linux-kernel - Re: [PATCH 5/5] RISC-V: Use fixed width integer types for 32-bit compatible

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Date:   Wed, 20 Jun 2018 23:43:22 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Zong Li <zong@...estech.com>
Cc:     palmer@...ive.com, aou@...s.berkeley.edu,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        greentime@...estech.com
Subject: Re: [PATCH 5/5] RISC-V: Use fixed width integer types for 32-bit
 compatible

On Thu, Jun 21, 2018 at 09:41:46AM +0800, Zong Li wrote:
> Use fixed width integer types for print format on 32/64 bit
> to fix warning about format compatible.
> 
> Like inttypes.h, but more simpler for RISC-V usage.
> 
> Signed-off-by: Zong Li <zong@...estech.com>
> ---
>  arch/riscv/include/asm/format.h | 20 ++++++++++++++++++++
>  arch/riscv/kernel/module.c      | 13 +++++++------
>  2 files changed, 27 insertions(+), 6 deletions(-)
>  create mode 100644 arch/riscv/include/asm/format.h
> 
> diff --git a/arch/riscv/include/asm/format.h b/arch/riscv/include/asm/format.h
> new file mode 100644
> index 000000000000..9b68ca7fac46
> --- /dev/null
> +++ b/arch/riscv/include/asm/format.h
> @@ -0,0 +1,20 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/* Copyright (C) 2018 Andes Technology Corporation */
> +
> +#ifndef _ASM_RISCV_FORMAT_H
> +#define _ASM_RISCV_FORMAT_H
> +
> +#if __riscv_xlen == 64
> +#define __PRI_PREFIX	"ll"
> +#else
> +#define __PRI_PREFIX
> +#endif
> +
> +#define PRIdX	__PRI_PREFIX "d"
> +#define PRIiX	__PRI_PREFIX "i"
> +#define PRIuX	__PRI_PREFIX "u"
> +#define PRIoX	__PRI_PREFIX "o"
> +#define PRIxX	__PRI_PREFIX "x"
> +#define PRIXX	__PRI_PREFIX "X"
> +
> +#endif /* _ASM_RISCV_FORMAT_H */

If you want these prefixed submit them to the core kernel, not
under asm/ for RISC-V.

>  
>  static int apply_r_riscv_32_rela(struct module *me, u32 *location, Elf_Addr v)
>  {
>  	if (v != (u32)v) {
> -		pr_err("%s: value %016llx out of range for 32-bit field\n",
> +		pr_err("%s: value %016" PRIxX "out of range for 32-bit field\n",
>  		       me->name, v);
>  		return -EINVAL;

But in general Linux uXX and sXX values are always the same underlying
fundamental C type.  What is the mismatch here?