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FROMGIT: ARM: Handle no IPI being registered in show_ipi_list()

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As SMP-on-UP is a valid configuration on 32bit ARM, do not assume that
IPIs are populated in show_ipi_list().

Reported-by: Guillaume Tucker <guillaume.tucker@collabora.com>
Reported-by: kernelci.org bot <bot@kernelci.org>
Tested-by: Guillaume Tucker <guillaume.tucker@collabora.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>

Bug: 140053385
(cherry picked from commit 220387048d
 https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git irq/ipi-as-irq)
Change-Id: Ic34d58cf86c1cc3c233567a572fe96861dd8139f
Signed-off-by: Eric Biggers <ebiggers@google.com>
This commit is contained in:
Marc Zyngier
2020-09-25 16:22:00 +01:00
committed by Eric Biggers
parent 207021f2ce
commit c6ed9c53ba
1 changed files with 6 additions and 1 deletions
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7
arch/arm/kernel/smp.c
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@@ -541,7 +541,12 @@ void show_ipi_list(struct seq_file *p, int prec)
unsigned int cpu, i;
for (i = 0; i < NR_IPI; i++) {
unsigned int irq = irq_desc_get_irq(ipi_desc[i]);
unsigned int irq;
if (!ipi_desc[i])
continue;
irq = irq_desc_get_irq(ipi_desc[i]);
seq_printf(p, "%*s%u: ", prec - 1, "IPI", i);
for_each_online_cpu(cpu)