Re: [PATCH 0/4] mm: permit guard regions for file-backed/shmem mappings

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See mlock2();

SYSCALL_DEFINE3(mlock2, unsigned long, start, size_t, len, int, flags) { vm_flags_t vm_flags = VM_LOCKED;

if (flags & ~MLOCK_ONFAULT) return -EINVAL;

if (flags & MLOCK_ONFAULT) vm_flags |= VM_LOCKONFAULT;

return do_mlock(start, len, vm_flags); }

VM_LOCKONFAULT always as VM_LOCKED set as well.

OK cool, that makes sense.

As with much kernel stuff, I knew this in the past. Then I forgot. Then I knew again, then... :P if only somebody would write it down in a book...

And if there would be such a book in the makings, I would consider hurrying up and preordering it ;)