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/
cheers
