bpf: mark a NULL kfunc argument precisegrafted

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 <eddyz87@gmail.com>
Link: https://lore.kernel.org/r/20260904-register-is-null-precise-fixes-v1-5-0f5a360ff15d@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

1 files changed, 71 insertions, 0 deletions

diff --git a/drivers/pci/controller/pci-host-common.h b/drivers/pci/controller/pci-host-common.h
new file mode 100644
index 000000000..9f0f36a32
--- /dev/null
+++ b/drivers/pci/controller/pci-host-common.h
@@ -0,0 +1,71 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Common library for PCI host controller drivers
+ *
+ * Copyright (C) 2014 ARM Limited
+ *
+ * Author: Will Deacon <will.deacon@arm.com>
+ */
+
+#ifndef _PCI_HOST_COMMON_H
+#define _PCI_HOST_COMMON_H
+
+#include <linux/delay.h>
+#include "../pci.h"
+
+struct pci_ecam_ops;
+
+/**
+ * struct pci_host_perst - PERST# GPIO descriptor
+ * @list: List node for linking multiple PERST# GPIOs
+ * @desc: GPIO descriptor for PERST# signal
+ *
+ * This structure holds a single PERST# GPIO descriptor.
+ */
+struct pci_host_perst {
+	struct list_head	list;
+	struct gpio_desc	*desc;
+};
+
+/**
+ * struct pci_host_port - Generic Root Port properties
+ * @list: List node for linking multiple ports
+ * @perst: List of PERST# GPIO descriptors for this port and its children
+ *
+ * This structure contains common properties that can be parsed from
+ * Root Port device tree nodes.
+ */
+struct pci_host_port {
+	struct list_head	list;
+	struct list_head	perst;
+};
+
+void pci_host_common_delete_ports(void *data);
+int pci_host_common_parse_ports(struct device *dev,
+				struct pci_host_bridge *bridge);
+int pci_host_common_probe(struct platform_device *pdev);
+int pci_host_common_init(struct platform_device *pdev,
+			 struct pci_host_bridge *bridge,
+			 const struct pci_ecam_ops *ops);
+void pci_host_common_remove(struct platform_device *pdev);
+
+struct pci_config_window *pci_host_common_ecam_create(struct device *dev,
+	struct pci_host_bridge *bridge, const struct pci_ecam_ops *ops);
+
+bool pci_host_common_d3cold_possible(struct pci_host_bridge *bridge,
+				     bool *pme_capable);
+
+/**
+ * pci_host_common_link_train_delay - Wait 100 ms if link speed > 5 GT/s
+ * @max_link_speed: the maximum link speed (2 = 5.0 GT/s, 3 = 8.0 GT/s, ...)
+ *
+ * Must be called after Link training completes and before the first
+ * Configuration Request is sent.
+ */
+static inline void pci_host_common_link_train_delay(int max_link_speed)
+{
+	if (max_link_speed > 2)
+		msleep(PCIE_RESET_CONFIG_WAIT_MS);
+}
+
+#endif