ACPI: platform_profile: Avoid initializing on non-ACPI platforms

JIRA: https://issues.redhat.com/browse/RHEL-105420

commit dd13316
Author: Alexandre Ghiti <[email protected]>
Date:   Thu May 22 16:13:56 2025 +0200

    ACPI: platform_profile: Avoid initializing on non-ACPI platforms

    The platform profile driver is loaded even on platforms that do not have
    ACPI enabled. The initialization of the sysfs entries was recently moved
    from platform_profile_register() to the module init call, and those
    entries need acpi_kobj to be initialized which is not the case when ACPI
    is disabled.

    This results in the following warning:

     WARNING: CPU: 5 PID: 1 at fs/sysfs/group.c:131 internal_create_group+0xa22/0xdd8
     Modules linked in:
     CPU: 5 UID: 0 PID: 1 Comm: swapper/0 Tainted: G        W           6.15.0-rc7-dirty #6 PREEMPT
     Tainted: [W]=WARN
     Hardware name: riscv-virtio,qemu (DT)
     epc : internal_create_group+0xa22/0xdd8
      ra : internal_create_group+0xa22/0xdd8

     Call Trace:

     internal_create_group+0xa22/0xdd8
     sysfs_create_group+0x22/0x2e
     platform_profile_init+0x74/0xb2
     do_one_initcall+0x198/0xa9e
     kernel_init_freeable+0x6d8/0x780
     kernel_init+0x28/0x24c
     ret_from_fork+0xe/0x18

    Fix this by checking if ACPI is enabled before trying to create sysfs
    entries.

    Fixes: 77be5ca ("ACPI: platform_profile: Create class for ACPI platform profile")
    Signed-off-by: Alexandre Ghiti <[email protected]>
    Reviewed-by: Arnd Bergmann <[email protected]>
    Reviewed-by: Mark Pearson <[email protected]>
    Link: https://patch.msgid.link/[email protected]
    [ rjw: Subject and changelog edits ]
    Signed-off-by: Rafael J. Wysocki <[email protected]>

Signed-off-by: David Arcari <[email protected]>

Author: darcari

drivers/acpi/platform_profile.c

@@ -691,6 +691,9 @@ static int __init platform_profile_init(void)
 {
 	int err;
 
+	if (acpi_disabled)
+		return -EOPNOTSUPP;
+
 	err = class_register(&platform_profile_class);
 	if (err)
 		return err;