On Friday 20 November 2015 09:31:33 Dan Williams wrote:
> This effectively promotes IORESOURCE_BUSY to IORESOURCE_EXCLUSIVE
> semantics by default. If userspace really believes it is safe to access
> the memory region it can also perform the extra step of disabling an
> active driver. This protects device address ranges with read side
> effects and otherwise directs userspace to use the driver.
>
> Persistent memory presents a large "mistake surface" to /dev/mem as now
> accidental writes can corrupt a filesystem.
>
> Cc: Kees Cook <[email protected]>
> Cc: Russell King <[email protected]>
> Cc: Catalin Marinas <[email protected]>
> Cc: Will Deacon <[email protected]>
> Cc: Benjamin Herrenschmidt <[email protected]>
> Cc: Martin Schwidefsky <[email protected]>
> Cc: Heiko Carstens <[email protected]>
> Cc: Thomas Gleixner <[email protected]>
> Cc: Ingo Molnar <[email protected]>
> Cc: "H. Peter Anvin" <[email protected]>
> Cc: Andrew Morton <[email protected]>
> Cc: Greg Kroah-Hartman <[email protected]>
> Signed-off-by: Dan Williams <[email protected]>
>
I like the idea.
Maybe split the change up into two patches, where the first one
just does the trivial move of the Kconfig option, and the second
one that changes behavior is small?
There is also a question of whether we actually need two options
or if we can safely make the existing option stricter.
Arnd
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