UBUNTU: SAUCE: (no-up) version: Implement version_signature proc file.

Signed-off-by: Andy Whitcroft <apw@canonical.com>
Acked-by: Tim Gardener <tim.gardner@canonical.com>

diff --git a/fs/proc/Makefile b/fs/proc/Makefile
index df434c5..209b706 100644 (file)
--- a/fs/proc/Makefile
+++ b/fs/proc/Makefile
@@ -27,3 +27,4 @@ proc-$(CONFIG_PROC_VMCORE)    += vmcore.o
 proc-$(CONFIG_PROC_DEVICETREE) += proc_devtree.o
 proc-$(CONFIG_PRINTK)  += kmsg.o
 proc-$(CONFIG_PROC_PAGE_MONITOR)       += page.o
+proc-y += version_signature.o

diff --git a/fs/proc/version_signature.c b/fs/proc/version_signature.c
new file mode 100644 (file)
index 0000000..859fb60
--- /dev/null
+++ b/fs/proc/version_signature.c
@@ -0,0 +1,31 @@
+#include <linux/fs.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/utsname.h>
+
+static int version_signature_proc_show(struct seq_file *m, void *v)
+{
+       seq_printf(m, "%s\n", CONFIG_VERSION_SIGNATURE);
+       return 0;
+}
+
+static int version_signature_proc_open(struct inode *inode, struct file *file)
+{
+       return single_open(file, version_signature_proc_show, NULL);
+}
+
+static const struct file_operations version_signature_proc_fops = {
+       .open           = version_signature_proc_open,
+       .read           = seq_read,
+       .llseek         = seq_lseek,
+       .release        = single_release,
+};
+
+static int __init proc_version_signature_init(void)
+{
+       proc_create("version_signature", 0, NULL, &version_signature_proc_fops);
+       return 0;
+}
+module_init(proc_version_signature_init);

diff --git a/init/Kconfig b/init/Kconfig
index be788c0..464c84a 100644 (file)
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -209,6 +209,15 @@ config KERNEL_LZO
 
 endchoice
 
+config VERSION_SIGNATURE
+       string "Arbitrary version signature"
+       help
+         This string will be created in a file, /proc/version_signature. It
+         is useful in determining arbitrary data about your kernel. For instance,
+         if you have several kernels of the same version, but need to keep track
+         of a revision of the same kernel, but not affect it's ability to load
+         compatible modules, this is the easiest way to do that.
+
 config SWAP
        bool "Support for paging of anonymous memory (swap)"
        depends on MMU && BLOCK

diff --git a/init/version.c b/init/version.c
index adff586..79fb8c2 100644 (file)
--- a/init/version.c
+++ b/init/version.c
@@ -39,7 +39,11 @@ EXPORT_SYMBOL_GPL(init_uts_ns);
 /* FIXED STRINGS! Don't touch! */
 const char linux_banner[] =
        "Linux version " UTS_RELEASE " (" LINUX_COMPILE_BY "@"
-       LINUX_COMPILE_HOST ") (" LINUX_COMPILER ") " UTS_VERSION "\n";
+       LINUX_COMPILE_HOST ") (" LINUX_COMPILER ") " UTS_VERSION
+#ifdef CONFIG_VERSION_SIGNATURE
+        " (" CONFIG_VERSION_SIGNATURE ")"
+#endif
+       "\n";
 
 const char linux_proc_banner[] =
        "%s version %s"