On Fri, 2010-01-22 at 16:19 +1300, Michael Neuling wrote: > > In message > <39fb8f1aeab9940b86c940b9a5f8e6bd41ec316c.1263368253.git.mich...@ell > erman.id.au> you wrote: > > On 64-bit kernels we currently have a 512 byte struct paca_struct for > > each cpu (usually just called "the paca"). Currently they are statically > > allocated, which means a kernel built for a large number of cpus will > > waste a lot of space if it's booted on a machine with few cpus. > > > > We can avoid that by only allocating the number of pacas we need at > > boot. However this is complicated by the fact that we need to access > > the paca before we know how many cpus there are in the system. > > > > The solution is to dynamically allocate enough space for NR_CPUS pacas, > > but then later in boot when we know how many cpus we have, we free any > > unused pacas. > > > > Lightly booted on Legacy iSeries & pSeries LPAR. > > This is broken on 32bit CPUs. Dies at compile time with > mpc86xx_defconfig. No paca on 32bit :-(
Bah, who really uses 32-bit anyway .. cheers
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