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authorPaul Mackerras <paulus@samba.org>2009-08-17 14:36:32 +1000
committerPaul Mackerras <paulus@samba.org>2009-08-18 14:48:39 +1000
commit1660e9d3d04b6c636b7171bf6c08ac7b82a7de79 (patch)
tree9a402e3cbe5613ecb6d8f1ee762dd760ae57a38a /arch/powerpc/mm
parent64f1607ffbbc772685733ea63e6f7f4183df1b16 (diff)
powerpc/32: Always order writes to halves of 64-bit PTEs
On 32-bit systems with 64-bit PTEs, the PTEs have to be written in two 32-bit halves. On SMP we write the higher-order half and then the lower-order half, with a write barrier between the two halves, but on UP there was no particular ordering of the writes to the two halves. This extends the ordering that we already do on SMP to the UP case as well. The reason is that with the perf_counter subsystem potentially accessing user memory at interrupt time to get stack traces, we have to be careful not to create an incorrect but apparently valid PTE even on UP. Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc/mm')
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