linux-kernel - [PATCH v2] Fix display of Maximum Memory

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Date:   Wed, 15 Jan 2020 08:53:59 -0600
From:   Michael Bringmann <mwb@...ux.ibm.com>
To:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        Michael Ellerman <mpe@...erman.id.au>,
        Gustavo Walbon <gwalbon@...ux.ibm.com>,
        Paul Mackerras <paulus@...ba.org>
Subject: [PATCH v2] Fix display of Maximum Memory

Correct overflow problem in calculation+display of Maximum Memory
value to syscfg where 32bits is insufficient.

Signed-off-by: Michael Bringmann <mwb@...ux.ibm.com>
---
 arch/powerpc/platforms/pseries/lparcfg.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/powerpc/platforms/pseries/lparcfg.c b/arch/powerpc/platforms/pseries/lparcfg.c
index e33e8bc..f00411c 100644
--- a/arch/powerpc/platforms/pseries/lparcfg.c
+++ b/arch/powerpc/platforms/pseries/lparcfg.c
@@ -433,12 +433,12 @@ static void parse_em_data(struct seq_file *m)
 
 static void maxmem_data(struct seq_file *m)
 {
-	unsigned long maxmem = 0;
+	u64 maxmem = 0;
 
-	maxmem += drmem_info->n_lmbs * drmem_info->lmb_size;
-	maxmem += hugetlb_total_pages() * PAGE_SIZE;
+	maxmem += (u64)drmem_info->n_lmbs * drmem_info->lmb_size;
+	maxmem += (u64)hugetlb_total_pages() * PAGE_SIZE;
 
-	seq_printf(m, "MaxMem=%ld\n", maxmem);
+	seq_printf(m, "MaxMem=%llu\n", maxmem);
 }
 
 static int pseries_lparcfg_data(struct seq_file *m, void *v)
-- 
1.8.3.1