On Tue, 2015-10-06 at 16:10 +0200, Christophe Leroy wrote: > Le 29/09/2015 01:58, Scott Wood a écrit : > > On Tue, Sep 22, 2015 at 06:50:50PM +0200, Christophe Leroy wrote: > > > On recent kernels, with some debug options like for instance > > > CONFIG_LOCKDEP, the BSS requires more than 8M memory, allthough > > > the kernel code fits in the first 8M. > > > Today, it is necessary to activate CONFIG_PIN_TLB to get more than 8M > > > at startup, allthough pinning TLB is not necessary for that. > > > > > > This patch adds a second 8M page to the initial mapping in order to > > > have 16M mapped regardless of CONFIG_PIN_TLB, like several other > > > 32 bits PPC (40x, 601, ...) > > > > > > Signed-off-by: Christophe Leroy <christophe.le...@c-s.fr> > > > --- > > Is the assumption that nobody is still running 8xx systems with only 8 > > MiB RAM on current kernels? > > > > > No, setup_initial_memory_limit() limits the memory to the minimum > between 16M and the real memory size, so if a platform has only 8M, it > will still be limited to 8M even with 16M mapped.
And you just hope you don't get a speculative fetch from the second 8M? -Scott _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
