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authorPaul Mackerras <paulus@samba.org>2006-04-18 07:49:11 -0400
committerPaul Mackerras <paulus@samba.org>2006-04-18 07:49:11 -0400
commitf39224a8c1828bdd327539da72a53d8a13595838 (patch)
treecc9e9139e2e7e2e36774e5c52a5311439160633c /arch/ppc
parent183b73ae7c9e4e19fa95d88e1778481899a65210 (diff)
powerpc: Use correct sequence for putting CPU into nap mode
We weren't using the recommended sequence for putting the CPU into nap mode. When I changed the idle loop, for some reason 7447A cpus started hanging when we put them into nap mode. Changing to the recommended sequence fixes that. The complexity here is that the recommended sequence is a loop that keeps putting the cpu back into nap mode. Clearly we need some way to break out of the loop when an interrupt (external interrupt, decrementer, performance monitor) occurs. Here we use a bit in the thread_info struct to indicate that we need this, and the exception entry code notices this and arranges for the exception to return to the value in the link register, thus breaking out of the loop. We use a new `local_flags' field in the thread_info which we can alter without needing to use an atomic update sequence. The PPC970 has the same recommended sequence, so we do the same thing there too. This also fixes a bug in the kernel stack overflow handling code on 32-bit, since it was causing a value that we needed in a register to get trashed. Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/ppc')
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