Konrad Rzeszutek Wilk [off-list ref] writes:

On Sat, Jun 09, 2012 at 02:29:47PM +0530, Aneesh Kumar K.V wrote:

quoted

From: "Aneesh Kumar K.V" <redacted>

The current use of VM_FAULT_* codes with ERR_PTR requires us to ensure
VM_FAULT_* values will not exceed MAX_ERRNO value. Decouple the
VM_FAULT_* values from MAX_ERRNO.

I see you using the -ENOMEM|-ENOSPC, but I don't see any reference in the
code to MAX_ERRNO? Can you provide a comment explaining in a tad little
bit about the interaction of MAX_ERRNO and VM_FAULT?

That comes from this 

#define IS_ERR_VALUE(x) unlikely((x) >= (unsigned long)-MAX_ERRNO)


-aneesh

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