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watchdog/hardlockup: avoid large stack frames in watchdog_hardlockup_check()
After commit77c12fc959
("watchdog/hardlockup: add a "cpu" param to watchdog_hardlockup_check()") we started storing a `struct cpumask` on the stack in watchdog_hardlockup_check(). On systems with CONFIG_NR_CPUS set to 8192 this takes up 1K on the stack. That triggers warnings with `CONFIG_FRAME_WARN` set to 1024. We'll use the new trigger_allbutcpu_cpu_backtrace() to avoid needing to use a CPU mask at all. Link: https://lkml.kernel.org/r/20230804065935.v4.2.I501ab68cb926ee33a7c87e063d207abf09b9943c@changeid Fixes:77c12fc959
("watchdog/hardlockup: add a "cpu" param to watchdog_hardlockup_check()") Signed-off-by: Douglas Anderson <dianders@chromium.org> Reported-by: kernel test robot <lkp@intel.com> Closes: https://lore.kernel.org/r/202307310955.pLZDhpnl-lkp@intel.com Acked-by: Michal Hocko <mhocko@suse.com> Reviewed-by: Petr Mladek <pmladek@suse.com> Cc: Lecopzer Chen <lecopzer.chen@mediatek.com> Cc: Pingfan Liu <kernelfans@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
parent
8d539b84f1
commit
1f38c86bb2
1 changed files with 2 additions and 7 deletions
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@ -151,9 +151,6 @@ void watchdog_hardlockup_check(unsigned int cpu, struct pt_regs *regs)
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*/
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if (is_hardlockup(cpu)) {
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unsigned int this_cpu = smp_processor_id();
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struct cpumask backtrace_mask;
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cpumask_copy(&backtrace_mask, cpu_online_mask);
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/* Only print hardlockups once. */
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if (per_cpu(watchdog_hardlockup_warned, cpu))
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@ -167,10 +164,8 @@ void watchdog_hardlockup_check(unsigned int cpu, struct pt_regs *regs)
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show_regs(regs);
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else
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dump_stack();
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cpumask_clear_cpu(cpu, &backtrace_mask);
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} else {
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if (trigger_single_cpu_backtrace(cpu))
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cpumask_clear_cpu(cpu, &backtrace_mask);
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trigger_single_cpu_backtrace(cpu);
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}
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/*
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@ -179,7 +174,7 @@ void watchdog_hardlockup_check(unsigned int cpu, struct pt_regs *regs)
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*/
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if (sysctl_hardlockup_all_cpu_backtrace &&
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!test_and_set_bit(0, &watchdog_hardlockup_all_cpu_dumped))
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trigger_cpumask_backtrace(&backtrace_mask);
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trigger_allbutcpu_cpu_backtrace(cpu);
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if (hardlockup_panic)
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nmi_panic(regs, "Hard LOCKUP");
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