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From: Marc Zyngier <marc.zyngier@arm.com>
To: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Cc: David Lechner <david@lechnology.com>,
	Kevin Hilman <khilman@kernel.org>,
	Bartosz Golaszewski <brgl@bgdev.pl>, Sekhar Nori <nsekhar@ti.com>,
	LKML <linux-kernel@vger.kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	arm-soc <linux-arm-kernel@lists.infradead.org>,
	Jason Cooper <jason@lakedaemon.net>
Subject: Re: [RESEND PATCH v2 28/33] ARM: davinci: cp-intc: unify error handling
Date: Mon, 11 Feb 2019 13:20:20 +0000
Message-ID: <16f8fc15-2522-f1ef-0550-90802b09e9bf@arm.com> (raw)
In-Reply-To: <CAMpxmJVeQe7sxfharvA8REsOdmeaQUr2f1ByJwHCc5NnaFYEsw@mail.gmail.com>

On 11/02/2019 13:10, Bartosz Golaszewski wrote:
> pon., 11 lut 2019 o 14:08 Marc Zyngier <marc.zyngier@arm.com> napisał(a):
>>
>> On 11/02/2019 12:26, Bartosz Golaszewski wrote:
>>> From: Bartosz Golaszewski <bgolaszewski@baylibre.com>
>>>
>>> Use WARN_ON() on eny error in cp-intc initialization and drop all
>>> custom error messages.
>>>
>>> Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
>>> Reviewed-by: David Lechner <david@lechnology.com>
>>> ---
>>>  arch/arm/mach-davinci/cp_intc.c | 10 +++-------
>>>  1 file changed, 3 insertions(+), 7 deletions(-)
>>>
>>> diff --git a/arch/arm/mach-davinci/cp_intc.c b/arch/arm/mach-davinci/cp_intc.c
>>> index f3787ae4cdbd..c1efb9390655 100644
>>> --- a/arch/arm/mach-davinci/cp_intc.c
>>> +++ b/arch/arm/mach-davinci/cp_intc.c
>>> @@ -200,20 +200,16 @@ davinci_cp_intc_do_init(const struct davinci_cp_intc_config *config,
>>>                       DAVINCI_CP_INTC_CHAN_MAP(offset));
>>>
>>>       irq_base = irq_alloc_descs(-1, 0, config->num_irqs, 0);
>>> -     if (irq_base < 0) {
>>> -             pr_warn("Couldn't allocate IRQ numbers\n");
>>> -             irq_base = 0;
>>> -     }
>>> +     if (WARN_ON(irq_base < 0))
>>> +             return irq_base;
>>>
>>>       /* create a legacy host */
>>>       davinci_cp_intc_irq_domain = irq_domain_add_legacy(
>>>                                       node, config->num_irqs, irq_base, 0,
>>>                                       &davinci_cp_intc_irq_domain_ops, NULL);
>>>
>>> -     if (!davinci_cp_intc_irq_domain) {
>>> -             pr_err("cp_intc: failed to allocate irq host!\n");
>>> +     if (WARN_ON(!davinci_cp_intc_irq_domain))
>>>               return -EINVAL;
>>> -     }
>>>
>>>       set_handle_irq(davinci_cp_intc_handle_irq);
>>>
>>>
>>
>> I'm sorry, but how is turning an explicit message into a long stack
>> trace really useful?
>>
> 
> If any of these calls fails, the system is fried. I assumed that a
> stack trace will point users straight to the offending line.

The message is a really good clue, because you can actually grep for it,
and it gives you the exact symptom. You are actively removing
information here.

	M.
-- 
Jazz is not dead. It just smells funny...

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  reply index

Thread overview: 49+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-02-11 12:25 [RESEND PATCH v2 00/33] ARM: davinci: modernize the irq support Bartosz Golaszewski
2019-02-11 12:25 ` [RESEND PATCH v2 01/33] ARM: davinci: remove intc_host_map from davinci_soc_info struct Bartosz Golaszewski
2019-02-11 12:25 ` [RESEND PATCH v2 02/33] ARM: davinci: aintc: use irq domain Bartosz Golaszewski
2019-02-12  8:26   ` Sekhar Nori
2019-02-11 12:25 ` [RESEND PATCH v2 03/33] ARM: davinci: select GENERIC_IRQ_MULTI_HANDLER Bartosz Golaszewski
2019-02-11 12:50   ` Marc Zyngier
2019-02-11 13:08     ` Bartosz Golaszewski
2019-02-11 12:25 ` [RESEND PATCH v2 04/33] ARM: davinci: remove davinci_intc_type Bartosz Golaszewski
2019-02-11 12:25 ` [RESEND PATCH v2 05/33] ARM: davinci: pull davinci_intc_base into the respective intc drivers Bartosz Golaszewski
2019-02-11 12:25 ` [RESEND PATCH v2 06/33] ARM: davinci: wrap HW interrupt numbers with a macro Bartosz Golaszewski
2019-02-11 12:25 ` [RESEND PATCH v2 07/33] ARM: davinci: select SPARSE_IRQ Bartosz Golaszewski
2019-02-11 12:25 ` [RESEND PATCH v2 08/33] ARM: davinci: make irqs.h a local header Bartosz Golaszewski
2019-02-12  8:31   ` Sekhar Nori
2019-02-11 12:25 ` [RESEND PATCH v2 09/33] ARM: davinci: aintc: drop GPL license boilerplate Bartosz Golaszewski
2019-02-11 12:25 ` [RESEND PATCH v2 10/33] ARM: davinci: aintc: wrap davinci_irq_init() with a helper Bartosz Golaszewski
2019-02-11 12:25 ` [RESEND PATCH v2 11/33] ARM: davinci: aintc: use a common prefix for symbols in the driver Bartosz Golaszewski
2019-02-11 12:25 ` [RESEND PATCH v2 12/33] ARM: davinci: aintc: drop the 00 prefix from register offsets Bartosz Golaszewski
2019-02-11 12:25 ` [RESEND PATCH v2 13/33] ARM: davinci: aintc: use readl/writel_relaxed() Bartosz Golaszewski
2019-02-11 12:54   ` Marc Zyngier
2019-02-11 12:25 ` [RESEND PATCH v2 14/33] irqchip: davinci-aintc: add a new config structure Bartosz Golaszewski
2019-02-11 12:25 ` [RESEND PATCH v2 15/33] ARM: davinci: aintc: use the new irqchip config structure in dm* SoCs Bartosz Golaszewski
2019-02-11 12:25 ` [RESEND PATCH v2 16/33] ARM: davinci: aintc: use the new config structure Bartosz Golaszewski
2019-02-11 12:25 ` [RESEND PATCH v2 17/33] ARM: davinci: aintc: move timer-specific irq_set_handler() out of irq.c Bartosz Golaszewski
2019-02-11 13:00   ` Marc Zyngier
2019-02-12  5:51     ` Sekhar Nori
2019-02-14 10:55       ` Marc Zyngier
2019-02-11 12:25 ` [RESEND PATCH v2 18/33] ARM: davinci: aintc: remove unnecessary includes Bartosz Golaszewski
2019-02-11 12:25 ` [RESEND PATCH v2 19/33] irqchip: davinci-aintc: move the driver to drivers/irqchip Bartosz Golaszewski
2019-02-11 12:25 ` [RESEND PATCH v2 20/33] ARM: davinci: cp-intc: remove cp_intc.h Bartosz Golaszewski
2019-02-11 12:25 ` [RESEND PATCH v2 21/33] ARM: davinci: cp-intc: add a wrapper around cp_intc_init() Bartosz Golaszewski
2019-02-11 12:25 ` [RESEND PATCH v2 22/33] irqchip: davinci-cp-intc: add a new config structure Bartosz Golaszewski
2019-02-11 12:25 ` [RESEND PATCH v2 23/33] ARM: davinci: cp-intc: add the new config structures for da8xx SoCs Bartosz Golaszewski
2019-02-11 12:25 ` [RESEND PATCH v2 24/33] ARM: davinci: cp-intc: use a common prefix for all symbols Bartosz Golaszewski
2019-02-11 12:25 ` [RESEND PATCH v2 25/33] ARM: davinci: cp-intc: convert all hex numbers to lowercase Bartosz Golaszewski
2019-02-11 12:25 ` [RESEND PATCH v2 26/33] ARM: davinci: cp-intc: use the new-style config structure Bartosz Golaszewski
2019-02-11 12:26 ` [RESEND PATCH v2 27/33] ARM: davinci: cp-intc: improve coding style Bartosz Golaszewski
2019-02-11 12:26 ` [RESEND PATCH v2 28/33] ARM: davinci: cp-intc: unify error handling Bartosz Golaszewski
2019-02-11 13:07   ` Marc Zyngier
2019-02-11 13:10     ` Bartosz Golaszewski
2019-02-11 13:20       ` Marc Zyngier [this message]
2019-02-11 12:26 ` [RESEND PATCH v2 29/33] ARM: davinci: cp-intc: use readl/writel_relaxed() Bartosz Golaszewski
2019-02-11 13:08   ` Marc Zyngier
2019-02-12  9:32     ` Bartosz Golaszewski
2019-02-11 12:26 ` [RESEND PATCH v2 30/33] ARM: davinci: cp-intc: drop GPL license boilerplate Bartosz Golaszewski
2019-02-11 12:26 ` [RESEND PATCH v2 31/33] ARM: davinci: cp-intc: remove redundant comments Bartosz Golaszewski
2019-02-11 12:26 ` [RESEND PATCH v2 32/33] irqchip: davinci-cp-intc: move the driver to drivers/irqchip Bartosz Golaszewski
2019-02-11 12:26 ` [RESEND PATCH v2 33/33] ARM: davinci: remove intc related fields from davinci_soc_info Bartosz Golaszewski
2019-02-12  8:24 ` [RESEND PATCH v2 00/33] ARM: davinci: modernize the irq support Sekhar Nori
2019-02-12  8:31   ` Bartosz Golaszewski

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