Re: [PATCH v3 1/4] of: remove *phandle properties from expanded device tree
From: Frank Rowand
Date: Sun Apr 30 2017 - 16:50:09 EST
On 04/29/17 17:22, kbuild test robot wrote:
> Hi Frank,
>
> [auto build test ERROR on robh/for-next]
> [also build test ERROR on v4.11-rc8 next-20170428]
> [if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
>
> url: https://github.com/0day-ci/linux/commits/frowand-list-gmail-com/of-remove-phandle-properties-from-expanded-device-tree/20170426-000149
> base: https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git for-next
> config: s390-allmodconfig (attached as .config)
> compiler: s390x-linux-gnu-gcc (Debian 6.1.1-9) 6.1.1 20160705
> reproduce:
> wget https://raw.githubusercontent.com/01org/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
> chmod +x ~/bin/make.cross
> # save the attached .config to linux build tree
> make.cross ARCH=s390
>
> All errors (new ones prefixed by >>):
>
> In file included from include/linux/kobject.h:21:0,
> from include/linux/device.h:17,
> from include/linux/node.h:17,
> from include/linux/cpu.h:16,
> from drivers/of/base.c:25:
> drivers/of/base.c: In function '__of_add_phandle_sysfs':
>>> drivers/of/base.c:198:23: error: 'pp' undeclared (first use in this function)
> sysfs_bin_attr_init(&pp->attr);
> ^
Thanks for the report!
A patch to fix this is now submitted to Rob.
-Frank
> include/linux/sysfs.h:54:3: note: in definition of macro 'sysfs_attr_init'
> (attr)->key = &__key; \
> ^~~~
> drivers/of/base.c:198:2: note: in expansion of macro 'sysfs_bin_attr_init'
> sysfs_bin_attr_init(&pp->attr);
> ^~~~~~~~~~~~~~~~~~~
> drivers/of/base.c:198:23: note: each undeclared identifier is reported only once for each function it appears in
> sysfs_bin_attr_init(&pp->attr);
> ^
> include/linux/sysfs.h:54:3: note: in definition of macro 'sysfs_attr_init'
> (attr)->key = &__key; \
> ^~~~
> drivers/of/base.c:198:2: note: in expansion of macro 'sysfs_bin_attr_init'
> sysfs_bin_attr_init(&pp->attr);
> ^~~~~~~~~~~~~~~~~~~
>
> vim +/pp +198 drivers/of/base.c
>
> 19 */
> 20
> 21 #define pr_fmt(fmt) "OF: " fmt
> 22
> 23 #include <linux/console.h>
> 24 #include <linux/ctype.h>
> > 25 #include <linux/cpu.h>
> 26 #include <linux/module.h>
> 27 #include <linux/of.h>
> 28 #include <linux/of_device.h>
> 29 #include <linux/of_graph.h>
> 30 #include <linux/spinlock.h>
> 31 #include <linux/slab.h>
> 32 #include <linux/string.h>
> 33 #include <linux/proc_fs.h>
> 34
> 35 #include "of_private.h"
> 36
> 37 LIST_HEAD(aliases_lookup);
> 38
> 39 struct device_node *of_root;
> 40 EXPORT_SYMBOL(of_root);
> 41 struct device_node *of_chosen;
> 42 struct device_node *of_aliases;
> 43 struct device_node *of_stdout;
> 44 static const char *of_stdout_options;
> 45
> 46 struct kset *of_kset;
> 47
> 48 /*
> 49 * Used to protect the of_aliases, to hold off addition of nodes to sysfs.
> 50 * This mutex must be held whenever modifications are being made to the
> 51 * device tree. The of_{attach,detach}_node() and
> 52 * of_{add,remove,update}_property() helpers make sure this happens.
> 53 */
> 54 DEFINE_MUTEX(of_mutex);
> 55
> 56 /* use when traversing tree through the child, sibling,
> 57 * or parent members of struct device_node.
> 58 */
> 59 DEFINE_RAW_SPINLOCK(devtree_lock);
> 60
> 61 int of_n_addr_cells(struct device_node *np)
> 62 {
> 63 const __be32 *ip;
> 64
> 65 do {
> 66 if (np->parent)
> 67 np = np->parent;
> 68 ip = of_get_property(np, "#address-cells", NULL);
> 69 if (ip)
> 70 return be32_to_cpup(ip);
> 71 } while (np->parent);
> 72 /* No #address-cells property for the root node */
> 73 return OF_ROOT_NODE_ADDR_CELLS_DEFAULT;
> 74 }
> 75 EXPORT_SYMBOL(of_n_addr_cells);
> 76
> 77 int of_n_size_cells(struct device_node *np)
> 78 {
> 79 const __be32 *ip;
> 80
> 81 do {
> 82 if (np->parent)
> 83 np = np->parent;
> 84 ip = of_get_property(np, "#size-cells", NULL);
> 85 if (ip)
> 86 return be32_to_cpup(ip);
> 87 } while (np->parent);
> 88 /* No #size-cells property for the root node */
> 89 return OF_ROOT_NODE_SIZE_CELLS_DEFAULT;
> 90 }
> 91 EXPORT_SYMBOL(of_n_size_cells);
> 92
> 93 #ifdef CONFIG_NUMA
> 94 int __weak of_node_to_nid(struct device_node *np)
> 95 {
> 96 return NUMA_NO_NODE;
> 97 }
> 98 #endif
> 99
> 100 #ifndef CONFIG_OF_DYNAMIC
> 101 static void of_node_release(struct kobject *kobj)
> 102 {
> 103 /* Without CONFIG_OF_DYNAMIC, no nodes gets freed */
> 104 }
> 105 #endif /* CONFIG_OF_DYNAMIC */
> 106
> 107 struct kobj_type of_node_ktype = {
> 108 .release = of_node_release,
> 109 };
> 110
> 111 static ssize_t of_node_property_read(struct file *filp, struct kobject *kobj,
> 112 struct bin_attribute *bin_attr, char *buf,
> 113 loff_t offset, size_t count)
> 114 {
> 115 struct property *pp = container_of(bin_attr, struct property, attr);
> 116 return memory_read_from_buffer(buf, count, &offset, pp->value, pp->length);
> 117 }
> 118
> 119 static ssize_t of_node_phandle_read(struct file *filp, struct kobject *kobj,
> 120 struct bin_attribute *bin_attr, char *buf,
> 121 loff_t offset, size_t count)
> 122 {
> 123 phandle phandle;
> 124 struct device_node *np;
> 125
> 126 np = container_of(bin_attr, struct device_node, attr_phandle);
> 127 phandle = cpu_to_be32(np->phandle);
> 128 return memory_read_from_buffer(buf, count, &offset, &phandle,
> 129 sizeof(phandle));
> 130 }
> 131
> 132 /* always return newly allocated name, caller must free after use */
> 133 static const char *safe_name(struct kobject *kobj, const char *orig_name)
> 134 {
> 135 const char *name = orig_name;
> 136 struct kernfs_node *kn;
> 137 int i = 0;
> 138
> 139 /* don't be a hero. After 16 tries give up */
> 140 while (i < 16 && (kn = sysfs_get_dirent(kobj->sd, name))) {
> 141 sysfs_put(kn);
> 142 if (name != orig_name)
> 143 kfree(name);
> 144 name = kasprintf(GFP_KERNEL, "%s#%i", orig_name, ++i);
> 145 }
> 146
> 147 if (name == orig_name) {
> 148 name = kstrdup(orig_name, GFP_KERNEL);
> 149 } else {
> 150 pr_warn("Duplicate name in %s, renamed to \"%s\"\n",
> 151 kobject_name(kobj), name);
> 152 }
> 153 return name;
> 154 }
> 155
> 156 int __of_add_property_sysfs(struct device_node *np, struct property *pp)
> 157 {
> 158 int rc;
> 159
> 160 /* Important: Don't leak passwords */
> 161 bool secure = strncmp(pp->name, "security-", 9) == 0;
> 162
> 163 if (!IS_ENABLED(CONFIG_SYSFS))
> 164 return 0;
> 165
> 166 if (!of_kset || !of_node_is_attached(np))
> 167 return 0;
> 168
> 169 sysfs_bin_attr_init(&pp->attr);
> 170 pp->attr.attr.name = safe_name(&np->kobj, pp->name);
> 171 pp->attr.attr.mode = secure ? S_IRUSR : S_IRUGO;
> 172 pp->attr.size = secure ? 0 : pp->length;
> 173 pp->attr.read = of_node_property_read;
> 174
> 175 rc = sysfs_create_bin_file(&np->kobj, &pp->attr);
> 176 WARN(rc, "error adding attribute %s to node %s\n", pp->name, np->full_name);
> 177 return rc;
> 178 }
> 179
> 180 /*
> 181 * In the imported device tree (fdt), phandle is a property. In the
> 182 * internal data structure it is instead stored in the struct device_node.
> 183 * Make phandle visible in sysfs as if it was a property.
> 184 */
> 185 int __of_add_phandle_sysfs(struct device_node *np)
> 186 {
> 187 int rc;
> 188
> 189 if (!IS_ENABLED(CONFIG_SYSFS))
> 190 return 0;
> 191
> 192 if (!of_kset || !of_node_is_attached(np))
> 193 return 0;
> 194
> 195 if (!np->phandle || np->phandle == 0xffffffff)
> 196 return 0;
> 197
> > 198 sysfs_bin_attr_init(&pp->attr);
> 199 np->attr_phandle.attr.name = "phandle";
> 200 np->attr_phandle.attr.mode = 0444;
> 201 np->attr_phandle.size = sizeof(np->phandle);
>
> ---
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>