linux-kernel - Re: [PATCH v5 01/14] clk: microchip: mpfs: fix clk

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Message-Id: <20220929003030.0A61AC433D6@smtp.kernel.org>
Date:   Wed, 28 Sep 2022 17:30:28 -0700
From:   Stephen Boyd <sboyd@...nel.org>
To:     Conor Dooley <conor.dooley@...rochip.com>,
        Daire McNamara <daire.mcnamara@...rochip.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Michael Turquette <mturquette@...libre.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Rob Herring <robh+dt@...nel.org>
Cc:     Paul Walmsley <paul.walmsley@...ive.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Claudiu Beznea <claudiu.beznea@...rochip.com>,
        linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org,
        Nathan Chancellor <nathan@...nel.org>
Subject: Re: [PATCH v5 01/14] clk: microchip: mpfs: fix clk_cfg array bounds violation

Quoting Conor Dooley (2022-09-09 05:31:10)
> There is an array bounds violation present during clock registration,
> triggered by current code by only specific toolchains. This seems to
> fail gracefully in v6.0-rc1, using a toolchain build from the riscv-
> gnu-toolchain repo and with clang-15, and life carries on. While
> converting the driver to use standard clock structs/ops, kernel panics
> were seen during boot when built with clang-15:
> 
[...]
> 
> If parent is RTCREF, so the macro becomes: &mpfs_cfg_clks[33].cfg.hw
> which is well beyond the end of the array. Amazingly, builds with GCC
> 11.1 see no problem here, booting correctly and hooking the parent up
> etc. Builds with clang-15 do not, with the above panic.
> 
> Change the macro to use specific offsets depending on the parent rather
> than the dt-binding's clock IDs.
> 
> Fixes: 1c6a7ea32b8c ("clk: microchip: mpfs: add RTCREF clock control")
> CC: Nathan Chancellor <nathan@...nel.org>
> Signed-off-by: Conor Dooley <conor.dooley@...rochip.com>
> ---

I'll merge this patch over to clk-fixes as well.