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powerpc/ptrace: Simplify gpr_get()/tm_cgpr_get()

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gpr_get() does membuf_write() twice to override pt_regs->msr in
between. We can call membuf_write() once and change ->msr in the
kernel buffer, this simplifies the code and the next fix.

The patch adds a new simple helper, membuf_at(offs), it returns the
new membuf which can be safely used after membuf_write().

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
[mpe: Fixup some minor whitespace issues noticed by Christophe]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20201119160221.GA5188@redhat.com
This commit is contained in:
Oleg Nesterov
2020-11-19 17:02:21 +01:00
committed by Michael Ellerman
parent 20fa40b147
commit 640586f8af
3 changed files with 19 additions and 15 deletions
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12
include/linux/regset.h
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@@ -46,6 +46,18 @@ static inline int membuf_write(struct membuf *s, const void *v, size_t size)
return s->left;
}
static inline struct membuf membuf_at(const struct membuf *s, size_t offs)
{
struct membuf n = *s;
if (offs > n.left)
offs = n.left;
n.p += offs;
n.left -= offs;
return n;
}
/* current s->p must be aligned for v; v must be a scalar */
#define membuf_store(s, v) \
({ \