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diff -Nupr src.orig/drivers/tty/n_tty.c src/drivers/tty/n_tty.c
--- src.orig/drivers/tty/n_tty.c 2017-09-22 15:27:21.084053633 -0400
+++ src/drivers/tty/n_tty.c 2017-09-22 15:27:45.888156346 -0400
@@ -2016,7 +2016,7 @@ do_it_again:
* lock themselves)
*/
-static ssize_t n_tty_write(struct tty_struct *tty, struct file *file,
+static ssize_t noinline kpatch_n_tty_write(struct tty_struct *tty, struct file *file,
const unsigned char *buf, size_t nr)
{
const unsigned char *b = buf;
@@ -2098,6 +2098,12 @@ break_out:
return (b - buf) ? b - buf : retval;
}
+static ssize_t __attribute__((optimize("-fno-optimize-sibling-calls"))) n_tty_write(struct tty_struct *tty, struct file *file,
+ const unsigned char *buf, size_t nr)
+{
+ return kpatch_n_tty_write(tty, file, buf, nr);
+}
+
/**
* n_tty_poll - poll method for N_TTY
* @tty: terminal device
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