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01ebb77b31
The values in init_tss.ist[] can change when an IST event occurs. Save the original IST values for checking stack addresses when debugging or doing stack traces. Signed-off-by: Keith Owens <kaos@ocs.com.au> Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
55 lines
1.7 KiB
C
55 lines
1.7 KiB
C
#include <linux/mm.h>
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#include <linux/module.h>
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#include <linux/sched.h>
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#include <linux/init.h>
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#include <linux/init_task.h>
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#include <linux/fs.h>
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#include <linux/mqueue.h>
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#include <asm/uaccess.h>
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#include <asm/pgtable.h>
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#include <asm/desc.h>
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static struct fs_struct init_fs = INIT_FS;
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static struct files_struct init_files = INIT_FILES;
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static struct signal_struct init_signals = INIT_SIGNALS(init_signals);
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static struct sighand_struct init_sighand = INIT_SIGHAND(init_sighand);
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struct mm_struct init_mm = INIT_MM(init_mm);
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EXPORT_SYMBOL(init_mm);
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/*
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* Initial task structure.
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*
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* We need to make sure that this is 8192-byte aligned due to the
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* way process stacks are handled. This is done by having a special
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* "init_task" linker map entry..
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*/
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union thread_union init_thread_union
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__attribute__((__section__(".data.init_task"))) =
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{ INIT_THREAD_INFO(init_task) };
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/*
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* Initial task structure.
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*
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* All other task structs will be allocated on slabs in fork.c
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*/
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struct task_struct init_task = INIT_TASK(init_task);
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EXPORT_SYMBOL(init_task);
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/*
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* per-CPU TSS segments. Threads are completely 'soft' on Linux,
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* no more per-task TSS's. The TSS size is kept cacheline-aligned
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* so they are allowed to end up in the .data.cacheline_aligned
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* section. Since TSS's are completely CPU-local, we want them
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* on exact cacheline boundaries, to eliminate cacheline ping-pong.
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*/
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DEFINE_PER_CPU(struct tss_struct, init_tss) ____cacheline_internodealigned_in_smp = INIT_TSS;
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/* Copies of the original ist values from the tss are only accessed during
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* debugging, no special alignment required.
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*/
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DEFINE_PER_CPU(struct orig_ist, orig_ist);
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#define ALIGN_TO_4K __attribute__((section(".data.init_task")))
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