Re: [PATCH] Alternate futex non-page-pinning and COW fix

[Linus Torvalds]

On Thu, 4 Sep 2003, Jamie Lokier wrote:
> 
>   * I contend that the user-visible behaviour of a mapping should
>   * _not_ depend on whether the file was opened with O_RDWR or O_RDONLY.

And I violently agree. But I also add the _other_ requirement:

 * I contend that user-visible behaviour of a mapping should be 100% the 
 * same for a unwritable MAP_SHARED and a unwritten MAP_PRIVATE

Put the two together, and see what you get. You get the requirement that 
if MAP_SHARED works, then MAP_PRIVATE also has to work.

That's my requirement. Consistency.

		Linus



-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/