path: root/Documentation/DMA-attributes.txt
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authorTorez Smith <lnxtorez@linux.vnet.ibm.com>2008-07-17 20:42:07 (GMT)
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2008-07-22 00:39:36 (GMT)
commit79e25bac124a7d1d7bf966f06dd9398a1b5f3d20 (patch)
treeaab261c7e4fc562cc21f81055ad8cab622bd2040 /Documentation/DMA-attributes.txt
parent542a3a3bc9d9c176f7cb332948df1cb8ff91fa64 (diff)
powerpc: Indicate which oprofile counters to use while in compat mode
While running on a system with new hardware and a kernel where the cpu_specs[] table does not recognize the new hardware, the identify_cpu() routine will select the default case as it searches through cpu_specs[] in an attempt to match the real PVR. Once the default case is selected, non of the oprofile counters and/or fields have been set up or defined. When identify_cpu() is called once more with the logical PVR, some of the cpu specific fields are replaced with the exception of the oprofile related ones. However, in the case where we have actually taken the default case while searching for the real PVR, we need to tell oprofile that we are now running in compatibility mode so it can pick up the correct counters. We do this by setting the oprofile_cpu_type field to be that taken from the cpu_specs[] for the cpu we are now emulating. This change will detect that we are now altering the real PVR and determine if we also need to update the oprofile_cpu_type field. Signed-off-by: Torez Smith <lnxtorez@linux.vnet.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'Documentation/DMA-attributes.txt')
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