Hi Linus,
I'm sending you this now for the next merge window as I'm soon going to get
on a plane to go down under for a couple of weeks. I think this is
something that should be done at the end of the merge window, however.
---
It doesn't seem useful to have the init_task in a header file rather than
in a normal source file. We could consolidate init_task handling instead and
expand out various macros.
Here's a series of patches that consolidate init_task handling:
(1) Make THREAD_SIZE available to vmlinux.lds for cris, hexagon and
openrisc.
(2) Alter the INIT_TASK_DATA linker script macro to set init_thread_union
and init_stack rather than defining these in C.
Insert init_task and init_thread_into into the init_stack area in the
linker script as appropriate to the configuration, with different
section markers so that they end up correctly ordered.
We can then get merge ia64's init_task.c into the main one.
We then have a bunch of single-use INIT_*() macros that seem only to be
macros because they used to be used per-arch. We can then expand these in
place of the user and get rid of a few lines and a lot of backslashes.
(3) Expand INIT_TASK() in place.
(4) Expand in place various small INIT_*() macros that are defined
conditionally. Expand them and surround them by #if[n]def/#endif in
the .c file as it takes fewer lines.
(5) Expand INIT_SIGNALS() and INIT_SIGHAND() in place.
(6) Expand INIT_STRUCT_PID in place.
These macros can then be discarded.
The patches can be found here also:
http://git.kernel.org/cgit/linux/kernel/git/dhowells/linux-fs.git/log/?h=init_task
tagged as:
init_task-20180117
David
---
David Howells (8):
cris: Make THREAD_SIZE available to vmlinux.lds
hexagon: Make THREAD_SIZE available to vmlinux.lds
openrisc: Make THREAD_SIZE available to vmlinux.lds
Construct init thread stack in the linker script rather than by union
Expand INIT_TASK() in init/init_task.c and remove
Expand various INIT_* macros and remove
Expand the INIT_SIGNALS and INIT_SIGHAND macros and remove
Expand INIT_STRUCT_PID and remove
arch/Kconfig | 4
arch/alpha/include/asm/thread_info.h | 3
arch/arc/include/asm/thread_info.h | 3
arch/arm/include/asm/thread_info.h | 3
arch/arm64/include/asm/thread_info.h | 2
arch/blackfin/include/asm/thread_info.h | 2
arch/c6x/include/asm/thread_info.h | 3
arch/cris/include/asm/processor.h | 9 -
arch/cris/include/asm/thread_info.h | 9 +
arch/cris/kernel/vmlinux.lds.S | 1
arch/frv/include/asm/thread_info.h | 3
arch/h8300/include/asm/thread_info.h | 3
arch/hexagon/include/asm/thread_info.h | 3
arch/hexagon/kernel/vmlinux.lds.S | 2
arch/ia64/Kconfig | 2
arch/ia64/Makefile | 2
arch/ia64/include/asm/thread_info.h | 4
arch/ia64/kernel/Makefile | 2
arch/ia64/kernel/init_task.c | 44 -----
arch/ia64/kernel/vmlinux.lds.S | 1
arch/m32r/include/asm/thread_info.h | 3
arch/m68k/include/asm/thread_info.h | 4
arch/metag/include/asm/thread_info.h | 3
arch/microblaze/include/asm/thread_info.h | 3
arch/mips/include/asm/thread_info.h | 3
arch/mn10300/include/asm/thread_info.h | 2
arch/nios2/include/asm/thread_info.h | 3
arch/openrisc/include/asm/processor.h | 2
arch/openrisc/include/asm/thread_info.h | 2
arch/openrisc/kernel/vmlinux.lds.S | 1
arch/parisc/include/asm/thread_info.h | 3
arch/powerpc/include/asm/thread_info.h | 3
arch/riscv/include/asm/thread_info.h | 2
arch/s390/include/asm/thread_info.h | 2
arch/score/include/asm/thread_info.h | 3
arch/sh/include/asm/thread_info.h | 3
arch/sparc/include/asm/thread_info_32.h | 3
arch/sparc/include/asm/thread_info_64.h | 3
arch/tile/include/asm/thread_info.h | 3
arch/um/include/asm/processor-generic.h | 5 -
arch/um/include/asm/thread_info.h | 9 -
arch/um/include/asm/vmlinux.lds.h | 2
arch/um/kernel/dyn.lds.S | 3
arch/um/kernel/um_arch.c | 2
arch/um/kernel/uml.lds.S | 2
arch/unicore32/include/asm/thread_info.h | 3
arch/x86/include/asm/thread_info.h | 2
arch/xtensa/include/asm/thread_info.h | 3
include/asm-generic/vmlinux.lds.h | 4
include/linux/ftrace.h | 12 -
include/linux/init_task.h | 258 +----------------------------
include/linux/irqflags.h | 2
include/linux/lockdep.h | 3
include/linux/sched.h | 9 +
init/Makefile | 2
init/init_task.c | 170 ++++++++++++++++++-
kernel/pid.c | 14 +-
57 files changed, 230 insertions(+), 431 deletions(-)
delete mode 100644 arch/ia64/kernel/init_task.c
create mode 100644 arch/um/include/asm/vmlinux.lds.h
