tty: vt, rename variables to sane names
This makes the code understandable at least. No functional changes. Signed-off-by: Jiri Slaby <jslaby@suse.cz> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -4287,7 +4287,7 @@ void vc_scrolldelta_helper(struct vc_data *c, int lines,
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ptrdiff_t vorigin = (void *)c->vc_visible_origin - base;
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ptrdiff_t origin = (void *)c->vc_origin - base;
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int margin = c->vc_size_row * 4;
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int ul, we, p, st;
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int from, wrap, from_off, avail;
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/* Turn scrollback off */
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if (!lines) {
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@ -4297,25 +4297,25 @@ void vc_scrolldelta_helper(struct vc_data *c, int lines,
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/* Do we have already enough to allow jumping from 0 to the end? */
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if (rolled_over > scr_end + margin) {
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ul = scr_end;
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we = rolled_over + c->vc_size_row;
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from = scr_end;
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wrap = rolled_over + c->vc_size_row;
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} else {
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ul = 0;
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we = size;
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from = 0;
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wrap = size;
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}
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p = (vorigin - ul + we) % we + lines * c->vc_size_row;
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st = (origin - ul + we) % we;
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from_off = (vorigin - from + wrap) % wrap + lines * c->vc_size_row;
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avail = (origin - from + wrap) % wrap;
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/* Only a little piece would be left? Show all incl. the piece! */
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if (st < 2 * margin)
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if (avail < 2 * margin)
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margin = 0;
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if (p < margin)
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p = 0;
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if (p > st - margin)
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p = st;
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if (from_off < margin)
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from_off = 0;
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if (from_off > avail - margin)
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from_off = avail;
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c->vc_visible_origin = ubase + (p + ul) % we;
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c->vc_visible_origin = ubase + (from + from_off) % wrap;
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}
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EXPORT_SYMBOL_GPL(vc_scrolldelta_helper);
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