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Srikar Dronamraju 10f78fd0da powerpc/numa: Fix a regression on memoryless node 0 
Commit e75130f20b ("powerpc/numa: Offline memoryless cpuless node 0")
offlines node 0 and expects nodes to be subsequently onlined when CPUs
or nodes are detected.

Commit 6398eaa268 ("powerpc/numa: Prefer node id queried from vphn")
skips onlining node 0 when CPUs are associated with node 0.

On systems with node 0 having CPUs but no memory, this causes node 0 be
marked offline. This causes issues at boot time when trying to set
memory node for online CPUs while building the zonelist.

0:mon> t
[link register   ] c000000000400354 __build_all_zonelists+0x164/0x280
[c00000000161bda0] c0000000016533c8 node_states+0x20/0xa0 (unreliable)
[c00000000161bdc0] c000000000400384 __build_all_zonelists+0x194/0x280
[c00000000161be30] c000000001041800 build_all_zonelists_init+0x4c/0x118
[c00000000161be80] c0000000004020d0 build_all_zonelists+0x190/0x1b0
[c00000000161bef0] c000000001003cf8 start_kernel+0x18c/0x6a8
[c00000000161bf90] c00000000000adb4 start_here_common+0x1c/0x3e8
0:mon> r
R00 = c000000000400354   R16 = 000000000b57a0e8
R01 = c00000000161bda0   R17 = 000000000b57a6b0
R02 = c00000000161ce00   R18 = 000000000b5afee8
R03 = 0000000000000000   R19 = 000000000b6448a0
R04 = 0000000000000000   R20 = fffffffffffffffd
R05 = 0000000000000000   R21 = 0000000001400000
R06 = 0000000000000000   R22 = 000000001ec00000
R07 = 0000000000000001   R23 = c000000001175580
R08 = 0000000000000000   R24 = c000000001651ed8
R09 = c0000000017e84d8   R25 = c000000001652480
R10 = 0000000000000000   R26 = c000000001175584
R11 = c000000c7fac0d10   R27 = c0000000019568d0
R12 = c000000000400180   R28 = 0000000000000000
R13 = c000000002200000   R29 = c00000000164dd78
R14 = 000000000b579f78   R30 = 0000000000000000
R15 = 000000000b57a2b8   R31 = c000000001175584
pc  = c000000000400194 local_memory_node+0x24/0x80
cfar= c000000000074334 mcount+0xc/0x10
lr  = c000000000400354 __build_all_zonelists+0x164/0x280
msr = 8000000002001033   cr  = 44002284
ctr = c000000000400180   xer = 0000000000000001   trap =  380
dar = 0000000000001388   dsisr = c00000000161bc90
0:mon>

Fix this by setting node to be online while onlining CPUs that belong to
node 0.

Fixes: e75130f20b ("powerpc/numa: Offline memoryless cpuless node 0")
Fixes: 6398eaa268 ("powerpc/numa: Prefer node id queried from vphn")
Reported-by: Milan Mohanty <milmohan@in.ibm.com>
Signed-off-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20201127053738.10085-1-srikar@linux.vnet.ibm.com
 		2020-11-27 22:06:21 +11:00
Documentation powerpc/64s: flush L1D after user accesses 2020-11-19 23:47:18 +11:00
LICENSES LICENSES/deprecated: add Zlib license text 2020-09-16 14:33:49 +02:00
arch powerpc/numa: Fix a regression on memoryless node 0 2020-11-27 22:06:21 +11:00
block blk-mq: mark flush request as IDLE in flush_end_io() 2020-10-30 08:33:49 -06:00
certs .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
crypto drivers-5.10-2020-10-12 2020-10-13 13:04:41 -07:00
drivers Char/Misc fixes/removals for 5.10-rc2 2020-11-01 10:05:16 -08:00
fs Driver core / Documentation fixes for 5.10-rc2 2020-11-01 09:59:13 -08:00
include A few fixes for timers/timekeeping: 2020-11-01 11:13:45 -08:00
init linux-kselftest-kunit-5.10-rc1 2020-10-18 14:45:59 -07:00
ipc ipc: adjust proc_ipc_sem_dointvec definition to match prototype 2020-09-05 12:14:29 -07:00
kernel kernel/cpu: add arch override for clear_tasks_mm_cpumask() mm handling 2020-11-27 00:10:39 +11:00
lib Driver core / Documentation fixes for 5.10-rc2 2020-11-01 09:59:13 -08:00
mm mm/process_vm_access: Add missing #include <linux/compat.h> 2020-10-27 12:41:29 -07:00
net flexible-array member conversion patches for 5.10-rc2 2020-10-31 14:31:28 -07:00
samples misc: mic: remove the MIC drivers 2020-10-28 19:12:03 +01:00
scripts scripts: get_abi.pl: assume ReST format by default 2020-10-30 13:16:03 +01:00
security ima: Replace zero-length array with flexible-array member 2020-10-29 17:22:59 -05:00
sound ARM: SoC platform updates 2020-10-24 10:33:08 -07:00
tools selftests/powerpc: refactor entry and rfi_flush tests 2020-11-19 23:47:23 +11:00
usr Merge branch 'work.fdpic' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2020-08-07 13:29:39 -07:00
virt kvm: x86/mmu: Support dirty logging for the TDP MMU 2020-10-23 03:42:13 -04:00
.clang-format RDMA 5.10 pull request 2020-10-17 11:18:18 -07:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore Opt out of scripts/get_maintainer.pl 2019-05-16 10:53:40 -07:00
.gitattributes .gitattributes: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore .gitignore: docs: ignore sphinx_*/ directories 2020-09-10 10:44:31 -06:00
.mailmap MAINTAINERS: jarkko.sakkinen@linux.intel.com -> jarkko@kernel.org 2020-10-16 11:11:19 -07:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: Move Sangbeom Kim to credits 2020-10-26 10:11:18 +01:00
Kbuild kbuild: rename hostprogs-y/always to hostprogs/always-y 2020-02-04 01:53:07 +09:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS Char/Misc fixes/removals for 5.10-rc2 2020-11-01 10:05:16 -08:00
Makefile Linux 5.10-rc2 2020-11-01 14:43:51 -08:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -06:00

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.