linux-kernel - [PATCH 1/3] powerpc/mm: Initialize the HPTE encoding values

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Date:   Fri, 30 Aug 2019 14:07:10 +0200
From:   Laurent Dufour <ldufour@...ux.ibm.com>
To:     mpe@...erman.id.au, benh@...nel.crashing.org, paulus@...ba.org,
        aneesh.kumar@...ux.ibm.com, npiggin@...il.com
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 1/3] powerpc/mm: Initialize the HPTE encoding values

Before reading the HPTE encoding values we initialize all of them to -1 (an
invalid value) to later being able to detect the initialized ones.

Signed-off-by: Laurent Dufour <ldufour@...ux.ibm.com>
---
 arch/powerpc/mm/book3s64/hash_utils.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/mm/book3s64/hash_utils.c b/arch/powerpc/mm/book3s64/hash_utils.c
index c3bfef08dcf8..2039bc315459 100644
--- a/arch/powerpc/mm/book3s64/hash_utils.c
+++ b/arch/powerpc/mm/book3s64/hash_utils.c
@@ -408,7 +408,7 @@ static int __init htab_dt_scan_page_sizes(unsigned long node,
 {
 	const char *type = of_get_flat_dt_prop(node, "device_type", NULL);
 	const __be32 *prop;
-	int size = 0;
+	int size = 0, idx, base_idx;
 
 	/* We are scanning "cpu" nodes only */
 	if (type == NULL || strcmp(type, "cpu") != 0)
@@ -418,6 +418,11 @@ static int __init htab_dt_scan_page_sizes(unsigned long node,
 	if (!prop)
 		return 0;
 
+	/* Set all the penc values to invalid */
+	for (base_idx = 0; base_idx < MMU_PAGE_COUNT; base_idx++)
+		for (idx = 0; idx < MMU_PAGE_COUNT; idx++)
+			mmu_psize_defs[base_idx].penc[idx] = -1;
+
 	pr_info("Page sizes from device-tree:\n");
 	size /= 4;
 	cur_cpu_spec->mmu_features &= ~(MMU_FTR_16M_PAGE);
@@ -426,7 +431,6 @@ static int __init htab_dt_scan_page_sizes(unsigned long node,
 		unsigned int slbenc = be32_to_cpu(prop[1]);
 		unsigned int lpnum = be32_to_cpu(prop[2]);
 		struct mmu_psize_def *def;
-		int idx, base_idx;
 
 		size -= 3; prop += 3;
 		base_idx = get_idx_from_shift(base_shift);
-- 
2.23.0