From: Dave Jones Date: Sat, 25 Jun 2005 21:58:30 +0000 (-0700) Subject: [PATCH] Fix vesafb/mtrr scaling problem. X-Git-Tag: v2.6.13-rc1~68^2~85 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d7496cb75ec75b1e74283a481fb02f5d7ce7bdeb;p=linux-2.6 [PATCH] Fix vesafb/mtrr scaling problem. vesafb will do really silly things like.. mtrr: type mismatch for e0000000,8000000 old: write-back new: write-combining mtrr: type mismatch for e0000000,4000000 old: write-back new: write-combining mtrr: type mismatch for e0000000,2000000 old: write-back new: write-combining mtrr: type mismatch for e0000000,1000000 old: write-back new: write-combining mtrr: type mismatch for e0000000,800000 old: write-back new: write-combining mtrr: type mismatch for e0000000,400000 old: write-back new: write-combining mtrr: type mismatch for e0000000,200000 old: write-back new: write-combining mtrr: type mismatch for e0000000,100000 old: write-back new: write-combining mtrr: type mismatch for e0000000,80000 old: write-back new: write-combining mtrr: type mismatch for e0000000,40000 old: write-back new: write-combining mtrr: type mismatch for e0000000,20000 old: write-back new: write-combining mtrr: type mismatch for e0000000,10000 old: write-back new: write-combining mtrr: type mismatch for e0000000,8000 old: write-back new: write-combining mtrr: type mismatch for e0000000,4000 old: write-back new: write-combining mtrr: type mismatch for e0000000,2000 old: write-back new: write-combining mtrr: type mismatch for e0000000,1000 old: write-back new: write-combining mtrr: size and base must be multiples of 4 kiB mtrr: size: 0x800 base: 0xe0000000 mtrr: size and base must be multiples of 4 kiB mtrr: size: 0x400 base: 0xe0000000 mtrr: size and base must be multiples of 4 kiB mtrr: size: 0x200 base: 0xe0000000 mtrr: size and base must be multiples of 4 kiB mtrr: size: 0x100 base: 0xe0000000 mtrr: size and base must be multiples of 4 kiB mtrr: size: 0x80 base: 0xe0000000 mtrr: size and base must be multiples of 4 kiB mtrr: size: 0x40 base: 0xe0000000 mtrr: size and base must be multiples of 4 kiB mtrr: size: 0x20 base: 0xe0000000 mtrr: size and base must be multiples of 4 kiB mtrr: size: 0x10 base: 0xe0000000 mtrr: size and base must be multiples of 4 kiB mtrr: size: 0x8 base: 0xe0000000 mtrr: size and base must be multiples of 4 kiB mtrr: size: 0x4 base: 0xe0000000 mtrr: size and base must be multiples of 4 kiB mtrr: size: 0x2 base: 0xe0000000 mtrr: size and base must be multiples of 4 kiB mtrr: size: 0x1 base: 0xe0000000 Stop scaling down at PAGE_SIZE. Also fix up some broken indentation. Signed-off-by: Dave Jones Cc: Alexey Dobriyan Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/drivers/video/vesafb.c b/drivers/video/vesafb.c index f3069b01e2..9ed1a931dd 100644 --- a/drivers/video/vesafb.c +++ b/drivers/video/vesafb.c @@ -389,10 +389,11 @@ static int __init vesafb_probe(struct device *device) unsigned int temp_size = size_total; /* Find the largest power-of-two */ while (temp_size & (temp_size - 1)) - temp_size &= (temp_size - 1); - - /* Try and find a power of two to add */ - while (temp_size && mtrr_add(vesafb_fix.smem_start, temp_size, MTRR_TYPE_WRCOMB, 1)==-EINVAL) { + temp_size &= (temp_size - 1); + + /* Try and find a power of two to add */ + while (temp_size > PAGE_SIZE && + mtrr_add(vesafb_fix.smem_start, temp_size, MTRR_TYPE_WRCOMB, 1)==-EINVAL) { temp_size >>= 1; } }