On Thu, 2010-01-14 at 11:26 +1100, Michael Neuling 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. > > > > Signed-off-by: Michael Ellerman <mich...@ellerman.id.au> > > Nice! > > <snip> > > > + lmb_free(__pa(paca) + new_size, paca_size - new_size); > > You didn't explicitly mention this above but this depends on your > lmb_free patch...
Ah yes, good point :) > FYI boots bare metal Sweet! Thanks for testing. cheers
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