linux-kernel - [PATCH] Fix UV4 Hub Revision adjustment

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Message-Id: <20201203152252.371199-1-mike.travis@hpe.com>
Date:   Thu,  3 Dec 2020 09:22:52 -0600
From:   Mike Travis <mike.travis@....com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Hans de Goede <hdegoede@...hat.com>,
        Steve Wahl <steve.wahl@....com>, x86@...nel.org
Cc:     Mike Travis <mike.travis@....com>,
        Dimitri Sivanich <dimitri.sivanich@....com>,
        Russ Anderson <russ.anderson@....com>,
        "H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org
Subject: [PATCH] Fix UV4 Hub Revision adjustment

Fix UV4 Hub Revision adjustment as Hub chip starts with revision 1.
Incorrectly identifies UV4 as UV4A and UV4A as UV5.

Fixes 647128f1536ef: x86/platform/uv: Update UV MMRs for UV5

Signed-off-by: Mike Travis <mike.travis@....com>
Acked-by: Dimitri Sivanich <dimitri.sivanich@....com>
---
 arch/x86/kernel/apic/x2apic_uv_x.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/apic/x2apic_uv_x.c b/arch/x86/kernel/apic/x2apic_uv_x.c
index 1b98f8c12b96..235f5cde06fc 100644
--- a/arch/x86/kernel/apic/x2apic_uv_x.c
+++ b/arch/x86/kernel/apic/x2apic_uv_x.c
@@ -161,7 +161,7 @@ static int __init early_set_hub_type(void)
 	/* UV4/4A only have a revision difference */
 	case UV4_HUB_PART_NUMBER:
 		uv_min_hub_revision_id = node_id.s.revision
-					 + UV4_HUB_REVISION_BASE;
+					 + UV4_HUB_REVISION_BASE - 1;
 		uv_hub_type_set(UV4);
 		if (uv_min_hub_revision_id == UV4A_HUB_REVISION_BASE)
 			uv_hub_type_set(UV4|UV4A);
-- 
2.21.0