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Subject: Re: make PROT_WRITE imply PROT_READ
From: Arjan van de Ven <arjan@infradead.org>
To: Pavel Machek <pavel@ucw.cz>
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> Well, some hardware can probably support write-only, and such support
> can be useful for "weird" applications, such as just-in-time
> compilers, etc.

it also makes sense for PCI MMIO mappings..