Glibc provides an interface to extend the printf formats but this is not
standardized and does not work on musl. The code brought from kernel
uses %pV for varargs and also has own implementation of printk.
As a workaround for musl expand the pV value to a string and then
simply print it. The details are hidden behind macros:
- DECLARE_PV(vaf)
- PV_ASSIGN(vaf, format, args)
- PV_FMT in printf string
- PV_VAL in arguments
Signed-off-by: David Sterba <dsterba@suse.com>
These are the printk helpers from the kernel. There were a few
modifications, the hi-lights are
- We do not have fs_info::fs_state, so that needed to be removed.
- We do not have discard.h sync'ed yet, so that dependency was dropped.
- Anything related to struct super_block was commented out.
- The transaction abort had to be modified to fit with the current
btrfs-progs code.
- Added a btrfs_no_printk() helper to common/messages.* so that the
print statements still worked.
- The 32bit limit checkers are not needed so are behind __KERNEL__
Additionally there were kerncompat.h changes that needed to be made to
handle the dependencies properly. Those are easier to spot.
Any function that needed to be modified has a MODIFIED tag in the
comment section with a list of things that were changed.
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: David Sterba <dsterba@suse.com>
David Sterba
Josef Bacik