6.8-stable review patch. If anyone has any objections, please let me know.
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From: Michael Ellerman mpe@ellerman.id.au
[ Upstream commit 777f81f0a9c780a6443bcf2c7785f0cc2e87c1ef ]
If nr_cpu_ids is too low to include the boot CPU adjust nr_cpu_ids upward. Otherwise the kernel will BUG when trying to allocate a paca for the boot CPU and fail to boot.
Cc: stable@vger.kernel.org Signed-off-by: Michael Ellerman mpe@ellerman.id.au Link: https://msgid.link/20231229120107.2281153-2-mpe@ellerman.id.au Signed-off-by: Sasha Levin sashal@kernel.org --- arch/powerpc/kernel/prom.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c index 58e80076bed5c..77364729a1b61 100644 --- a/arch/powerpc/kernel/prom.c +++ b/arch/powerpc/kernel/prom.c @@ -381,6 +381,12 @@ static int __init early_init_dt_scan_cpus(unsigned long node, nr_cpu_ids); }
+ if (boot_cpuid >= nr_cpu_ids) { + set_nr_cpu_ids(min(CONFIG_NR_CPUS, ALIGN(boot_cpuid + 1, nthreads))); + pr_warn("Boot CPU %d >= nr_cpu_ids, adjusted nr_cpu_ids to %d\n", + boot_cpuid, nr_cpu_ids); + } + /* * PAPR defines "logical" PVR values for cpus that * meet various levels of the architecture: