Messages in this thread Patch in this message | | | From | Keith Owens <> | Subject | [patch 2/3] kallsyms: Add in_gate_area_no_task() | Date | Sun, 28 Nov 2004 14:55:15 +1100 |
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Add in_gate_area_no_task() for use in places where no task is valid (e.g. kallsyms). If you have a valid task, use in_gate_area() as before.
Signed-off-by: Keith Owens <kaos@ocs.com.au>
Index: 2.6.10-rc2-bk11/arch/x86_64/mm/init.c =================================================================== --- 2.6.10-rc2-bk11.orig/arch/x86_64/mm/init.c 2004-11-15 14:25:52.154487837 +1100 +++ 2.6.10-rc2-bk11/arch/x86_64/mm/init.c 2004-11-28 14:42:19.525997420 +1100 @@ -623,3 +623,13 @@ int in_gate_area(struct task_struct *tas struct vm_area_struct *vma = get_gate_vma(task); return (addr >= vma->vm_start) && (addr < vma->vm_end); } + +/* Use this when you have no reliable task/vma, typically from interrupt + * context. It is less reliable than using the task's vma and may give + * false positives. + */ +int in_gate_area_no_task(unsigned long addr) +{ + return ((addr >= VSYSCALL_START) && (addr < VSYSCALL_END) || + (addr >= VSYSCALL32_BASE) && (addr < VSYSCALL32_END)); +} Index: 2.6.10-rc2-bk11/include/linux/mm.h =================================================================== --- 2.6.10-rc2-bk11.orig/include/linux/mm.h 2004-11-28 14:42:13.868860636 +1100 +++ 2.6.10-rc2-bk11/include/linux/mm.h 2004-11-28 14:42:19.526997267 +1100 @@ -800,7 +800,13 @@ kernel_map_pages(struct page *page, int #endif extern struct vm_area_struct *get_gate_vma(struct task_struct *tsk); +#ifdef __HAVE_ARCH_GATE_AREA +int in_gate_area_no_task(unsigned long addr); int in_gate_area(struct task_struct *task, unsigned long addr); +#else +int in_gate_area_no_task(unsigned long addr); +#define in_gate_area(task, addr) ({(void)task; in_gate_area_no_task(addr);}) +#endif /* __HAVE_ARCH_GATE_AREA */ #endif /* __KERNEL__ */ #endif /* _LINUX_MM_H */ Index: 2.6.10-rc2-bk11/mm/memory.c =================================================================== --- 2.6.10-rc2-bk11.orig/mm/memory.c 2004-11-28 14:42:13.870860331 +1100 +++ 2.6.10-rc2-bk11/mm/memory.c 2004-11-28 14:42:19.527997114 +1100 @@ -1837,7 +1837,7 @@ struct vm_area_struct *get_gate_vma(stru #endif } -int in_gate_area(struct task_struct *task, unsigned long addr) +int in_gate_area_no_task(unsigned long addr) { #ifdef AT_SYSINFO_EHDR if ((addr >= FIXADDR_USER_START) && (addr < FIXADDR_USER_END)) - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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