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kbuild, x86: Track generated headers with generated-y

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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@intel.com>
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: linux-kbuild@vger.kernel.org
Cc: linux-doc@vger.kernel.org
Cc: Michal Marek <mmarek@suse.com>
Link: http://lkml.kernel.org/r/1466808144-23209-2-git-send-email-james.hogan@imgtec.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
James Hogan 2016-06-24 23:42:23 +01:00 committed by Thomas Gleixner
parent a99cde438d
commit 54b880caf1
2 changed files with 20 additions and 0 deletions
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14
Documentation/kbuild/makefiles.txt
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@ -47,6 +47,7 @@ This document describes the Linux kernel Makefiles.
--- 7.2 genhdr-y --- 7.2 genhdr-y
--- 7.3 destination-y --- 7.3 destination-y
--- 7.4 generic-y --- 7.4 generic-y
--- 7.5 generated-y
=== 8 Kbuild Variables === 8 Kbuild Variables
=== 9 Makefile language === 9 Makefile language
@ -1319,6 +1320,19 @@ See subsequent chapter for the syntax of the Kbuild file.
Example: termios.h Example: termios.h
#include <asm-generic/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 === 8 Kbuild Variables
The top Makefile exports the following variables: The top Makefile exports the following variables:

6
arch/x86/include/asm/Kbuild
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@ -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_32.h
genhdr-y += unistd_64.h genhdr-y += unistd_64.h
genhdr-y += unistd_x32.h genhdr-y += unistd_x32.h