kbuild: doc: clarify the difference between extra-y and always-y

The difference between extra-y and always-y is obscure.

Basically, Kbuild builds targets listed in extra-y and always-y in
visited Makefiles without relying on any dependency.

The difference is that extra-y is used to list the targets needed for
vmlinux whereas always-y is used to list the targets that must be always
built irrespective of final targets.

Kbuild skips extra-y when it is building only modules (i.e.
'make modules'). This is the long-standing behavior since extra-y was
introduced in 2003, and it is explained in that commit log [1].

For clarification, this is the extra-y vs always-y table:

                  extra-y    always-y
  'make'             y          y
  'make vmlinux'     y          y
  'make modules'     n          y

Kbuild skips extra-y also when building external modules since obviously
it never builds vmlinux.

Unfortunately, extra-y is wrongly used in many places of upstream code,
and even in external modules.

Using extra-y in external module Makefiles is wrong. What you should
use is probably always-y or 'targets'.

The current documentation for extra-y is misleading. I rewrote it, and
moved it to the section 3.7.

always-y is not documented anywhere. I added.

[1]: https://git.kernel.org/pub/scm/linux/kernel/git/history/history.git/commit/?id=f94e5fd7e5d09a56a60670a9bb211a791654bba8

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Randy Dunlap <rdunlap@infradead.org>

diff --git a/Documentation/kbuild/makefiles.rst b/Documentation/kbuild/makefiles.rst
index a573ee9..3f1697c 100644 (file)
--- a/Documentation/kbuild/makefiles.rst
+++ b/Documentation/kbuild/makefiles.rst
@@ -15,13 +15,15 @@ This document describes the Linux kernel Makefiles.
           --- 3.4 Objects which export symbols
           --- 3.5 Library file goals - lib-y
           --- 3.6 Descending down in directories
-          --- 3.7 Compilation flags
-          --- 3.8 Dependency tracking
-          --- 3.9 Custom Rules
-          --- 3.10 Command change detection
-          --- 3.11 $(CC) support functions
-          --- 3.12 $(LD) support functions
-          --- 3.13 Script Invocation
+          --- 3.7 Non-builtin vmlinux targets - extra-y
+          --- 3.8 Always built goals - always-y
+          --- 3.9 Compilation flags
+          --- 3.10 Dependency tracking
+          --- 3.11 Custom Rules
+          --- 3.12 Command change detection
+          --- 3.13 $(CC) support functions
+          --- 3.14 $(LD) support functions
+          --- 3.15 Script Invocation
 
        === 4 Host Program support
           --- 4.1 Simple Host Program
@@ -321,7 +323,60 @@ more details, with real examples.
        names. This allows kbuild to totally skip the directory if the
        corresponding `CONFIG_` option is neither 'y' nor 'm'.
 
-3.7 Compilation flags
+3.7 Non-builtin vmlinux targets - extra-y
+-----------------------------------------
+
+       extra-y specifies targets which are needed for building vmlinux,
+       but not combined into built-in.a.
+
+       Examples are:
+
+       1) head objects
+
+           Some objects must be placed at the head of vmlinux. They are
+           directly linked to vmlinux without going through built-in.a
+           A typical use-case is an object that contains the entry point.
+
+           arch/$(SRCARCH)/Makefile should specify such objects as head-y.
+
+           Discussion:
+             Given that we can control the section order in the linker script,
+             why do we need head-y?
+
+       2) vmlinux linker script
+
+           The linker script for vmlinux is located at
+           arch/$(SRCARCH)/kernel/vmlinux.lds
+
+       Example::
+
+               # arch/x86/kernel/Makefile
+               extra-y := head_$(BITS).o
+               extra-y += head$(BITS).o
+               extra-y += ebda.o
+               extra-y += platform-quirks.o
+               extra-y += vmlinux.lds
+
+       $(extra-y) should only contain targets needed for vmlinux.
+
+       Kbuild skips extra-y when vmlinux is apparently not a final goal.
+       (e.g. 'make modules', or building external modules)
+
+       If you intend to build targets unconditionally, always-y (explained
+       in the next section) is the correct syntax to use.
+
+3.8 Always built goals - always-y
+---------------------------------
+
+       always-y specifies targets which are literally always built when
+       Kbuild visits the Makefile.
+
+       Example::
+         # ./Kbuild
+         offsets-file := include/generated/asm-offsets.h
+         always-y += $(offsets-file)
+
+3.9 Compilation flags
 ---------------------
 
     ccflags-y, asflags-y and ldflags-y
@@ -410,8 +465,8 @@ more details, with real examples.
                AFLAGS_iwmmxt.o      := -Wa,-mcpu=iwmmxt
 
 
-3.8 Dependency tracking
------------------------
+3.10 Dependency tracking
+------------------------
 
        Kbuild tracks dependencies on the following:
 
@@ -422,8 +477,8 @@ more details, with real examples.
        Thus, if you change an option to $(CC) all affected files will
        be re-compiled.
 
-3.9 Custom Rules
-----------------
+3.11 Custom Rules
+-----------------
 
        Custom rules are used when the kbuild infrastructure does
        not provide the required support. A typical example is
@@ -499,7 +554,7 @@ more details, with real examples.
 
        will be displayed with "make KBUILD_VERBOSE=0".
 
-3.10 Command change detection
+3.12 Command change detection
 -----------------------------
 
        When the rule is evaluated, timestamps are compared between the target
@@ -545,7 +600,7 @@ more details, with real examples.
                unwanted results when the target is up to date and only the
                tests on changed commands trigger execution of commands.
 
-3.11 $(CC) support functions
+3.13 $(CC) support functions
 ----------------------------
 
        The kernel may be built with several different versions of
@@ -660,7 +715,7 @@ more details, with real examples.
                        endif
                endif
 
-3.12 $(LD) support functions
+3.14 $(LD) support functions
 ----------------------------
 
     ld-option
@@ -674,7 +729,7 @@ more details, with real examples.
                #Makefile
                LDFLAGS_vmlinux += $(call ld-option, -X)
 
-3.13 Script invocation
+3.15 Script invocation
 ----------------------
 
        Make rules may invoke scripts to build the kernel. The rules shall
@@ -1304,29 +1359,6 @@ When kbuild executes, the following steps are followed (roughly):
 
        When "make" is executed without arguments, bzImage will be built.
 
-7.6 Building non-kbuild targets
--------------------------------
-
-    extra-y
-       extra-y specifies additional targets created in the current
-       directory, in addition to any targets specified by `obj-*`.
-
-       Listing all targets in extra-y is required for two purposes:
-
-       1) Enable kbuild to check changes in command lines
-
-          - When $(call if_changed,xxx) is used
-
-       2) kbuild knows what files to delete during "make clean"
-
-       Example::
-
-               #arch/x86/kernel/Makefile
-               extra-y := head.o init_task.o
-
-       In this example, extra-y is used to list object files that
-       shall be built, but shall not be linked as part of built-in.a.
-
 7.7 Commands useful for building a boot image
 ---------------------------------------------