On Fri, Oct 30, 2015 at 10:28 AM, Borislav Petkov <[email protected]> wrote: > From: Borislav Petkov <[email protected]> > > So sparse rightfully complains that the u64 MSR value we're writing into > the STAR MSR, i.e. 0xc0000081, is being truncated: > > ./arch/x86/include/asm/msr.h:193:36: warning: cast truncates bits from > constant value (23001000000000 becomes 0)
Is this with or without: commit 47edb65178cb7056c2eea0b6c41a7d8c84547192 Author: Andy Lutomirski <[email protected]> Date: Thu Jul 23 12:14:40 2015 -0700 x86/asm/msr: Make wrmsrl() a function If that patch is applied, then I think that gcc is just being dumb and that we should consider tweaking wrmsrl to avoid generating the warning. Maybe change (u32)val to (u32)(val & 0xffffffffull)? I don't see why we should uglify the caller when the problem is some combination of gcc and the wrmsrl implementation. --Andy -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
