linux-kernel - Re: [RFC] mm: Allow ZONE_DMA32 to be disabled via kernel command line

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Message-ID: <70ab19eb-c41a-980d-46f6-2bb02163974e@infradead.org>
Date:   Thu, 26 Jan 2023 16:57:18 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Dave Hansen <dave.hansen@...el.com>,
        Georgi Djakov <quic_c_gdjako@...cinc.com>,
        catalin.marinas@....com, will@...nel.org
Cc:     dave.hansen@...ux.intel.com, luto@...nel.org, peterz@...radead.org,
        tglx@...utronix.de, mingo@...hat.com, bp@...en8.de, hpa@...or.com,
        hch@....de, m.szyprowski@...sung.com, robin.murphy@....com,
        linux-arm-kernel@...ts.infradead.org, iommu@...ts.linux.dev,
        linux-kernel@...r.kernel.org, djakov@...nel.org
Subject: Re: [RFC] mm: Allow ZONE_DMA32 to be disabled via kernel command line



On 1/26/23 10:51, Dave Hansen wrote:
> On 1/26/23 08:43, Georgi Djakov wrote:
>> From: Chris Goldsworthy <quic_cgoldswo@...cinc.com>

  
>> +static int __init early_disable_dma32(char *buf)
>> +{
>> +	if (!buf)
>> +		return -EINVAL;
>> +
>> +	if (!strcmp(buf, "on"))
>> +		disable_dma32 = true;
>> +
>> +	return 0;
>> +}
>> +early_param("disable_dma32", early_disable_dma32);
> 
> Ick.  Is there no way to do this other than a cross-arch copy/paste?

I think that using __setup() instead of early_param() would allow that.

-- 
~Randy