>>>>>> "Richard" == Richard Moore <[email protected]> writes: > > > Hi, > > Would it be possible to please make the recent mdev change in v1.26 an > > option? > > > * mdev (mdev: create devices from /sys/dev) commit 20a3262 (Sep 7, > 2016) > > > I am stuck with a v2.6.2x kernel and I am sure other people must be too > > who have no /sys/dev support in their kernel ? > > /sys/dev support got added in 2.6.27-rc1 (July 2008), E.G. ~9 years ago: > > commit e105b8bfc769b0545b6f0f395179d1e43cbee822 > Author: Dan Williams <[email protected]> > Date: Mon Apr 21 10:51:07 2008 -0700 > > sysfs: add /sys/dev/{char,block} to lookup sysfs path by major:minor > > Why?: > There are occasions where userspace would like to access sysfs > attributes for a device but it may not know how sysfs has named the > device or the path. For example what is the sysfs path for > /dev/disk/by-id/ata-ST3160827AS_5MT004CK? With this change a call to > stat(2) returns the major:minor then userspace can see that > /sys/dev/block/8:32 links to /sys/block/sdc. > > What are the alternatives?: > 1/ Add an ioctl to return the path: Doable, but sysfs is meant to > reduce > the need to proliferate ioctl interfaces into the kernel, so this > seems counter productive. > > 2/ Use udev to create these symlinks: Also doable, but it adds a > udev dependency to utilities that might be running in a limited > environment like an initramfs. > > 3/ Do a full-tree search of sysfs. > > [[email protected]: fix duplicate registrations] > [[email protected]: cleanup suggestions] > > Cc: Neil Brown <[email protected]> > Cc: Tejun Heo <[email protected]> > Acked-by: Kay Sievers <[email protected]> > Reviewed-by: SL Baur <[email protected]> > Acked-by: Kay Sievers <[email protected]> > Acked-by: Mark Lord <[email protected]> > Acked-by: H. Peter Anvin <[email protected]> > Signed-off-by: Dan Williams <[email protected]> > Signed-off-by: Greg Kroah-Hartman <[email protected]> > > Does it really make sense to mix such an ancient kernel with a modern > busybox? Why not just backport this kernel commit? > > -- > Bye, Peter Korsgaard >
Hi Peter, Thank you for the reply and suggestion, I tried backporting above but too many code changes needed for my comfort level. (I have ended up just reversing the mdev patch, which worked ok if anyone needs to do it) I have stepped through many revisions of Busybox but this was the first one that left me with a bricked router (firmware) so I thought I really should post. Could there at least be a small warning on the main busybox.net page to make people aware to look at the changelog, perhaps something like ; 'Please note full support for 2.6.2x and older kernels is now being deprecated from 1.26 onwards' Thanks Rich _______________________________________________ busybox mailing list [email protected] http://lists.busybox.net/mailman/listinfo/busybox
