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Date:   Wed, 22 Nov 2017 23:32:52 -0800
From:   Nick Desaulniers <>
Cc:, Thomas Gleixner <>,,,,,,,,,
        Kees Cook <>,,,,,,,,,,,,,
        Lorenzo Stoakes <>,,
        Paolo Bonzini <>,,,
        Linux Kernel Mailing List <>
Subject: constant conversion warning in umip

Pulling down ToT, I'm seeing the following warning when building with clang:

  CC      arch/x86/lib/insn.o
arch/x86/lib/insn-eval.c:780:10: error: implicit conversion from 'int'
to 'char' changes value from 132 to -124
                return INSN_CODE_SEG_PARAMS(4, 8);
                ~~~~~~ ^~~~~~~~~~~~~~~~~~~~~~~~~~
./arch/x86/include/asm/insn-eval.h:16:57: note: expanded from macro
#define INSN_CODE_SEG_PARAMS(oper_sz, addr_sz) (oper_sz | (addr_sz << 4))

seems to be coming from commit 4efea85fb56fa "x86/insn-eval: Add
function to get default params of code segment".  Should this be an
unsigned char (as well as seg_defs in arch/x86/kernel/umip.c?  That
might be an issue for returning -EINVAL, maybe an in/out parameter
would be better?

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