linux-kernel - [PATCH v3 1/3] clk: k210: remove an implicit 64-bit division

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Tue, 28 Feb 2023 19:26:55 -0500
From:   Jesse Taube <mr.bossman075@...il.com>
To:     linux-riscv@...ts.infradead.org
Cc:     linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jesse Taube <Mr.Bossman075@...il.com>,
        Yimin Gu <ustcymgu@...il.com>,
        Damien Le Moal <damien.lemoal@....com>,
        Stephen Boyd <sboyd@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Waldemar Brodkorb <wbx@...nadk.org>,
        Albert Ou <aou@...s.berkeley.edu>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Conor Dooley <conor.dooley@...rochip.com>,
        kernel test robot <lkp@...el.com>
Subject: [PATCH v3 1/3] clk: k210: remove an implicit 64-bit division

From: Conor Dooley <conor.dooley@...rochip.com>

The K210 clock driver depends on SOC_CANAAN, which is only selectable
when !MMU on RISC-V. !MMU is not possible on 32-bit yet, but patches
have been sent for its enabling. The kernel test robot reported this
implicit 64-bit division there.

Replace the implicit division with an explicit one.

Reported-by: kernel test robot <lkp@...el.com>
Link: https://lore.kernel.org/linux-riscv/202301201538.zNlqgE4L-lkp@intel.com/
Signed-off-by: Conor Dooley <conor.dooley@...rochip.com>
Signed-off-by: Jesse Taube <Mr.Bossman075@...il.com>
---
V1->V2:
 - new commit
V2->V3:
 - No change
---
 drivers/clk/clk-k210.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/clk/clk-k210.c b/drivers/clk/clk-k210.c
index 67a7cb3503c3..4eed667eddaf 100644
--- a/drivers/clk/clk-k210.c
+++ b/drivers/clk/clk-k210.c
@@ -495,7 +495,7 @@ static unsigned long k210_pll_get_rate(struct clk_hw *hw,
 	f = FIELD_GET(K210_PLL_CLKF, reg) + 1;
 	od = FIELD_GET(K210_PLL_CLKOD, reg) + 1;
 
-	return (u64)parent_rate * f / (r * od);
+	return div_u64((u64)parent_rate * f, r * od);
 }
 
 static const struct clk_ops k210_pll_ops = {
-- 
2.39.0