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| author | David Howells <dhowells@redhat.com> | 2018-01-02 15:12:01 +0000 |
|---|---|---|
| committer | David Howells <dhowells@redhat.com> | 2018-01-09 23:21:02 +0000 |
| commit | 0500871f21b237b2bea2d9db405eadf78e5aab05 (patch) | |
| tree | 6004424368ea44f74d9d9d66fb565a59d3dba970 /arch/ia64/kernel | |
| parent | 138101932054268a235c6ac7cf474f6a88fcd885 (diff) | |
| download | linux-0500871f21b237b2bea2d9db405eadf78e5aab05.tar.bz2 | |
Construct init thread stack in the linker script rather than by union
Construct the init thread stack in the linker script rather than doing it
by means of a union so that ia64's init_task.c can be got rid of.
The following symbols are then made available from INIT_TASK_DATA() linker
script macro:
init_thread_union
init_stack
INIT_TASK_DATA() also expands the region to THREAD_SIZE to accommodate the
size of the init stack. init_thread_union is given its own section so that
it can be placed into the stack space in the right order. I'm assuming
that the ia64 ordering is correct and that the task_struct is first and the
thread_info second.
Signed-off-by: David Howells <dhowells@redhat.com>
Tested-by: Tony Luck <tony.luck@intel.com>
Tested-by: Will Deacon <will.deacon@arm.com> (arm64)
Tested-by: Palmer Dabbelt <palmer@sifive.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/ia64/kernel')
| -rw-r--r-- | arch/ia64/kernel/Makefile | 2 | ||||
| -rw-r--r-- | arch/ia64/kernel/init_task.c | 44 | ||||
| -rw-r--r-- | arch/ia64/kernel/vmlinux.lds.S | 1 |
3 files changed, 2 insertions, 45 deletions
diff --git a/arch/ia64/kernel/Makefile b/arch/ia64/kernel/Makefile index 14ad79f394e5..0b4c65a1af25 100644 --- a/arch/ia64/kernel/Makefile +++ b/arch/ia64/kernel/Makefile @@ -7,7 +7,7 @@ ifdef CONFIG_DYNAMIC_FTRACE CFLAGS_REMOVE_ftrace.o = -pg endif -extra-y := head.o init_task.o vmlinux.lds +extra-y := head.o vmlinux.lds obj-y := entry.o efi.o efi_stub.o gate-data.o fsys.o ia64_ksyms.o irq.o irq_ia64.o \ irq_lsapic.o ivt.o machvec.o pal.o patch.o process.o perfmon.o ptrace.o sal.o \ diff --git a/arch/ia64/kernel/init_task.c b/arch/ia64/kernel/init_task.c deleted file mode 100644 index 8df9245e29d9..000000000000 --- a/arch/ia64/kernel/init_task.c +++ /dev/null @@ -1,44 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * This is where we statically allocate and initialize the initial - * task. - * - * Copyright (C) 1999, 2002-2003 Hewlett-Packard Co - * David Mosberger-Tang <davidm@hpl.hp.com> - */ - -#include <linux/init.h> -#include <linux/mm.h> -#include <linux/fs.h> -#include <linux/module.h> -#include <linux/sched.h> -#include <linux/init_task.h> -#include <linux/mqueue.h> - -#include <linux/uaccess.h> -#include <asm/pgtable.h> - -static struct signal_struct init_signals = INIT_SIGNALS(init_signals); -static struct sighand_struct init_sighand = INIT_SIGHAND(init_sighand); -/* - * Initial task structure. - * - * We need to make sure that this is properly aligned due to the way process stacks are - * handled. This is done by having a special ".data..init_task" section... - */ -#define init_thread_info init_task_mem.s.thread_info -#define init_stack init_task_mem.stack - -union { - struct { - struct task_struct task; - struct thread_info thread_info; - } s; - unsigned long stack[KERNEL_STACK_SIZE/sizeof (unsigned long)]; -} init_task_mem asm ("init_task") __init_task_data = - {{ - .task = INIT_TASK(init_task_mem.s.task), - .thread_info = INIT_THREAD_INFO(init_task_mem.s.task) -}}; - -EXPORT_SYMBOL(init_task); diff --git a/arch/ia64/kernel/vmlinux.lds.S b/arch/ia64/kernel/vmlinux.lds.S index 58db59da0bd8..b0b2070e0591 100644 --- a/arch/ia64/kernel/vmlinux.lds.S +++ b/arch/ia64/kernel/vmlinux.lds.S @@ -3,6 +3,7 @@ #include <asm/cache.h> #include <asm/ptrace.h> #include <asm/pgtable.h> +#include <asm/thread_info.h> #include <asm-generic/vmlinux.lds.h> |