> 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... FYI boots bare metal Mikey _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
