linux-kernel - [PATCH 4.19 44/92] pseries: Fix 64 bit logical memory block panic

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Message-Id: <20200820091539.916876717@linuxfoundation.org>
Date:   Thu, 20 Aug 2020 11:21:29 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Anton Blanchard <anton@...abs.org>,
        Michael Ellerman <mpe@...erman.id.au>
Subject: [PATCH 4.19 44/92] pseries: Fix 64 bit logical memory block panic

From: Anton Blanchard <anton@...abs.org>

commit 89c140bbaeee7a55ed0360a88f294ead2b95201b upstream.

Booting with a 4GB LMB size causes us to panic:

  qemu-system-ppc64: OS terminated: OS panic:
      Memory block size not suitable: 0x0

Fix pseries_memory_block_size() to handle 64 bit LMBs.

Cc: stable@...r.kernel.org
Signed-off-by: Anton Blanchard <anton@...abs.org>
Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
Link: https://lore.kernel.org/r/20200715000820.1255764-1-anton@ozlabs.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/powerpc/platforms/pseries/hotplug-memory.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/powerpc/platforms/pseries/hotplug-memory.c
+++ b/arch/powerpc/platforms/pseries/hotplug-memory.c
@@ -31,7 +31,7 @@ static bool rtas_hp_event;
 unsigned long pseries_memory_block_size(void)
 {
 	struct device_node *np;
-	unsigned int memblock_size = MIN_MEMORY_BLOCK_SIZE;
+	u64 memblock_size = MIN_MEMORY_BLOCK_SIZE;
 	struct resource r;
 
 	np = of_find_node_by_path("/ibm,dynamic-reconfiguration-memory");