linux-kernel - Re: [PATCH] parisc: Enable LOCKDEP support

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Message-ID: <35c48a28-db5d-731f-b2c3-fb63e5274c3e@gmx.de>
Date:   Tue, 30 May 2023 17:21:44 +0200
From:   Helge Deller <deller@....de>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     linux-kernel@...r.kernel.org, linux-parisc@...r.kernel.org
Subject: Re: [PATCH] parisc: Enable LOCKDEP support

On 5/30/23 16:19, Guenter Roeck wrote:
> Helge,
>
> On Tue, May 23, 2023 at 09:06:40AM +0200, Helge Deller wrote:
>> Cc: <stable@...r.kernel.org> # v6.0+
>> Signed-off-by: Helge Deller <deller@....de>
>> ---
>>   arch/parisc/Kconfig | 4 ++++
>>   1 file changed, 4 insertions(+)
>>
>> diff --git a/arch/parisc/Kconfig b/arch/parisc/Kconfig
>> index 466a25525364..967bde65dd0e 100644
>> --- a/arch/parisc/Kconfig
>> +++ b/arch/parisc/Kconfig
>> @@ -130,6 +130,10 @@ config PM
>>   config STACKTRACE_SUPPORT
>>   	def_bool y
>>
>> +config LOCKDEP_SUPPORT
>> +	bool
>> +	default y
>> +
>>   config ISA_DMA_API
>>   	bool
>>
>
> This patch results in a bunch of WARNING message with each parisc boot if
> CONFIG_PROVE_LOCKING and CONFIG_DEBUG_LOCKDEP are enabled.
>
> WARNING: CPU: 0 PID: 0 at kernel/locking/lockdep.c:5545 check_flags+0x24c/0x274
> Backtrace:
>   [<1026d44c>] lock_acquire+0xdc/0x388
>   [<10e8c66c>] _raw_spin_lock_irqsave+0x64/0x98
>   [<10e922dc>] down_trylock+0x20/0x58
>   [<102768c8>] __down_trylock_console_sem+0x44/0x114
>   [<1027b768>] vprintk_emit+0xa8/0x3dc
>   [<1027bac4>] vprintk_default+0x28/0x38
>   [<1027c574>] vprintk+0xa4/0xb4
>   [<10e6c62c>] _printk+0x30/0x40
>   [<10e37700>] report_bug+0x338/0x35c
>   [<101c19fc>] handle_interruption+0x654/0x768
>   [<101bb070>] intr_check_sig+0x0/0x38
>
> WARNING: CPU: 0 PID: 0 at kernel/context_tracking.c:367 ct_irq_enter+0x94/0xb0
> Backtrace:
>   [<101f0c1c>] irq_enter+0x18/0x30
>   [<101c2dec>] do_cpu_irq_mask+0x7c/0x388
>   [<101bb064>] intr_return+0x0/0xc
>
> Is that going to be fixed, or should I disable CONFIG_PROVE_LOCKING
> for parisc in my testing ?

They should be looked at and fixed over time. Right now please disable
for now, as I personally won't have time to check as I'm leaving
for vacation. You may send me your .config in private mail though, in
case I find time.

Helge