From: Pavel M. <pa...@uc...> - 2015-02-24 17:04:36
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On Thu 2015-01-29 14:11:25, Dave Airlie wrote: > 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 <ai...@re...> Actually... are you sure this is right fix? IOW can gcc do the optimalization behind your back and still break the buggy card? Pavel > 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 -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html |