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Kernel: Add MADV_GET_VOLATILE for checking the volatile flag

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Sometimes you might want to know if a purgeable region is volatile.
This commit is contained in:
Andreas Kling
2019-12-18 20:48:24 +01:00
parent 1ad5568759
commit 487f9b373b
3 changed files with 8 additions and 0 deletions
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6
Kernel/Process.cpp
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@@ -363,6 +363,12 @@ int Process::sys$madvise(void* address, size_t size, int advice)
vmobject.set_was_purged(false);
return was_purged ? 1 : 0;
}
if (advice & MADV_GET_VOLATILE) {
if (!region->vmobject().is_purgeable())
return -EPERM;
auto& vmobject = static_cast<PurgeableVMObject&>(region->vmobject());
return vmobject.is_volatile() ? 0 : 1;
}
return -EINVAL;
}