From: Jiri Slaby Date: Mon, 3 Oct 2016 09:18:36 +0000 (+0200) Subject: tty: vt, compute vc offsets in advance X-Git-Tag: v5.15~12306^2~36 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=210fd7460e755c6de4972bca4ffa9cd9580279aa;p=platform%2Fkernel%2Flinux-starfive.git tty: vt, compute vc offsets in advance Only improves readability, no functional changes. Signed-off-by: Jiri Slaby Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c index 2eab714..3cb6504 100644 --- a/drivers/tty/vt/vt.c +++ b/drivers/tty/vt/vt.c @@ -4283,6 +4283,9 @@ void vc_scrolldelta_helper(struct vc_data *c, int lines, unsigned int rolled_over, void *base, unsigned int size) { unsigned long ubase = (unsigned long)base; + ptrdiff_t scr_end = (void *)c->vc_scr_end - base; + ptrdiff_t vorigin = (void *)c->vc_visible_origin - base; + ptrdiff_t origin = (void *)c->vc_origin - base; int margin = c->vc_size_row * 4; int ul, we, p, st; @@ -4293,17 +4296,16 @@ void vc_scrolldelta_helper(struct vc_data *c, int lines, } /* Do we have already enough to allow jumping from 0 to the end? */ - if (rolled_over > (c->vc_scr_end - ubase) + margin) { - ul = c->vc_scr_end - ubase; + if (rolled_over > scr_end + margin) { + ul = scr_end; we = rolled_over + c->vc_size_row; } else { ul = 0; we = size; } - p = (c->vc_visible_origin - ubase - ul + we) % we + - lines * c->vc_size_row; - st = (c->vc_origin - ubase - ul + we) % we; + p = (vorigin - ul + we) % we + lines * c->vc_size_row; + st = (origin - ul + we) % we; /* Only a little piece would be left? Show all incl. the piece! */ if (st < 2 * margin)