From: Pingfan Liu <piliu@xxxxxxxxxx>
This series addresses the nr_cpus issue for PowerPC without re-ordering
cpu number. To save the memory used by percpu area, it also limits the
possible cpu numbers by allowing hole in cpu_possible_mask.
Because the last cpu number will bigger than nr_cpu_ids in this way,
some pointer arrays indexed by cpu should be extended to hold the
pointer, e.g. paca_ptrs.
Please notice that this series still has some issue (some cpu can not be
brought up), but before I resolve it. Please share your thoughts about
it.
Thanks
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Cc: Nicholas Piggin <npiggin@xxxxxxxxx>
Cc: Christophe Leroy <christophe.leroy@xxxxxxxxxx>
Cc: Mahesh Salgaonkar <mahesh@xxxxxxxxxxxxx>
Cc: Wen Xiong <wenxiong@xxxxxxxxxx>
Cc: Baoquan He <bhe@xxxxxxxxxx>
Cc: Ming Lei <ming.lei@xxxxxxxxxx>
Cc: Sourabh Jain <sourabhjain@xxxxxxxxxxxxx>
Cc: Hari Bathini <hbathini@xxxxxxxxxxxxx>
Cc: kexec@xxxxxxxxxxxxxxxxxxx
To: linuxppc-dev@xxxxxxxxxxxxxxxx
Pingfan Liu (3):
powerpc/kernel: Remove check on paca_ptrs_size
powerpc/kernel: Extend arrays' size to make room for a hole in
cpu_possible_mask
powerpc/smp: Allow hole in paca_ptrs to accommodate boot_cpu
arch/powerpc/include/asm/paca.h | 2 ++
arch/powerpc/include/asm/smp.h | 1 +
arch/powerpc/kernel/paca.c | 24 +++++++-----------------
arch/powerpc/kernel/prom.c | 6 ++++++
arch/powerpc/kernel/setup-common.c | 26 +++++++++++++++++++++-----
arch/powerpc/kernel/smp.c | 3 ++-
6 files changed, 39 insertions(+), 23 deletions(-)
--
2.31.1
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