> 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>
<snip> > --- a/arch/powerpc/kernel/setup-common.c > +++ b/arch/powerpc/kernel/setup-common.c > @@ -493,6 +493,8 @@ void __init smp_setup_cpu_maps(void) > * here will have to be reworked > */ > cpu_init_thread_core_maps(nthreads); > + > + free_unused_pacas(); This is still barfing for me on 32bit. Putting an #include <asm/paca.h> at the top of setup-common.c fixes it. Mikey _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
