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authorJean Delvare <khali@linux-fr.org>2009-09-22 19:47:47 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2009-09-23 10:39:56 -0400
commit0728bacbba3b0267fa8ca8be69aa43d81b57ab51 (patch)
treea0dd85cb348ad481e92a0d4f45eefdc88fac6e3d /Documentation/fb
parent0fcf6ada2b8eb42d132c0846384f1299889609e3 (diff)
matroxfb: make CONFIG_FB_MATROX_MULTIHEAD=y mandatory
I would like to get rid of option CONFIG_FB_MATROX_MULTIHEAD and just always enable it. There are many reasons for doing this: * CONFIG_FB_MATROX_MULTIHEAD=y is what all x86 distributions do, so it definitely works or we would know by now. * Building the matroxfb driver with CONFIG_FB_MATROX_MULTIHEAD not set results in the following build warning: drivers/video/matrox/matroxfb_crtc2.c: In function 'matroxfb_dh_open': drivers/video/matrox/matroxfb_crtc2.c:265: warning: the address of 'matroxfb_global_mxinfo' will always evaluate as 'true' drivers/video/matrox/matroxfb_crtc2.c: In function 'matroxfb_dh_release': drivers/video/matrox/matroxfb_crtc2.c:285: warning: the address of 'matroxfb_global_mxinfo' will always evaluate as 'true' This is nothing to be worried about, the driver will work fine, but build warnings are still annoying. * The trick to get multihead support without CONFIG_FB_MATROX_MULTIHEAD, which is described in the config help text, no longer works: you can't load the same kernel module more than once. * I fail to see how CONFIG_FB_MATROX_MULTIHEAD=y would make the code significantly slower, contrary to what the help text says. A few extra parameters on the stack here and there can't really slow things down in comaprison to the rest of the code, and register access. * The driver built without CONFIG_FB_MATROX_MULTIHEAD is larger than the driver build with CONFIG_FB_MATROX_MULTIHEAD=y by 8%. * One less configuration option makes things simpler. We add options all the time, being able to remove one for once is nice. It improves testing coverage. And I don't think the Matrox adapters are still popular enough to warrant overdetailed configuration settings. * We should be able to unobfuscate the driver code quite a bit after this change (patches follow.) Signed-off-by: Jean Delvare <khali@linux-fr.org> Acked-by: Petr Vandrovec <vandrove@vc.cvut.cz> Cc: Krzysztof Helt <krzysztof.h1@poczta.fm> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation/fb')
-rw-r--r--Documentation/fb/matroxfb.txt4
1 files changed, 1 insertions, 3 deletions
diff --git a/Documentation/fb/matroxfb.txt b/Documentation/fb/matroxfb.txt
index ad7a67707d62..e5ce8a1a978b 100644
--- a/Documentation/fb/matroxfb.txt
+++ b/Documentation/fb/matroxfb.txt
@@ -186,9 +186,7 @@ noinverse - show true colors on screen. It is default.
186dev:X - bind driver to device X. Driver numbers device from 0 up to N, 186dev:X - bind driver to device X. Driver numbers device from 0 up to N,
187 where device 0 is first `known' device found, 1 second and so on. 187 where device 0 is first `known' device found, 1 second and so on.
188 lspci lists devices in this order. 188 lspci lists devices in this order.
189 Default is `every' known device for driver with multihead support 189 Default is `every' known device.
190 and first working device (usually dev:0) for driver without
191 multihead support.
192nohwcursor - disables hardware cursor (use software cursor instead). 190nohwcursor - disables hardware cursor (use software cursor instead).
193hwcursor - enables hardware cursor. It is default. If you are using 191hwcursor - enables hardware cursor. It is default. If you are using
194 non-accelerated mode (`noaccel' or `fbset -accel false'), software 192 non-accelerated mode (`noaccel' or `fbset -accel false'), software