From 506ada89629ec7059b96ecfb0dc7d33ece0103ca Mon Sep 17 00:00:00 2001 From: Eduard Zingerman Date: Fri, 4 Sep 2026 17:05:56 -0700 Subject: bpf: mark a NULL kfunc argument precise check_kfunc_arg() allows bpf_register_is_null() for nullable arguments w/o marking the underlying scalar register precise. Hence a checkpoint created on such a path would prune against arbitrary scalar value. Fixes: 3bda08b63670 ("bpf: Allow NULL buffers in bpf_dynptr_slice(_rw)") Signed-off-by: Eduard Zingerman Link: https://lore.kernel.org/r/20260904-register-is-null-precise-fixes-v1-5-0f5a360ff15d@gmail.com Signed-off-by: Alexei Starovoitov --- arch/arm/mach-imx/hotplug.c | 47 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 47 insertions(+) create mode 100644 arch/arm/mach-imx/hotplug.c (limited to 'arch/arm/mach-imx/hotplug.c') diff --git a/arch/arm/mach-imx/hotplug.c b/arch/arm/mach-imx/hotplug.c new file mode 100644 index 000000000..e24a46dc5 --- /dev/null +++ b/arch/arm/mach-imx/hotplug.c @@ -0,0 +1,47 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright 2011 Freescale Semiconductor, Inc. + * Copyright 2011 Linaro Ltd. + */ + +#include +#include +#include +#include +#include + +#include "common.h" +#include "hardware.h" + +/* + * platform-specific code to shutdown a CPU + * + * Called with IRQs disabled + */ +void imx_cpu_die(unsigned int cpu) +{ + v7_exit_coherency_flush(louis); + /* + * We use the cpu jumping argument register to sync with + * imx_cpu_kill() which is running on cpu0 and waiting for + * the register being cleared to kill the cpu. + */ + imx_set_cpu_arg(cpu, ~0); + + while (1) + cpu_do_idle(); +} + +int imx_cpu_kill(unsigned int cpu) +{ + unsigned long timeout = jiffies + msecs_to_jiffies(50); + + while (imx_get_cpu_arg(cpu) == 0) + if (time_after(jiffies, timeout)) + return 0; + imx_enable_cpu(cpu, false); + imx_set_cpu_arg(cpu, 0); + if (cpu_is_imx7d()) + imx_gpcv2_set_core1_pdn_pup_by_software(true); + return 1; +} -- cgit v1.3.1