[PATCH v4 1/2] kbuild, x86: Track generated headers with generated-y

From: James Hogan
Date: Fri Jun 24 2016 - 18:42:55 EST


Track generated header files which aren't already in genhdr-y, alongside
generic-y wrappers in the */include/generated/[uapi/]asm/ directories.
Currently only x86 generates extra headers in these directories, for the
purposes of enumerating system calls for different ABIs, and xen
hypercalls.

This will allow the asm-generic wrapper handling code to remove stale
wrappers when files are removed from generic-y, without also removing
these headers which are generated separately.

Reported-by: kbuild test robot <fengguang.wu@xxxxxxxxx>
Signed-off-by: James Hogan <james.hogan@xxxxxxxxxx>
Acked-by: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Michal Marek <mmarek@xxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: Jonathan Corbet <corbet@xxxxxxx>
Cc: linux-kbuild@xxxxxxxxxxxxxxx
Cc: x86@xxxxxxxxxx
Cc: linux-doc@xxxxxxxxxxxxxxx
---
Changes in v4:
- None (resend).

Changes in v2:
- New patch (thanks to kbuild test robot).
---
Documentation/kbuild/makefiles.txt | 14 ++++++++++++++
arch/x86/include/asm/Kbuild | 6 ++++++
2 files changed, 20 insertions(+)

diff --git a/Documentation/kbuild/makefiles.txt b/Documentation/kbuild/makefiles.txt
index 13f888a02a3d..385a5ef41c17 100644
--- a/Documentation/kbuild/makefiles.txt
+++ b/Documentation/kbuild/makefiles.txt
@@ -47,6 +47,7 @@ This document describes the Linux kernel Makefiles.
--- 7.2 genhdr-y
--- 7.3 destination-y
--- 7.4 generic-y
+ --- 7.5 generated-y

=== 8 Kbuild Variables
=== 9 Makefile language
@@ -1319,6 +1320,19 @@ See subsequent chapter for the syntax of the Kbuild file.
Example: termios.h
#include <asm-generic/termios.h>

+ --- 7.5 generated-y
+
+ If an architecture generates other header files alongside generic-y
+ wrappers, and not included in genhdr-y, then generated-y specifies
+ them.
+
+ This prevents them being treated as stale asm-generic wrappers and
+ removed.
+
+ Example:
+ #arch/x86/include/asm/Kbuild
+ generated-y += syscalls_32.h
+
=== 8 Kbuild Variables

The top Makefile exports the following variables:
diff --git a/arch/x86/include/asm/Kbuild b/arch/x86/include/asm/Kbuild
index aeac434c9feb..2cfed174e3c9 100644
--- a/arch/x86/include/asm/Kbuild
+++ b/arch/x86/include/asm/Kbuild
@@ -1,5 +1,11 @@


+generated-y += syscalls_32.h
+generated-y += syscalls_64.h
+generated-y += unistd_32_ia32.h
+generated-y += unistd_64_x32.h
+generated-y += xen-hypercalls.h
+
genhdr-y += unistd_32.h
genhdr-y += unistd_64.h
genhdr-y += unistd_x32.h
--
2.4.10