From: Pingfan Liu <kernelfans@gmail•com>
To: linuxppc-dev@lists•ozlabs.org
Cc: Baoquan He <bhe@redhat•com>, Pingfan Liu <piliu@redhat•com>,
kexec@lists•infradead.org,
Mahesh Salgaonkar <mahesh@linux•ibm.com>,
Ming Lei <ming.lei@redhat•com>,
Nicholas Piggin <npiggin@gmail•com>,
Sourabh Jain <sourabhjain@linux•ibm.com>,
Hari Bathini <hbathini@linux•ibm.com>,
Wen Xiong <wenxiong@us•ibm.com>
Subject: [PATCHv10 0/3] enable nr_cpus for powerpc without re-ordering cpu number
Date: Wed, 27 Dec 2023 10:39:31 +0800 [thread overview]
Message-ID: <20231227023934.12299-1-kernelfans@gmail.com> (raw)
From: Pingfan Liu <piliu@redhat•com>
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@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 (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
next reply other threads:[~2023-12-27 2:40 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-12-27 2:39 Pingfan Liu [this message]
2023-12-27 2:39 ` [PATCHv10 1/3] powerpc/kernel: Remove check on paca_ptrs_size Pingfan Liu
2023-12-27 2:41 ` [PATCHv10 2/3] powerpc/kernel: Extend arrays' size to make room for a hole in cpu_possible_mask Pingfan Liu
2023-12-27 19:52 ` kernel test robot
2023-12-27 2:41 ` [PATCHv10 3/3] powerpc/smp: Allow hole in paca_ptrs to accommodate boot_cpu Pingfan Liu
2023-12-27 20:45 ` kernel test robot
2023-12-28 4:07 ` kernel test robot
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