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Date: Wed, 28 Mar 2018 05:04:40 -0700
From: Christoph Hellwig <hch@infradead.org>
Subject: Re: [PATCH 01/16] initrd: Add generic code path for common initrd
 unloading logic.
Message-ID: <20180328120440.GB1838@infradead.org>
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To: Shea Levy <shea@shealevy.com>
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> +#ifdef CONFIG_INITRAMFS_GENERIC_UNLOAD
> +void free_initrd_mem(unsigned long start, unsigned long end)
> +{
> +       free_reserved_area((void *)start, (void *)end, -1, "initrd");
> +}
> +#endif

Given how trivial this is and how many architectures can use it I'd
reverse the polarity and add a CONFIG_HAVE_ARCH_FREE_INITRD_MEM
instead.