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Subject[PATCH 07/41] [ia64] access_uarea(): stop bothering with gpregs_[gs]et()
Date
From: Al Viro <viro@zeniv.linux.org.uk>

We know this won't be called for child == current, so we don't need
to bother with callbacks, etc. - just do unw_init_from_blocked_task(),
unw_unwind_to_user() and do the payload of gpregs_[gs]et(). For
one register. Which is to say, access_elf_reg().

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
arch/ia64/kernel/ptrace.c | 17 ++++++++---------
1 file changed, 8 insertions(+), 9 deletions(-)

diff --git a/arch/ia64/kernel/ptrace.c b/arch/ia64/kernel/ptrace.c
index be635f6f93c9..e0813c8e4b47 100644
--- a/arch/ia64/kernel/ptrace.c
+++ b/arch/ia64/kernel/ptrace.c
@@ -1936,15 +1936,14 @@ access_uarea(struct task_struct *child, unsigned long addr,
}

if (pos != -1) {
- if (write_access)
- ret = gpregs_set(child, NULL, pos,
- sizeof(unsigned long), data, NULL);
- else
- ret = gpregs_get(child, NULL, pos,
- sizeof(unsigned long), data, NULL);
- if (ret != 0)
- return -1;
- return 0;
+ struct unw_frame_info info;
+
+ memset(&info, 0, sizeof(info));
+ unw_init_from_blocked_task(&info, child);
+ if (unw_unwind_to_user(&info) < 0)
+ return 0;
+
+ return access_elf_reg(child, &info, pos, data, write_access);
}

/* access debug registers */
--
2.11.0
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