2ae345 upstream.
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: 310d82784fb4 ("parisc: qemu idle sleep support")
This commit is in 4.9.76. So why wouldn't it be valid in 4.9.y (with the exception of the fact that it doesn't build...)?
thanks,
greg k-h