Re: next/master bisection: baseline.dmesg.crit on qemu_arm-vexpress-a15

From: Guillaume Tucker
Date: Fri Jun 26 2020 - 16:23:21 EST

On 26/06/2020 20:11, kernelci.org bot wrote:
> * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
> * This automated bisection report was sent to you on the basis *
> * that you may be involved with the breaking commit it has *
> * found. No manual investigation has been done to verify it, *
> * and the root cause of the problem may be somewhere else. *
> * *
> * If you do send a fix, please include this trailer: *
> * Reported-by: "kernelci.org bot" <bot@xxxxxxxxxxxx> *
> * *
> * Hope this helps! *
> * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
>
> next/master bisection: baseline.dmesg.crit on qemu_arm-vexpress-a15
>
> Summary:
> Start: 36e3135df4d4 Add linux-next specific files for 20200626
> Plain log: https://storage.kernelci.org/next/master/next-20200626/arm/vexpress_defconfig/gcc-8/lab-collabora/baseline-vexpress-v2p-ca15-tc1.txt
> HTML log: https://storage.kernelci.org/next/master/next-20200626/arm/vexpress_defconfig/gcc-8/lab-collabora/baseline-vexpress-v2p-ca15-tc1.html
> Result: 38ac46002d1d arm: dts: vexpress: Move mcc node back into motherboard node
>
> Checks:
> revert: PASS
> verify: PASS
>
> Parameters:
> Tree: next
> URL: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
> Branch: master
> Target: qemu_arm-vexpress-a15
> CPU arch: arm
> Lab: lab-collabora
> Compiler: gcc-8
> Config: vexpress_defconfig
> Test case: baseline.dmesg.crit

The critical error message allegedly caused by this commit is:

<2>GIC CPU mask not found - kernel will fail to boot.

The report needs to be improved to show it automatically, sorry
if this wasn't clear.

Guillaume


> Breaking commit found:
>
> -------------------------------------------------------------------------------
> commit 38ac46002d1df5707566a73486452851341028d2
> Author: Andre Przywara <andre.przywara@xxxxxxx>
> Date: Wed Jun 3 17:22:37 2020 +0100
>
> arm: dts: vexpress: Move mcc node back into motherboard node
>
> Commit d9258898ad49 ("arm64: dts: arm: vexpress: Move fixed devices
> out of bus node") moved the "mcc" DT node into the root node, because
> it does not have any children using "reg" properties, so does violate
> some dtc checks about "simple-bus" nodes.
>
> However this broke the vexpress config-bus code, which walks up the
> device tree to find the first node with an "arm,vexpress,site" property.
> This gave the wrong result (matching the root node instead of the
> motherboard node), so broke the clocks and some other devices for
> VExpress boards.
>
> Move the whole node back into its original position. This re-introduces
> the dtc warning, but is conceptually the right thing to do. The dtc
> warning seems to be overzealous here, there are discussions on fixing or
> relaxing this check instead.
>
> Link: https://lore.kernel.org/r/20200603162237.16319-1-andre.przywara@xxxxxxx
> Fixes: d9258898ad49 ("arm64: dts: vexpress: Move fixed devices out of bus node")
> Reported-and-tested-by: Guenter Roeck <linux@xxxxxxxxxxxx>
> Signed-off-by: Andre Przywara <andre.przywara@xxxxxxx>
> Signed-off-by: Sudeep Holla <sudeep.holla@xxxxxxx>
>
> diff --git a/arch/arm/boot/dts/vexpress-v2m-rs1.dtsi b/arch/arm/boot/dts/vexpress-v2m-rs1.dtsi
> index e6308fb76183..a88ee5294d35 100644
> --- a/arch/arm/boot/dts/vexpress-v2m-rs1.dtsi
> +++ b/arch/arm/boot/dts/vexpress-v2m-rs1.dtsi
> @@ -100,79 +100,6 @@
> };
> };
>
> - mcc {
> - compatible = "arm,vexpress,config-bus";
> - arm,vexpress,config-bridge = <&v2m_sysreg>;
> -
> - oscclk0 {
> - /* MCC static memory clock */
> - compatible = "arm,vexpress-osc";
> - arm,vexpress-sysreg,func = <1 0>;
> - freq-range = <25000000 60000000>;
> - #clock-cells = <0>;
> - clock-output-names = "v2m:oscclk0";
> - };
> -
> - v2m_oscclk1: oscclk1 {
> - /* CLCD clock */
> - compatible = "arm,vexpress-osc";
> - arm,vexpress-sysreg,func = <1 1>;
> - freq-range = <23750000 65000000>;
> - #clock-cells = <0>;
> - clock-output-names = "v2m:oscclk1";
> - };
> -
> - v2m_oscclk2: oscclk2 {
> - /* IO FPGA peripheral clock */
> - compatible = "arm,vexpress-osc";
> - arm,vexpress-sysreg,func = <1 2>;
> - freq-range = <24000000 24000000>;
> - #clock-cells = <0>;
> - clock-output-names = "v2m:oscclk2";
> - };
> -
> - volt-vio {
> - /* Logic level voltage */
> - compatible = "arm,vexpress-volt";
> - arm,vexpress-sysreg,func = <2 0>;
> - regulator-name = "VIO";
> - regulator-always-on;
> - label = "VIO";
> - };
> -
> - temp-mcc {
> - /* MCC internal operating temperature */
> - compatible = "arm,vexpress-temp";
> - arm,vexpress-sysreg,func = <4 0>;
> - label = "MCC";
> - };
> -
> - reset {
> - compatible = "arm,vexpress-reset";
> - arm,vexpress-sysreg,func = <5 0>;
> - };
> -
> - muxfpga {
> - compatible = "arm,vexpress-muxfpga";
> - arm,vexpress-sysreg,func = <7 0>;
> - };
> -
> - shutdown {
> - compatible = "arm,vexpress-shutdown";
> - arm,vexpress-sysreg,func = <8 0>;
> - };
> -
> - reboot {
> - compatible = "arm,vexpress-reboot";
> - arm,vexpress-sysreg,func = <9 0>;
> - };
> -
> - dvimode {
> - compatible = "arm,vexpress-dvimode";
> - arm,vexpress-sysreg,func = <11 0>;
> - };
> - };
> -
> bus@8000000 {
> motherboard-bus {
> model = "V2M-P1";
> @@ -435,6 +362,79 @@
> };
> };
> };
> +
> + mcc {
> + compatible = "arm,vexpress,config-bus";
> + arm,vexpress,config-bridge = <&v2m_sysreg>;
> +
> + oscclk0 {
> + /* MCC static memory clock */
> + compatible = "arm,vexpress-osc";
> + arm,vexpress-sysreg,func = <1 0>;
> + freq-range = <25000000 60000000>;
> + #clock-cells = <0>;
> + clock-output-names = "v2m:oscclk0";
> + };
> +
> + v2m_oscclk1: oscclk1 {
> + /* CLCD clock */
> + compatible = "arm,vexpress-osc";
> + arm,vexpress-sysreg,func = <1 1>;
> + freq-range = <23750000 65000000>;
> + #clock-cells = <0>;
> + clock-output-names = "v2m:oscclk1";
> + };
> +
> + v2m_oscclk2: oscclk2 {
> + /* IO FPGA peripheral clock */
> + compatible = "arm,vexpress-osc";
> + arm,vexpress-sysreg,func = <1 2>;
> + freq-range = <24000000 24000000>;
> + #clock-cells = <0>;
> + clock-output-names = "v2m:oscclk2";
> + };
> +
> + volt-vio {
> + /* Logic level voltage */
> + compatible = "arm,vexpress-volt";
> + arm,vexpress-sysreg,func = <2 0>;
> + regulator-name = "VIO";
> + regulator-always-on;
> + label = "VIO";
> + };
> +
> + temp-mcc {
> + /* MCC internal operating temperature */
> + compatible = "arm,vexpress-temp";
> + arm,vexpress-sysreg,func = <4 0>;
> + label = "MCC";
> + };
> +
> + reset {
> + compatible = "arm,vexpress-reset";
> + arm,vexpress-sysreg,func = <5 0>;
> + };
> +
> + muxfpga {
> + compatible = "arm,vexpress-muxfpga";
> + arm,vexpress-sysreg,func = <7 0>;
> + };
> +
> + shutdown {
> + compatible = "arm,vexpress-shutdown";
> + arm,vexpress-sysreg,func = <8 0>;
> + };
> +
> + reboot {
> + compatible = "arm,vexpress-reboot";
> + arm,vexpress-sysreg,func = <9 0>;
> + };
> +
> + dvimode {
> + compatible = "arm,vexpress-dvimode";
> + arm,vexpress-sysreg,func = <11 0>;
> + };
> + };
> };
> };
> };
> -------------------------------------------------------------------------------
>
>
> Git bisection log:
>
> -------------------------------------------------------------------------------
> git bisect start
> # good: [52366a107bf0600cf366f5ff3ea1f147b285e41f] Merge tag 'fsnotify_for_v5.8-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs
> git bisect good 52366a107bf0600cf366f5ff3ea1f147b285e41f
> # bad: [36e3135df4d426612fc77db26a312c2531108603] Add linux-next specific files for 20200626
> git bisect bad 36e3135df4d426612fc77db26a312c2531108603
> # bad: [11fdea666694c5c8c8a52cb75b2f0e70a2c2c201] Merge remote-tracking branch 'drm/drm-next'
> git bisect bad 11fdea666694c5c8c8a52cb75b2f0e70a2c2c201
> # bad: [39ac1a242d0940dabd9192d99113c2b082ba45bc] Merge remote-tracking branch 'printk/for-next'
> git bisect bad 39ac1a242d0940dabd9192d99113c2b082ba45bc
> # good: [4a750150d9fe543e2163998501b3ad947d6dff74] Merge remote-tracking branch 'at91/at91-next'
> git bisect good 4a750150d9fe543e2163998501b3ad947d6dff74
> # bad: [d7645ac1101c5160a05e2dced672a8d63c2a7ec0] Merge remote-tracking branch 'scmi/for-linux-next'
> git bisect bad d7645ac1101c5160a05e2dced672a8d63c2a7ec0
> # good: [2408a915a05c109169ab689dc91ce31315406513] Merge branches 'arm64-defconfig-for-5.9', 'arm64-for-5.9', 'drivers-for-5.9' and 'dts-for-5.9' into for-next
> git bisect good 2408a915a05c109169ab689dc91ce31315406513
> # good: [1679681fb8b2d169ac9d98660d7390620990bf77] Merge remote-tracking branch 'raspberrypi/for-next'
> git bisect good 1679681fb8b2d169ac9d98660d7390620990bf77
> # good: [137233bdcd265762a251dfa24e82ebc5468e0ec2] Merge remote-tracking branch 'reset/reset/next'
> git bisect good 137233bdcd265762a251dfa24e82ebc5468e0ec2
> # good: [99bcf38dd05b76b41f8564b53d9be6b44613fa92] Merge branch 'v5.9-clk/next' into for-next
> git bisect good 99bcf38dd05b76b41f8564b53d9be6b44613fa92
> # good: [dc45e438fac0b5df3c31bb83f3d809cd0f67dcfe] Merge branch 'next/dt' into for-next
> git bisect good dc45e438fac0b5df3c31bb83f3d809cd0f67dcfe
> # good: [d6fe116541b73a56110310c39a270c99766cd909] Merge branch 'next/soc' into for-next
> git bisect good d6fe116541b73a56110310c39a270c99766cd909
> # bad: [24077bf8f9e69a3a6a2c714634e6c813566a152f] Merge tag 'juno-fix-5.8' of git://git.kernel.org/pub/scm/linux/kernel/git/sudeep.holla/linux into for-linux-next
> git bisect bad 24077bf8f9e69a3a6a2c714634e6c813566a152f
> # bad: [38ac46002d1df5707566a73486452851341028d2] arm: dts: vexpress: Move mcc node back into motherboard node
> git bisect bad 38ac46002d1df5707566a73486452851341028d2
> # first bad commit: [38ac46002d1df5707566a73486452851341028d2] arm: dts: vexpress: Move mcc node back into motherboard node
> -------------------------------------------------------------------------------
>
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