Commit a957aa57 authored Apr 02, 2019 by Helge Deller Committed by Greg Kroah-Hartman Apr 17, 2019

parisc: Detect QEMU earlier in boot process



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")
Signed-off-by: Helge Deller <deller@gmx.de>
Cc: stable@vger.kernel.org # v4.14+
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent c35bf96a

arch/parisc/kernel/process.c

+0 −6

Original line number	Diff line number	Diff line
		@@ -206,12 +206,6 @@ void __cpuidle arch_cpu_idle(void)

		static int __init parisc_idle_init(void)
		{
		const char *marker;

		/* check QEMU/SeaBIOS marker in PAGE0 */
		marker = (char *) &PAGE0->pad0;
		running_on_qemu = (memcmp(marker, "SeaBIOS", 8) == 0);

		if (!running_on_qemu)
		cpu_idle_poll_ctrl(1);

arch/parisc/kernel/setup.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -403,6 +403,9 @@ void start_parisc(void)
		int ret, cpunum;
		struct pdc_coproc_cfg coproc_cfg;

		/* check QEMU/SeaBIOS marker in PAGE0 */
		running_on_qemu = (memcmp(&PAGE0->pad0, "SeaBIOS", 8) == 0);

		cpunum = smp_processor_id();

		set_firmware_width_unlocked();