On Sun, Aug 20, 2006 at 01:51:33AM -0600, Fajun Chen wrote: > I've tested mmap code in both 2.6.15.4 and 2.6.18-rc2 with > sg_vma_nopage() from 2.6.15.4, this particular sg mmap bug seems to be > fixed?$B!%!!#S#i#n#c#e!!#y#o#u#r!!#p#a#t#c#h!!#f#o#r!!#2!%#6!%#1#8!]#r#c#4!!#i#s!!essentially not different This is unreadable... > from 2.6.15.4 (the only difference is sg->offset, which is always 0 > for sg mmap or indirect IO), this should fix the problem. I'll test > your patch next week to confirm it anyway. > > I would like to also report a potential cache coherency issue on sg > when running on some processors other than i386. I ran into cache > coherency issue on ARM XScale Iop80321. I no longer touch SCSI, partly because the only SCSI based systems I have are extremely (10 years) old now. All my SCSI knowledge is based on ancient 2.4 code and is no longer relevant. > Existing sg code for direct IO: I don't think direct-IO has ever been tested and debugged on ARM either. I wouldn't know where to start with direct-IO - never used and never looked at it. And more importantly (for me), I'd rather not get into another squabble with James over cache coherency ideas, so I want to stay well away from cache coherency and block devices, thanks. -- Russell King Linux kernel 2.6 ARM Linux - http://www.arm.linux.org.uk/ maintainer of: 2.6 Serial core - To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
