* [tip:timers/core] BUILD SUCCESS WITH UNVERIFIED WARNING 7dec062cfcf27808dbb70a0b231d1a698792743d
@ 2025-11-22 7:20 kernel test robot
2025-11-22 15:43 ` Thomas Gleixner
0 siblings, 1 reply; 2+ messages in thread
From: kernel test robot @ 2025-11-22 7:20 UTC (permalink / raw)
To: x86-ml; +Cc: linux-kernel
tree/branch: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git timers/core
branch HEAD: 7dec062cfcf27808dbb70a0b231d1a698792743d timers/migration: Exclude isolated cpus from hierarchy
Unverified Warning (likely false positive, kindly check if interested):
kernel/time/timer_migration.c:1866 tmigr_setup_groups() error: we previously assumed 'start' could be null (see line 1764)
Warning ids grouped by kconfigs:
recent_errors
`-- arm64-randconfig-r071-20251122
`-- kernel-time-timer_migration.c-tmigr_setup_groups()-error:we-previously-assumed-start-could-be-null-(see-line-)
elapsed time: 2095m
configs tested: 99
configs skipped: 3
tested configs:
alpha allnoconfig gcc-15.1.0
alpha defconfig gcc-15.1.0
arc allnoconfig gcc-15.1.0
arc randconfig-001-20251121 gcc-8.5.0
arc randconfig-002-20251121 gcc-13.4.0
arm allnoconfig clang-22
arm randconfig-001-20251121 gcc-10.5.0
arm randconfig-002-20251121 gcc-11.5.0
arm randconfig-003-20251121 clang-22
arm randconfig-004-20251121 gcc-10.5.0
arm64 allnoconfig gcc-15.1.0
arm64 randconfig-001-20251122 gcc-8.5.0
arm64 randconfig-002-20251122 gcc-9.5.0
arm64 randconfig-003-20251122 gcc-10.5.0
arm64 randconfig-004-20251122 clang-22
csky allnoconfig gcc-15.1.0
csky randconfig-001-20251122 gcc-15.1.0
csky randconfig-002-20251122 gcc-14.3.0
hexagon allnoconfig clang-22
hexagon randconfig-001-20251121 clang-22
hexagon randconfig-002-20251121 clang-22
i386 allnoconfig gcc-14
i386 buildonly-randconfig-001-20251122 clang-20
i386 buildonly-randconfig-002-20251122 clang-20
i386 buildonly-randconfig-003-20251122 gcc-14
i386 buildonly-randconfig-004-20251122 clang-20
i386 buildonly-randconfig-005-20251122 clang-20
i386 buildonly-randconfig-006-20251122 clang-20
i386 randconfig-001-20251122 clang-20
i386 randconfig-002-20251122 gcc-13
i386 randconfig-003-20251122 clang-20
i386 randconfig-004-20251122 clang-20
i386 randconfig-005-20251122 clang-20
i386 randconfig-006-20251122 clang-20
i386 randconfig-007-20251122 clang-20
loongarch allnoconfig clang-22
loongarch defconfig clang-19
loongarch randconfig-001-20251121 gcc-15.1.0
loongarch randconfig-002-20251121 clang-22
m68k allnoconfig gcc-15.1.0
m68k defconfig gcc-15.1.0
microblaze allnoconfig gcc-15.1.0
microblaze defconfig gcc-15.1.0
mips allnoconfig gcc-15.1.0
mips rb532_defconfig clang-18
nios2 allnoconfig gcc-11.5.0
nios2 defconfig gcc-11.5.0
nios2 randconfig-001-20251121 gcc-11.5.0
nios2 randconfig-002-20251121 gcc-8.5.0
openrisc allnoconfig gcc-15.1.0
openrisc defconfig gcc-15.1.0
parisc allnoconfig gcc-15.1.0
parisc defconfig gcc-15.1.0
parisc64 defconfig gcc-15.1.0
powerpc allnoconfig gcc-15.1.0
powerpc chrp32_defconfig clang-19
powerpc mpc834x_itxgp_defconfig clang-22
powerpc ps3_defconfig gcc-15.1.0
riscv allnoconfig gcc-15.1.0
riscv defconfig clang-22
riscv randconfig-001-20251122 clang-22
riscv randconfig-002-20251122 clang-22
s390 allnoconfig clang-22
s390 defconfig clang-22
s390 randconfig-001-20251122 clang-16
s390 randconfig-002-20251122 gcc-13.4.0
sh allnoconfig gcc-15.1.0
sh defconfig gcc-15.1.0
sh hp6xx_defconfig gcc-15.1.0
sh randconfig-001-20251122 gcc-15.1.0
sh randconfig-002-20251122 gcc-10.5.0
sh sh03_defconfig gcc-15.1.0
sparc allnoconfig gcc-15.1.0
sparc defconfig gcc-15.1.0
sparc randconfig-001-20251121 gcc-13.4.0
sparc randconfig-002-20251121 gcc-8.5.0
sparc64 defconfig clang-20
sparc64 randconfig-001-20251121 clang-22
sparc64 randconfig-002-20251121 clang-22
um allnoconfig clang-22
um defconfig clang-22
um i386_defconfig gcc-14
um randconfig-001-20251121 clang-22
um randconfig-002-20251121 gcc-14
um x86_64_defconfig clang-22
x86_64 allnoconfig clang-20
x86_64 buildonly-randconfig-001-20251122 gcc-14
x86_64 buildonly-randconfig-002-20251122 gcc-14
x86_64 buildonly-randconfig-003-20251122 gcc-14
x86_64 buildonly-randconfig-004-20251122 clang-20
x86_64 buildonly-randconfig-005-20251122 gcc-14
x86_64 buildonly-randconfig-006-20251122 gcc-13
x86_64 defconfig gcc-14
x86_64 randconfig-071-20251122 gcc-14
x86_64 randconfig-072-20251122 gcc-14
x86_64 randconfig-074-20251122 gcc-14
xtensa allnoconfig gcc-15.1.0
xtensa randconfig-001-20251121 gcc-11.5.0
xtensa randconfig-002-20251121 gcc-8.5.0
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [tip:timers/core] BUILD SUCCESS WITH UNVERIFIED WARNING 7dec062cfcf27808dbb70a0b231d1a698792743d
2025-11-22 7:20 [tip:timers/core] BUILD SUCCESS WITH UNVERIFIED WARNING 7dec062cfcf27808dbb70a0b231d1a698792743d kernel test robot
@ 2025-11-22 15:43 ` Thomas Gleixner
0 siblings, 0 replies; 2+ messages in thread
From: Thomas Gleixner @ 2025-11-22 15:43 UTC (permalink / raw)
To: kernel test robot, x86-ml; +Cc: linux-kernel, Frederic Weisbecker
On Sat, Nov 22 2025 at 15:20, kernel test robot wrote:
> tree/branch: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git timers/core
> branch HEAD: 7dec062cfcf27808dbb70a0b231d1a698792743d timers/migration: Exclude isolated cpus from hierarchy
>
> Unverified Warning (likely false positive, kindly check if interested):
>
> kernel/time/timer_migration.c:1866 tmigr_setup_groups() error: we previously assumed 'start' could be null (see line 1764)
Yes, the code is prone to that problem, but the two callers do the right
thing. Though this can be simplified.
Thanks
tglx
---
kernel/time/timer_migration.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
--- a/kernel/time/timer_migration.c
+++ b/kernel/time/timer_migration.c
@@ -1750,12 +1750,12 @@ static void tmigr_connect_child_parent(s
trace_tmigr_connect_child_parent(child);
}
-static int tmigr_setup_groups(unsigned int cpu, unsigned int node,
- struct tmigr_group *start, bool activate)
+static int tmigr_setup_groups(unsigned int cpu, unsigned int node, struct tmigr_group *start)
{
struct tmigr_group *group, *child, **stack;
int i, top = 0, err = 0, start_lvl = 0;
bool root_mismatch = false;
+ bool activate = false;
stack = kcalloc(tmigr_hierarchy_levels, sizeof(*stack), GFP_KERNEL);
if (!stack)
@@ -1764,6 +1764,7 @@ static int tmigr_setup_groups(unsigned i
if (start) {
stack[start->level] = start;
start_lvl = start->level + 1;
+ activate = true;
}
if (tmigr_root)
@@ -1893,7 +1894,7 @@ static int tmigr_add_cpu(unsigned int cp
guard(mutex)(&tmigr_mutex);
- ret = tmigr_setup_groups(cpu, node, NULL, false);
+ ret = tmigr_setup_groups(cpu, node, NULL);
/* Root has changed? Connect the old one to the new */
if (ret >= 0 && old_root && old_root != tmigr_root) {
@@ -1910,7 +1911,7 @@ static int tmigr_add_cpu(unsigned int cp
* otherwise the old root may not be active as expected.
*/
WARN_ON_ONCE(!per_cpu_ptr(&tmigr_cpu, raw_smp_processor_id())->available);
- ret = tmigr_setup_groups(-1, old_root->numa_node, old_root, true);
+ ret = tmigr_setup_groups(-1, old_root->numa_node, old_root);
}
return ret;
^ permalink raw reply [flat|nested] 2+ messages in thread
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2025-11-22 7:20 [tip:timers/core] BUILD SUCCESS WITH UNVERIFIED WARNING 7dec062cfcf27808dbb70a0b231d1a698792743d kernel test robot
2025-11-22 15:43 ` Thomas Gleixner
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