aboutsummaryrefslogtreecommitdiff
path: root/kernel/ksysfs.c
diff options
context:
space:
mode:
authorRoland McGrath <roland@redhat.com>2007-07-19 01:48:39 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-19 10:04:47 -0700
commitda1a679cde9b12d6e331f43d2d92a234f2d1f9b0 (patch)
treed8cf046a064a1f00443627a6d68b631789882f29 /kernel/ksysfs.c
parent86ead9caf9a9f265f6065c46080d046230e25d78 (diff)
downloadlinux-2.6.34-ux500-da1a679cde9b12d6e331f43d2d92a234f2d1f9b0.tar.gz
Add /sys/kernel/notes
This patch adds the /sys/kernel/notes magic file. Reading this delivers the contents of the kernel's .notes section. This lets userland easily glean any detailed information about the running kernel's build that was stored there at compile time. Signed-off-by: Roland McGrath <roland@redhat.com> Cc: Andi Kleen <ak@suse.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Richard Henderson <rth@twiddle.net> Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/ksysfs.c')
-rw-r--r--kernel/ksysfs.c28
1 files changed, 28 insertions, 0 deletions
diff --git a/kernel/ksysfs.c b/kernel/ksysfs.c
index 559deca5ed1..2565e1b6dd7 100644
--- a/kernel/ksysfs.c
+++ b/kernel/ksysfs.c
@@ -62,6 +62,28 @@ static ssize_t kexec_crash_loaded_show(struct kset *kset, char *page)
KERNEL_ATTR_RO(kexec_crash_loaded);
#endif /* CONFIG_KEXEC */
+/*
+ * Make /sys/kernel/notes give the raw contents of our kernel .notes section.
+ */
+extern const char __start_notes __attribute__((weak));
+extern const char __stop_notes __attribute__((weak));
+#define notes_size (&__stop_notes - &__start_notes)
+
+static ssize_t notes_read(struct kobject *kobj, struct bin_attribute *bin_attr,
+ char *buf, loff_t off, size_t count)
+{
+ memcpy(buf, &__start_notes + off, count);
+ return count;
+}
+
+static struct bin_attribute notes_attr = {
+ .attr = {
+ .name = "notes",
+ .mode = S_IRUGO,
+ },
+ .read = &notes_read,
+};
+
decl_subsys(kernel, NULL, NULL);
EXPORT_SYMBOL_GPL(kernel_subsys);
@@ -88,6 +110,12 @@ static int __init ksysfs_init(void)
error = sysfs_create_group(&kernel_subsys.kobj,
&kernel_attr_group);
+ if (!error && notes_size > 0) {
+ notes_attr.size = notes_size;
+ error = sysfs_create_bin_file(&kernel_subsys.kobj,
+ &notes_attr);
+ }
+
return error;
}