On Wed Feb 3, 2021 at 12:43 PM CST, Christopher M. Riedl wrote:
> Usually sigset_t is exactly 8B which is a "trivial" size and does not
> warrant using __copy_from_user(). Use __get_user() directly in
> anticipation of future work to remove the trivial size optimizations
> from __copy_from_user(). Calling __get_user() also results in a small
> boost to signal handling throughput here.
>
> Signed-off-by: Christopher M. Riedl <c...@codefail.de>
This patch triggered sparse warnings about 'different address spaces'.
This minor fixup cleans that up:
diff --git a/arch/powerpc/kernel/signal_64.c b/arch/powerpc/kernel/signal_64.c
index 42fdc4a7ff72..1dfda6403e14 100644
--- a/arch/powerpc/kernel/signal_64.c
+++ b/arch/powerpc/kernel/signal_64.c
@@ -97,7 +97,7 @@ static void prepare_setup_sigcontext(struct task_struct *tsk,
int ctx_has_vsx_re
#endif /* CONFIG_VSX */
}
-static inline int get_user_sigset(sigset_t *dst, const sigset_t *src)
+static inline int get_user_sigset(sigset_t *dst, const sigset_t __user *src)
{
if (sizeof(sigset_t) <= 8)
return __get_user(dst->sig[0], &src->sig[0]);
