parisc: Detect QEMU earlier in boot process

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: d383953852a6 ("parisc: qemu idle sleep support")
Signed-off-by: Helge Deller <deller@gmx.de>
Cc: stable@vger.kernel.org # v4.14+

diff --git a/arch/parisc/kernel/process.c b/arch/parisc/kernel/process.c
index eb39e7e380d7e27b24f6bae39ae0e6c3583511e3..841db71958cdb50dff183dd058a9b09a5ec81421 100644 (file)
--- a/arch/parisc/kernel/process.c
+++ b/arch/parisc/kernel/process.c
@@ -210,12 +210,6 @@ 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);
 

diff --git a/arch/parisc/kernel/setup.c b/arch/parisc/kernel/setup.c
index 15dd9e21be7eac6d1fcf37d67f72de9b227bfa75..d908058d05c10bf4880e361070c30a42b668fd7e 100644 (file)
--- a/arch/parisc/kernel/setup.c
+++ b/arch/parisc/kernel/setup.c
@@ -397,6 +397,9 @@ void __init 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();
 
        init_cpu_topology();