Introduce new section reference annotations tags: __ref, __refdata, __refconst

Today we have the following annotations for functions/data
referencing __init/__exit functions / data:

__init_refok     => for init functions
__initdata_refok => for init data
__exit_refok     => for exit functions

There is really no difference between the __init and __exit
versions and simplify it and to introduce a shorter annotation
the following new annotations are introduced:

__ref      => for functions (code) that
              references __*init / __*exit
__refdata  => for variables
__refconst => for const variables

Whit this annotation is it more obvious what the annotation
is for and there is no longer the arbitary division
between __init and __exit code.

The mechanishm is the same as before - a special section
is created which is made part of the usual sections
in the linker script.

We will start to see annotations like this:

-static struct pci_serial_quirk pci_serial_quirks[] = {
+static const struct pci_serial_quirk pci_serial_quirks[] __refconst = {
-----------------
-static struct notifier_block __cpuinitdata cpuid_class_cpu_notifier =
+static struct notifier_block cpuid_class_cpu_notifier __refdata =
----------------
-static int threshold_cpu_callback(struct notifier_block *nfb,
+static int __ref threshold_cpu_callback(struct notifier_block *nfb,

[The above is just random samples].

Note: No modifications were needed in modpost
to support the new sections due to the newly introduced
blacklisting.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
index 294853053707..76df771be585 100644
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -42,6 +42,7 @@
 #define DATA_DATA                                                       \
         *(.data)                                                        \
         *(.data.init.refok)                                             \
+        *(.ref.data)                                                    \
         DEV_KEEP(init.data)                                             \
         DEV_KEEP(exit.data)                                             \
         CPU_KEEP(init.data)                                             \
@@ -169,6 +170,7 @@
                                                                         \
         /* __*init sections */                                          \
         __init_rodata : AT(ADDR(__init_rodata) - LOAD_OFFSET) {         \
+                *(.ref.rodata)                                          \
                 DEV_KEEP(init.rodata)                                   \
                 DEV_KEEP(exit.rodata)                                   \
                 CPU_KEEP(init.rodata)                                   \
@@ -202,6 +204,7 @@
 #define TEXT_TEXT                                                       \
                 ALIGN_FUNCTION();                                       \
                 *(.text)                                                \
+                *(.ref.text)                                            \
                 *(.text.init.refok)                                     \
                 *(.exit.text.refok)                                     \
         DEV_KEEP(init.text)                                             \