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[PW_SID:1127762] [v2] riscv: smp: set CPU 0 possible in setup_smp()#2284

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[PW_SID:1127762] [v2] riscv: smp: set CPU 0 possible in setup_smp()#2284
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@linux-riscv-bot linux-riscv-bot commented Jul 14, 2026

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PR for series 1127762 applied to workflow__riscv__fixes

Name: [v2] riscv: smp: set CPU 0 possible in setup_smp()
URL: https://patchwork.kernel.org/project/linux-riscv/list/?series=1127762
Version: 2

Linux RISC-V bot and others added 2 commits July 13, 2026 20:05
Adding CI files
f54dc6c
riscv: smp: set CPU 0 possible in setup_smp()
2befd34 
setup_smp() calls set_cpu_possible() for CPUs 1..nr_cpu_ids-1 but
never for CPU 0 (the boot CPU). x86 handles this via
init_cpu_possible(cpumask_of(0)); RISC-V has no equivalent.

Without CPU 0 in cpu_possible_mask, rcu_init_one()'s
for_each_possible_cpu() loop skips it, leaving rdp->mynode=NULL.
rcutree_prepare_cpu() then dereferences NULL and hangs.

Exposed on Sophgo SG2042 (64-hart, 4-NUMA) with Linux 7.2-rc3.

Fixes: a4166ae ("riscv: Deduplicate code in setup_smp()")
Signed-off-by: Paul Sherman <shermanpauldylan@gmail.com>
Signed-off-by: Linux RISC-V bot <linux.riscv.bot@gmail.com>
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Patch 1: "[v2] riscv: smp: set CPU 0 possible in setup_smp()"
build-rv32-defconfig
Desc: Builds riscv32 defconfig
Duration: 140.86 seconds
Result: PASS

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linux-riscv-bot commented Jul 14, 2026

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Patch 1: "[v2] riscv: smp: set CPU 0 possible in setup_smp()"
build-rv64-clang-allmodconfig
Desc: Builds riscv64 allmodconfig with Clang, and checks for errors and added warnings
Duration: 1429.83 seconds
Result: PASS

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linux-riscv-bot commented Jul 14, 2026

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Patch 1: "[v2] riscv: smp: set CPU 0 possible in setup_smp()"
build-rv64-gcc-allmodconfig
Desc: Builds riscv64 allmodconfig with GCC, and checks for errors and added warnings
Duration: 1674.72 seconds
Result: PASS

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linux-riscv-bot commented Jul 14, 2026

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Patch 1: "[v2] riscv: smp: set CPU 0 possible in setup_smp()"
build-rv64-nommu-k210-defconfig
Desc: Builds riscv64 defconfig with NOMMU for K210
Duration: 25.71 seconds
Result: PASS

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linux-riscv-bot commented Jul 14, 2026

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Patch 1: "[v2] riscv: smp: set CPU 0 possible in setup_smp()"
build-rv64-nommu-k210-virt
Desc: Builds riscv64 defconfig with NOMMU for the virt platform
Duration: 27.08 seconds
Result: PASS

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linux-riscv-bot commented Jul 14, 2026

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Patch 1: "[v2] riscv: smp: set CPU 0 possible in setup_smp()"
checkpatch
Desc: Runs checkpatch.pl on the patch
Duration: 0.76 seconds
Result: PASS

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linux-riscv-bot commented Jul 14, 2026

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Patch 1: "[v2] riscv: smp: set CPU 0 possible in setup_smp()"
dtb-warn-rv64
Desc: Checks for Device Tree warnings/errors
Duration: 86.02 seconds
Result: PASS

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linux-riscv-bot commented Jul 14, 2026

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Patch 1: "[v2] riscv: smp: set CPU 0 possible in setup_smp()"
header-inline
Desc: Detects static functions without inline keyword in header files
Duration: 0.24 seconds
Result: PASS

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linux-riscv-bot commented Jul 14, 2026

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Patch 1: "[v2] riscv: smp: set CPU 0 possible in setup_smp()"
kdoc
Desc: Detects for kdoc errors
Duration: 0.85 seconds
Result: PASS

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linux-riscv-bot commented Jul 14, 2026

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Patch 1: "[v2] riscv: smp: set CPU 0 possible in setup_smp()"
module-param
Desc: Detect module_param changes
Duration: 0.26 seconds
Result: PASS

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linux-riscv-bot commented Jul 14, 2026

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Patch 1: "[v2] riscv: smp: set CPU 0 possible in setup_smp()"
verify-fixes
Desc: Verifies that the Fixes: tags exist
Duration: 0.29 seconds
Result: PASS

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linux-riscv-bot commented Jul 14, 2026

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Patch 1: "[v2] riscv: smp: set CPU 0 possible in setup_smp()"
verify-signedoff
Desc: Verifies that Signed-off-by: tags are correct
Duration: 0.31 seconds
Result: PASS

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linux-riscv-bot force-pushed the workflow__riscv__fixes branch from f54dc6c to f61148d Compare July 15, 2026 03:51
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linux-riscv-bot deleted the pw1127762 branch July 15, 2026 03:52
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