[PATCHv9 0/2] enable nr_cpus for powerpc

[Pingfan Liu <piliu@redhat.com>]

From: Pingfan Liu <kernelfans@gmail.com>


Since my last v4 [1], the code has undergone great changes. The paca[]
array has been reorganized and indexed by paca_ptrs[], which
dramatically decreases the memory consumption even if there are many
unpresent cpus in the middle.

However, reordering the logical cpu numbers can further decrease the
size of paca_ptrs[] in the kdump case. These two patches rotate-shifts
the cpu's sequence number in the device tree to obtain the logical cpu
id.


[1]: https://lore.kernel.org/linuxppc-dev/1520829790-14029-1-git-send-email-kernelfans@gmail.com/
---
v8 -> v9
  put aside [3-5/5] in v8 for the time being, which complicates the code.
  optimize out some unnecessary initialization according to Hari's
suggestion

Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: Mahesh Salgaonkar <mahesh@linux.ibm.com>
Cc: Wen Xiong <wenxiong@us.ibm.com>
Cc: Baoquan He <bhe@redhat.com>
Cc: Ming Lei <ming.lei@redhat.com>
Cc: Sourabh Jain <sourabhjain@linux.ibm.com>
Cc: Hari Bathini <hbathini@linux.ibm.com>
Cc: kexec@lists.infradead.org
To: linuxppc-dev@lists.ozlabs.org

Pingfan Liu (2):
  powerpc/setup : Enable boot_cpu_hwid for PPC32
  powerpc/setup: Loosen the mapping between cpu logical id and its seq
    in dt

 arch/powerpc/include/asm/smp.h     |  2 +-
 arch/powerpc/kernel/prom.c         | 26 +++++----
 arch/powerpc/kernel/setup-common.c | 86 +++++++++++++++++++++++-------
 3 files changed, 83 insertions(+), 31 deletions(-)

-- 
2.31.1