From: Bartlomiej Zolnierkiewicz Date: Sat, 26 Jan 2008 19:13:09 +0000 (+0100) Subject: ide: remove broken disk byte-swapping support X-Git-Tag: v2.6.25-rc1~1227^2~19 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9e47be0c97f7357b80e91dc0632e9cce2eb025e0;p=pandora-kernel.git ide: remove broken disk byte-swapping support Remove broken disk byte-swapping support: - it can cause a data corruption on SMP (or if using PREEMPT on UP) - all data coming from disk are byte-swapped by taskfile_*_data() which results in incorrect identify data being reported by /proc/ide/ and IOCTLs - "hdx=bswap/byteswap" kernel parameter has been broken on m68k host drivers (including Atari/Q40 ones) since 2.5.x days (because of 'hwif' zero-ing) - byte-swapping is limited to PIO transfers (for working with TiVo disks on x86 machines using user-space solutions or dm-byteswap should result in much better performance because DMA can be used) For previous discussions please see: http://www.ussg.iu.edu/hypermail/linux/kernel/0201.0/0768.html http://lkml.org/lkml/2004/2/28/111 [ I have dm-byteswap device mapper target if somebody is interested (patch is for 2.6.4 though but I'll dust it off if needed). ] Acked-by: Sergei Shtylyov Signed-off-by: Bartlomiej Zolnierkiewicz --- Reading git-diff-tree failed