From: David Laight > Sent: 08 February 2021 09:10 > > From: Willy Tarreau > > Sent: 06 February 2021 13:23 > > > > On Sat, Feb 06, 2021 at 02:11:13PM +0100, Willy Tarreau wrote: > > > Something like this looks more robust to me, it will use SUBLEVEL for > > > values 0 to 255 and 255 for any larger value: > > > > diff --git a/Makefile b/Makefile > > index 7d86ad6ad36c..9b91b8815b40 100644 > > --- a/Makefile > > +++ b/Makefile > > @@ -1252,7 +1252,7 @@ endef > > > > define filechk_version.h > > echo \#define LINUX_VERSION_CODE $(shell \ > > - expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ > > + expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 255 \* \( 0$(SUBLEVEL) \> 255 \) + > > 0$(SUBLEVEL) \* \( 0$(SUBLEVEL) \<= 255 \) ); \ > > echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))' > > endef > > Why not: > $(shell echo $$(($(VERSION)<<16 + $(PATCHLEVEL)<<8 + ($(SUBVERSION) < 255 ? $(SUBVERSION) : > 255)))) > Untested, but I think only the one $ needs any kind of escape. > The extra leading zeros do have to go - $((...)) does octal :-( Or probably even better: echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + ((c) > 255 ? 255 : (c)))' echo '#define LINUX_VERSION_CODE KERNEL_VERSION($(VERSION), $(PATCHLEVEL)+0, $(SUBLEVEL)+0)' Which gets rid of the $(shell) as well. David - Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK Registration No: 1397386 (Wales)
