linux-kernel - [PATCH] habanalabs: use do

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Message-Id: <20190301122111.941-1-oded.gabbay@gmail.com>
Date:   Fri,  1 Mar 2019 14:21:11 +0200
From:   Oded Gabbay <oded.gabbay@...il.com>
To:     gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org
Subject: [PATCH] habanalabs: use do_div for 64-bit divisions

This patch fix compilation error in 32-bit ARM architecture regarding
division of 2 64-bit variables.

Use the kernel do_div() macro, which is implemented per architecture, for
doing these divisions instead of using the / operator.

Reported-by: kbuild test robot <lkp@...el.com>
Signed-off-by: Oded Gabbay <oded.gabbay@...il.com>
---
 drivers/misc/habanalabs/mmu.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/misc/habanalabs/mmu.c b/drivers/misc/habanalabs/mmu.c
index ce404e6cc9a9..2f2e99cb2743 100644
--- a/drivers/misc/habanalabs/mmu.c
+++ b/drivers/misc/habanalabs/mmu.c
@@ -261,9 +261,9 @@ int hl_mmu_ctx_init(struct hl_ctx *ctx)
 			!hdev->dram_default_page_mapping)
 		return 0;
 
-	num_of_hop3 = (prop->dram_size_for_default_page_mapping /
-			prop->dram_page_size) /
-			PTE_ENTRIES_IN_HOP;
+	num_of_hop3 = prop->dram_size_for_default_page_mapping;
+	do_div(num_of_hop3, prop->dram_page_size);
+	do_div(num_of_hop3, PTE_ENTRIES_IN_HOP);
 
 	/* add hop1 and hop2 */
 	total_hops = num_of_hop3 + 2;
@@ -378,9 +378,9 @@ void hl_mmu_ctx_fini(struct hl_ctx *ctx)
 	if (hdev->dram_supports_virtual_memory &&
 			hdev->dram_default_page_mapping) {
 
-		num_of_hop3 = (prop->dram_size_for_default_page_mapping /
-				prop->dram_page_size) /
-				PTE_ENTRIES_IN_HOP;
+		num_of_hop3 = prop->dram_size_for_default_page_mapping;
+		do_div(num_of_hop3, prop->dram_page_size);
+		do_div(num_of_hop3, PTE_ENTRIES_IN_HOP);
 
 		/* add hop1 and hop2 */
 		total_hops = num_of_hop3 + 2;
-- 
2.17.1