mirror of https://gitee.com/openkylin/linux.git
0728bacbba
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> |
||
|---|---|---|
| .. | ||
| 00-INDEX | ||
| arkfb.txt | ||
| aty128fb.txt | ||
| cirrusfb.txt | ||
| cmap_xfbdev.txt | ||
| deferred_io.txt | ||
| ep93xx-fb.txt | ||
| fbcon.txt | ||
| framebuffer.txt | ||
| gxfb.txt | ||
| imacfb.txt | ||
| intel810.txt | ||
| intelfb.txt | ||
| internals.txt | ||
| lxfb.txt | ||
| matroxfb.txt | ||
| metronomefb.txt | ||
| modedb.txt | ||
| pvr2fb.txt | ||
| pxafb.txt | ||
| s3fb.txt | ||
| sa1100fb.txt | ||
| sh7760fb.txt | ||
| sisfb.txt | ||
| sstfb.txt | ||
| tgafb.txt | ||
| tridentfb.txt | ||
| uvesafb.txt | ||
| vesafb.txt | ||
| viafb.modes | ||
| viafb.txt | ||
| vt8623fb.txt | ||