Messages in this thread | | | Date | Wed, 30 May 2012 23:50:18 -0700 (PDT) | From | David Rientjes <> | Subject | Re: [PATCH -V7 02/14] hugetlbfs: don't use ERR_PTR with VM_FAULT* values |
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On Thu, 31 May 2012, Aneesh Kumar K.V wrote:
> > Yeah, but is there a reason for using VM_FAULT_HWPOISON_LARGE_MASK since > > that's the only VM_FAULT_* value that is greater than MAX_ERRNO? The rest > > of your patch set doesn't require this, so I think this change should just > > be dropped. (And PTR_ERR() still returns long, this wasn't fixed from my > > original review.) > > > > The changes was done as per Andrew's request so that we don't have such hidden > dependencies on the values of VM_FAULT_*. Yes it can be a seperate patch from > the patchset. I have changed int to long as per your review. >
I think it confuscates the code, can't we just add something like BUILD_BUG_ON() to ensure that PTR_ERR() never uses values that are outside the bounds of MAX_ERRNO so we'll catch these at compile time if mm/hugetlb.c or anything else is ever extended to use such values?
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