On 11/8/21 20:04, Michael Ellerman wrote:
Waiman Long <long...@redhat.com> writes:
It was found that the following warning message could be printed out when
booting the kernel on PowerPC systems that support LPAR:
[ 0.129584] WARNING: CPU: 0 PID: 1 at mm/memblock.c:1451
memblock_alloc_internal+0x5c/0x104
[ 0.129593] Modules linked in:
[ 0.129598] CPU: 0 PID: 1 Comm: swapper/0 Not tainted
5.14.0-11.el9.ppc64le+debug #1
[ 0.129605] NIP: c000000002040134 LR: c00000000204011c CTR: c0000000020241a8
[ 0.129610] REGS: c000000005637760 TRAP: 0700 Not tainted
(5.14.0-11.el9.ppc64le+debug)
[ 0.129616] MSR: 8000000002029033 <SF,VEC,EE,ME,IR,DR,RI,LE> CR: 48000222
XER: 00000002
[ 0.129635] CFAR: c0000000004d1cf4 IRQMASK: 0
[ 0.129635] GPR00: c00000000204011c c000000005637a00 c000000002c94d00
0000000000000001
[ 0.129635] GPR04: 0000000000000080 0000000000000000 0000000000000000
ffffffffffffffff
[ 0.129635] GPR08: 0000000000000000 0000000000000003 c00000000205ac64
0000000000080000
[ 0.129635] GPR12: 0000000000000000 c0000000049d0000 c000000000013078
0000000000000000
[ 0.129635] GPR16: 0000000000000000 0000000000000000 0000000000000000
0000000000000000
[ 0.129635] GPR20: 0000000000000000 0000000000000000 0000000000000000
0000000000000000
[ 0.129635] GPR24: c000000002003808 c00000000146f7b8 0000000000000000
0000000000000100
[ 0.129635] GPR28: c000000002d7cf80 0000000000000000 0000000000000008
0000000000000000
[ 0.129710] NIP [c000000002040134] memblock_alloc_internal+0x5c/0x104
[ 0.129717] LR [c00000000204011c] memblock_alloc_internal+0x44/0x104
[ 0.129723] Call Trace:
[ 0.129726] [c000000005637a00] [c000000005637a40] 0xc000000005637a40
(unreliable)
[ 0.129735] [c000000005637a60] [c0000000020404d8]
memblock_alloc_try_nid+0x94/0xcc
[ 0.129743] [c000000005637af0] [c00000000205ac64]
alloc_bootmem_cpumask_var+0x4c/0x9c
[ 0.129751] [c000000005637b60] [c0000000020242e0]
__machine_initcall_pseries_pseries_cpu_hotplug_init+0x138/0x1d8
[ 0.129760] [c000000005637bf0] [c000000000012404] do_one_initcall+0xa4/0x4f0
[ 0.129768] [c000000005637cd0] [c000000002005358] do_initcalls+0x140/0x18c
[ 0.129776] [c000000005637d80] [c0000000020055b8]
kernel_init_freeable+0x178/0x1d0
[ 0.129783] [c000000005637db0] [c0000000000130a0] kernel_init+0x30/0x190
[ 0.129790] [c000000005637e10] [c00000000000cef4]
ret_from_kernel_thread+0x5c/0x64
The warning is printed in memblock_alloc_internal() because the slab
has been initialized when the initcalls are being processed. To
avoid the warning, change alloc_bootmem_cpumask_var() call in
pseries_cpu_hotplug_init() to alloc_cpumask_var() instead. Also
change cpumask_or() to cpumask_copy() or we will have to use
zalloc_cpumask_var().
Fixes: bd1dd4c5f528 ("powerpc/pseries: Prevent free CPU ids being reused on another
node")
Signed-off-by: Waiman Long <long...@redhat.com>
---
arch/powerpc/platforms/pseries/hotplug-cpu.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
This looks similar to the patch Nick sent recently:
https://lore.kernel.org/linuxppc-dev/20211105132923.1582514-1-npig...@gmail.com/
I was not aware of Nick's patch. Since a fix is pending, I am
withdrawing mime.
Cheers,
Longman
