From: Dave Airlie <airlied@redhat.com>
To: torvalds@linux-foundation.org
Cc: linux-kernel@vger.kernel.org, dri-devel@lists.sf.net,
Dave Airlie <airlied@redhat.com>
Subject: [PATCH] vt_buffer: drop console buffer copying optimisations
Date: Thu, 29 Jan 2015 14:11:25 +1000 [thread overview]
Message-ID: <1422504685-7864-1-git-send-email-airlied@redhat.com> (raw)
These two copy to/from VGA memory, however on the Silicon
Motion SMI750 VGA card on a 64-bit system cause console corruption.
This is due to the hw being buggy and not handling a 64-bit transaction
correctly.
We could try and create a 32-bit version of these routines,
but I'm not sure the optimisation is worth much today.
Fixes https://bugzilla.redhat.com/show_bug.cgi?id=1132826
Tested-by: Huawei engineering.
Signed-off-by: Dave Airlie <airlied@redhat.com>
---
Linus, this came up a while back I finally got some confirmation
that it fixes those servers.
include/linux/vt_buffer.h | 4 ----
1 file changed, 4 deletions(-)
diff --git a/include/linux/vt_buffer.h b/include/linux/vt_buffer.h
index 057db7d..f38c10b 100644
--- a/include/linux/vt_buffer.h
+++ b/include/linux/vt_buffer.h
@@ -21,10 +21,6 @@
#ifndef VT_BUF_HAVE_RW
#define scr_writew(val, addr) (*(addr) = (val))
#define scr_readw(addr) (*(addr))
-#define scr_memcpyw(d, s, c) memcpy(d, s, c)
-#define scr_memmovew(d, s, c) memmove(d, s, c)
-#define VT_BUF_HAVE_MEMCPYW
-#define VT_BUF_HAVE_MEMMOVEW
#endif
#ifndef VT_BUF_HAVE_MEMSETW
--
1.9.3
next reply other threads:[~2015-01-29 4:11 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-29 4:11 Dave Airlie [this message]
2015-01-29 12:06 ` [PATCH] vt_buffer: drop console buffer copying optimisations Peter Hurley
2015-01-29 23:40 ` Linus Torvalds
2015-01-29 23:57 ` Greg Kroah-Hartman
2015-01-30 0:03 ` Linus Torvalds
2015-01-30 0:14 ` Dave Airlie
2015-02-03 15:54 ` One Thousand Gnomes
2015-02-05 9:01 ` Geert Uytterhoeven
2015-02-05 11:35 ` One Thousand Gnomes
2015-02-09 10:35 ` Daniel Stone
2015-02-09 10:49 ` Geert Uytterhoeven
2015-02-09 11:00 ` Daniel Stone
2015-02-09 20:17 ` One Thousand Gnomes
2015-02-24 16:49 ` Pavel Machek
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