On Thu, Aug 31, 2017 at 06:27:31PM -0700, Linus Torvalds wrote:
> Why? That's no different from the case statement for the mmu case,
> just written differently.
Yes.
> You *want* existing kernels to fail, since they don't test the bits
> you want to test.
>
> So you just want to rewrite these all as
>
> switch (flags & MAP_TYPE) {
> case MAP_SHARED_VALIDATE:
> .. validate the other bits...
> /* fallhtough */
> case MAP_SHARED:
> .. do the shared case ..
> case MAP_PRIVATE:
> .. do the private case ..
> default:
> return -EINVAL;
> }
Btw, at least my original idea was to make MAP_VALIDATE a flag
instead of another mapping type, that is take it out of MAP_TYPE.
That being said this version is ok with me too - the chances of
needing a new type of private mappings probably isn't too big.
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