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SubjectRe: [RESEND PATCH v2 28/33] ARM: davinci: cp-intc: unify error handling
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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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