[RFC PATCH v4 01/13] ptrace: Use regset_size() for dynamic regset size.

[Greentime Hu]

It uses regset_size() instead of using regset->n and regset->size directly.
In this case, it will call the get_size() ported by arch dynamically to
support dynamic regset size case.

Signed-off-by: Greentime Hu <greentime.hu@xxxxxxxxxx>
---
 kernel/ptrace.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index 43d6179508d6..6877105e1b1e 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -882,13 +882,18 @@ static int ptrace_regset(struct task_struct *task, int req, unsigned int type,
 	const struct user_regset_view *view = task_user_regset_view(task);
 	const struct user_regset *regset = find_regset(view, type);
 	int regset_no;
+	unsigned int size;
 
-	if (!regset || (kiov->iov_len % regset->size) != 0)
+	if (!regset)
 		return -EINVAL;
 
 	regset_no = regset - view->regsets;
-	kiov->iov_len = min(kiov->iov_len,
-			    (__kernel_size_t) (regset->n * regset->size));
+	size = regset_size(task, regset);
+
+	if ((kiov->iov_len % size) != 0)
+		return -EINVAL;
+
+	kiov->iov_len = min(kiov->iov_len, (__kernel_size_t) size);
 
 	if (req == PTRACE_GETREGSET)
 		return copy_regset_to_user(task, view, regset_no, 0,
-- 
2.26.2