On Wed, Nov 27, 2019 at 11:00:15AM +0200, Nikolay Borisov wrote: > > > On 26.11.19 г. 19:36 ч., Omar Sandoval wrote: > > On Tue, Nov 26, 2019 at 03:53:02PM +0200, Nikolay Borisov wrote: > >> > >> > >> On 20.11.19 г. 20:24 ч., Omar Sandoval wrote: > >>> From: Omar Sandoval <osandov@xxxxxx> > >> > >> <snip> > >> > >>> > >>> +enum { > >>> + ENCODED_IOV_COMPRESSION_NONE, > >>> +#define ENCODED_IOV_COMPRESSION_NONE ENCODED_IOV_COMPRESSION_NONE > >>> + ENCODED_IOV_COMPRESSION_ZLIB, > >>> +#define ENCODED_IOV_COMPRESSION_ZLIB ENCODED_IOV_COMPRESSION_ZLIB > >>> + ENCODED_IOV_COMPRESSION_LZO, > >>> +#define ENCODED_IOV_COMPRESSION_LZO ENCODED_IOV_COMPRESSION_LZO > >>> + ENCODED_IOV_COMPRESSION_ZSTD, > >>> +#define ENCODED_IOV_COMPRESSION_ZSTD ENCODED_IOV_COMPRESSION_ZSTD > >>> + ENCODED_IOV_COMPRESSION_TYPES = ENCODED_IOV_COMPRESSION_ZSTD, > >> > >> This looks very dodgy, what am I missing? > > > > This is a somewhat common trick so that enum values can be checked for > > with ifdef/ifndef. See include/uapi/linux.in.h, for example. > > I cannot seem to have this file on my system (or any .in.h file for that > matter in the kernel source dir). Whoops, that should be include/uapi/linux/in.h