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Override Fault() method for VM{Device,Null}Cache to prevent vm_soft_fault()

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from inserting a clean page, if a fault happens. VMNullCaches are used by the
slab's memory manager -- all page faults in slab areas are serious bugs and
we want to panic() immediately.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@35748 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Ingo Weinhold 2010-03-03 22:08:47 +00:00
parent e4a0a9c2b4
commit 7263efe581
4 changed files with 24 additions and 4 deletions
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7
src/system/kernel/vm/VMDeviceCache.cpp
View File

@ -41,3 +41,10 @@ VMDeviceCache::Write(off_t offset, const iovec *vecs, size_t count,
// no place to write, this will cause the page daemon to skip this store // no place to write, this will cause the page daemon to skip this store
return B_OK; return B_OK;
} }
status_t
VMDeviceCache::Fault(struct VMAddressSpace* addressSpace, off_t offset)
{
return B_BAD_ADDRESS;
}

5
src/system/kernel/vm/VMDeviceCache.h
View File

@ -1,5 +1,5 @@
/* /*
* Copyright 2008-2009, Ingo Weinhold, ingo_weinhold@gmx.de. * Copyright 2008-2010, Ingo Weinhold, ingo_weinhold@gmx.de.
* Copyright 2005-2007, Axel Dörfler, axeld@pinc-software.de. * Copyright 2005-2007, Axel Dörfler, axeld@pinc-software.de.
* Distributed under the terms of the MIT License. * Distributed under the terms of the MIT License.
* *
@ -24,6 +24,9 @@ public:
virtual status_t Write(off_t offset, const iovec *vecs, size_t count, virtual status_t Write(off_t offset, const iovec *vecs, size_t count,
uint32 flags, size_t *_numBytes); uint32 flags, size_t *_numBytes);
virtual status_t Fault(struct VMAddressSpace* addressSpace,
off_t offset);
private: private:
addr_t fBaseAddress; addr_t fBaseAddress;
}; };

9
src/system/kernel/vm/VMNullCache.cpp
View File

@ -1,5 +1,5 @@
/* /*
* Copyright 2008, Ingo Weinhold, ingo_weinhold@gmx.de. * Copyright 2008-2010, Ingo Weinhold, ingo_weinhold@gmx.de.
* Distributed under the terms of the MIT License. * Distributed under the terms of the MIT License.
*/ */
@ -11,3 +11,10 @@ VMNullCache::Init(uint32 allocationFlags)
{ {
return VMCache::Init(CACHE_TYPE_NULL, allocationFlags); return VMCache::Init(CACHE_TYPE_NULL, allocationFlags);
} }
status_t
VMNullCache::Fault(struct VMAddressSpace* addressSpace, off_t offset)
{
return B_BAD_ADDRESS;
}

7
src/system/kernel/vm/VMNullCache.h
View File

@ -1,5 +1,5 @@
/* /*
* Copyright 2008-2009, Ingo Weinhold, ingo_weinhold@gmx.de. * Copyright 2008-2010, Ingo Weinhold, ingo_weinhold@gmx.de.
* Copyright 2005-2007, Axel Dörfler, axeld@pinc-software.de. * Copyright 2005-2007, Axel Dörfler, axeld@pinc-software.de.
* Distributed under the terms of the MIT License. * Distributed under the terms of the MIT License.
* *
@ -15,7 +15,10 @@
class VMNullCache : public VMCache { class VMNullCache : public VMCache {
public: public:
status_t Init(uint32 allocationFlags); status_t Init(uint32 allocationFlags);
virtual status_t Fault(struct VMAddressSpace* addressSpace,
off_t offset);
}; };