From: Marc Zyngier maz@kernel.org
[ Upstream commit ed888cb0d1ebce69f12794e89fbd5e2c86d40b8d ]
Now that we allow CPUs affected by erratum 1418040 to come in late, this prevents their unaffected sibblings from coming in late (or coming back after a suspend or hotplug-off, which amounts to the same thing).
To allow this, we need to add ARM64_CPUCAP_OPTIONAL_FOR_LATE_CPU, which amounts to set .type to ARM64_CPUCAP_WEAK_LOCAL_CPU_FEATURE.
Fixes: bf87bb0881d0 ("arm64: Allow booting of late CPUs affected by erratum 1418040") Reported-by: Matthias Kaehlcke mka@chromium.org Signed-off-by: Marc Zyngier maz@kernel.org Tested-by: Sai Prakash Ranjan saiprakash.ranjan@codeaurora.org Tested-by: Matthias Kaehlcke mka@chromium.org Acked-by: Will Deacon will@kernel.org Link: https://lore.kernel.org/r/20200911181611.2073183-1-maz@kernel.org Signed-off-by: Catalin Marinas catalin.marinas@arm.com Signed-off-by: Sasha Levin sashal@kernel.org --- arch/arm64/kernel/cpu_errata.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/arch/arm64/kernel/cpu_errata.c b/arch/arm64/kernel/cpu_errata.c index 51462c59ab5da..d2e738c455566 100644 --- a/arch/arm64/kernel/cpu_errata.c +++ b/arch/arm64/kernel/cpu_errata.c @@ -917,8 +917,12 @@ const struct arm64_cpu_capabilities arm64_errata[] = { .desc = "ARM erratum 1418040", .capability = ARM64_WORKAROUND_1418040, ERRATA_MIDR_RANGE_LIST(erratum_1418040_list), - .type = (ARM64_CPUCAP_SCOPE_LOCAL_CPU | - ARM64_CPUCAP_PERMITTED_FOR_LATE_CPU), + /* + * We need to allow affected CPUs to come in late, but + * also need the non-affected CPUs to be able to come + * in at any point in time. Wonderful. + */ + .type = ARM64_CPUCAP_WEAK_LOCAL_CPU_FEATURE, }, #endif #ifdef CONFIG_ARM64_ERRATUM_1165522