linux-kernel - [PATCH v3 1/3] ACPI: CPPC: Add definition for undefined FADT preferred PM profile value

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Message-ID: <20230620172433.21325-2-mario.limonciello@amd.com>
Date:   Tue, 20 Jun 2023 12:24:31 -0500
From:   Mario Limonciello <mario.limonciello@....com>
To:     "Rafael J . Wysocki" <rafael@...nel.org>
CC:     Len Brown <lenb@...nel.org>, Huang Rui <ray.huang@....com>,
        <linux-acpi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-pm@...r.kernel.org>,
        Gautham Ranjal Shenoy <gautham.shenoy@....com>,
        Wyes Karny <Wyes.Karny@....com>,
        Perry Yuan <perry.yuan@....com>,
        "Mario Limonciello" <mario.limonciello@....com>
Subject: [PATCH v3 1/3] ACPI: CPPC: Add definition for undefined FADT preferred PM profile value

In the event a new preferred PM profile value is introduced it's best for
code to be able to defensively guard against it so that the wrong settings
don't get applied on a new system that uses this profile but ancient
kernels.

Acked-by: Huang Rui <ray.huang@....com>
Suggested-by: Gautham Ranjal Shenoy <gautham.shenoy@....com>
Link: https://uefi.org/htmlspecs/ACPI_Spec_6_4_html/05_ACPI_Software_Programming_Model/ACPI_Software_Programming_Model.html#fixed-acpi-description-table-fadt
Signed-off-by: Mario Limonciello <mario.limonciello@....com>
---
v2->v3:
 * Drop new symbols (they fold into patch 2)
 * Update commit message
 * Add Ray's tag
---
 include/acpi/actbl.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/acpi/actbl.h b/include/acpi/actbl.h
index e5dfb6f4de52..451f6276da49 100644
--- a/include/acpi/actbl.h
+++ b/include/acpi/actbl.h
@@ -307,7 +307,8 @@ enum acpi_preferred_pm_profiles {
 	PM_SOHO_SERVER = 5,
 	PM_APPLIANCE_PC = 6,
 	PM_PERFORMANCE_SERVER = 7,
-	PM_TABLET = 8
+	PM_TABLET = 8,
+	NR_PM_PROFILES = 9
 };
 
 /* Values for sleep_status and sleep_control registers (V5+ FADT) */
-- 
2.34.1