[PATCH v2] powerpc/pseries: Fix maximum memory value

[Aravinda Prasad]

Calculating the maximum memory based on the number of lmbs
and lmb size does not account for the RMA region. Hence
use memory_hotplug_max(), which already accounts for the
RMA region, to fetch the maximum memory value. Thanks to
Nathan Lynch for suggesting the memory_hotplug_max()
function.

Fixes: 772b039fd9a7: ("powerpc/pseries: Export maximum memory value")
Signed-off-by: Aravinda Prasad <aravi...@linux.vnet.ibm.com>
---
 arch/powerpc/platforms/pseries/lparcfg.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/platforms/pseries/lparcfg.c 
b/arch/powerpc/platforms/pseries/lparcfg.c
index e33e8bc..010a41f 100644
--- a/arch/powerpc/platforms/pseries/lparcfg.c
+++ b/arch/powerpc/platforms/pseries/lparcfg.c
@@ -23,6 +23,7 @@
 #include <linux/slab.h>
 #include <linux/uaccess.h>
 #include <linux/hugetlb.h>
+#include <linux/memblock.h>
 #include <asm/lppaca.h>
 #include <asm/hvcall.h>
 #include <asm/firmware.h>
@@ -33,7 +34,6 @@
 #include <asm/vio.h>
 #include <asm/mmu.h>
 #include <asm/machdep.h>
-#include <asm/drmem.h>
 
 #include "pseries.h"
 
@@ -435,7 +435,7 @@ static void maxmem_data(struct seq_file *m)
 {
        unsigned long maxmem = 0;
 
-       maxmem += drmem_info->n_lmbs * drmem_info->lmb_size;
+       maxmem += memory_hotplug_max();
        maxmem += hugetlb_total_pages() * PAGE_SIZE;
 
        seq_printf(m, "MaxMem=%ld\n", maxmem);