[PATCH 3.18 022/124] c6x/ptrace: Remove useless PTRACE_SETREGSET implementation

[Greg Kroah-Hartman]

3.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Dave Martin <dave.mar...@arm.com>

commit fb411b837b587a32046dc4f369acb93a10b1def8 upstream.

gpr_set won't work correctly and can never have been tested, and the
correct behaviour is not clear due to the endianness-dependent task
layout.

So, just remove it.  The core code will now return -EOPNOTSUPPORT when
trying to set NT_PRSTATUS on this architecture until/unless a correct
implementation is supplied.

Signed-off-by: Dave Martin <dave.mar...@arm.com>
Signed-off-by: Linus Torvalds <torva...@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 arch/c6x/kernel/ptrace.c |   41 -----------------------------------------
 1 file changed, 41 deletions(-)

--- a/arch/c6x/kernel/ptrace.c
+++ b/arch/c6x/kernel/ptrace.c
@@ -69,46 +69,6 @@ static int gpr_get(struct task_struct *t
                                   0, sizeof(*regs));
 }
 
-static int gpr_set(struct task_struct *target,
-                  const struct user_regset *regset,
-                  unsigned int pos, unsigned int count,
-                  const void *kbuf, const void __user *ubuf)
-{
-       int ret;
-       struct pt_regs *regs = task_pt_regs(target);
-
-       /* Don't copyin TSR or CSR */
-       ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
-                                &regs,
-                                0, PT_TSR * sizeof(long));
-       if (ret)
-               return ret;
-
-       ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
-                                       PT_TSR * sizeof(long),
-                                       (PT_TSR + 1) * sizeof(long));
-       if (ret)
-               return ret;
-
-       ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
-                                &regs,
-                                (PT_TSR + 1) * sizeof(long),
-                                PT_CSR * sizeof(long));
-       if (ret)
-               return ret;
-
-       ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
-                                       PT_CSR * sizeof(long),
-                                       (PT_CSR + 1) * sizeof(long));
-       if (ret)
-               return ret;
-
-       ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
-                                &regs,
-                                (PT_CSR + 1) * sizeof(long), -1);
-       return ret;
-}
-
 enum c6x_regset {
        REGSET_GPR,
 };
@@ -120,7 +80,6 @@ static const struct user_regset c6x_regs
                .size = sizeof(u32),
                .align = sizeof(u32),
                .get = gpr_get,
-               .set = gpr_set
        },
 };