aboutsummaryrefslogtreecommitdiffstats
path: root/arch/ia64/kernel/ptrace.c
diff options
context:
space:
mode:
authorPetr Tesarik <ptesarik@suse.cz>2008-02-11 22:42:34 +0100
committerTony Luck <tony.luck@intel.com>2008-03-05 15:48:16 -0800
commite868a55c2a8cb72b66d7137fbcc54b82016e98eb (patch)
tree05c1fc4e3d84537aa80709a1091c0ce2978f025d /arch/ia64/kernel/ptrace.c
parent[IA64] do not sync RBS when changing PT_AR_BSP or PT_CFM (diff)
downloadlinux-dev-e868a55c2a8cb72b66d7137fbcc54b82016e98eb.tar.xz
linux-dev-e868a55c2a8cb72b66d7137fbcc54b82016e98eb.zip
[IA64] remove find_thread_for_addr()
find_thread_for_addr() is no longer needed. It was only used to find the correct kernel RBS for a given memory address, but since the kernel RBS is not needed any longer, this function can go away. Signed-off-by: Petr Tesarik <ptesarik@suse.cz> Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'arch/ia64/kernel/ptrace.c')
-rw-r--r--arch/ia64/kernel/ptrace.c56
1 files changed, 1 insertions, 55 deletions
diff --git a/arch/ia64/kernel/ptrace.c b/arch/ia64/kernel/ptrace.c
index 54b7ea551559..e82fe296c2c0 100644
--- a/arch/ia64/kernel/ptrace.c
+++ b/arch/ia64/kernel/ptrace.c
@@ -698,52 +698,6 @@ thread_matches (struct task_struct *thread, unsigned long addr)
}
/*
- * GDB apparently wants to be able to read the register-backing store
- * of any thread when attached to a given process. If we are peeking
- * or poking an address that happens to reside in the kernel-backing
- * store of another thread, we need to attach to that thread, because
- * otherwise we end up accessing stale data.
- *
- * task_list_lock must be read-locked before calling this routine!
- */
-static struct task_struct *
-find_thread_for_addr (struct task_struct *child, unsigned long addr)
-{
- struct task_struct *p;
- struct mm_struct *mm;
- struct list_head *this, *next;
- int mm_users;
-
- if (!(mm = get_task_mm(child)))
- return child;
-
- /* -1 because of our get_task_mm(): */
- mm_users = atomic_read(&mm->mm_users) - 1;
- if (mm_users <= 1)
- goto out; /* not multi-threaded */
-
- /*
- * Traverse the current process' children list. Every task that
- * one attaches to becomes a child. And it is only attached children
- * of the debugger that are of interest (ptrace_check_attach checks
- * for this).
- */
- list_for_each_safe(this, next, &current->children) {
- p = list_entry(this, struct task_struct, sibling);
- if (p->tgid != child->tgid)
- continue;
- if (thread_matches(p, addr)) {
- child = p;
- goto out;
- }
- }
-
- out:
- mmput(mm);
- return child;
-}
-
-/*
* Write f32-f127 back to task->thread.fph if it has been modified.
*/
inline void
@@ -1520,7 +1474,6 @@ asmlinkage long
sys_ptrace (long request, pid_t pid, unsigned long addr, unsigned long data)
{
struct pt_regs *pt;
- unsigned long peek_or_poke;
struct task_struct *child;
struct switch_stack *sw;
long ret;
@@ -1532,19 +1485,12 @@ sys_ptrace (long request, pid_t pid, unsigned long addr, unsigned long data)
goto out;
}
- peek_or_poke = (request == PTRACE_PEEKTEXT
- || request == PTRACE_PEEKDATA
- || request == PTRACE_POKETEXT
- || request == PTRACE_POKEDATA);
ret = -ESRCH;
read_lock(&tasklist_lock);
{
child = find_task_by_pid(pid);
- if (child) {
- if (peek_or_poke)
- child = find_thread_for_addr(child, addr);
+ if (child)
get_task_struct(child);
- }
}
read_unlock(&tasklist_lock);
if (!child)