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

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Message-ID: <CA+ZOyagYq0Kbsbxe20MwjeArxRP-fZtQNLZUbCdM3JSPssQuvg@mail.gmail.com>
Date:   Thu, 21 Jun 2018 18:13:02 +0800
From:   Zong Li <zongbox@...il.com>
To:     hch@...radead.org
Cc:     Zong Li <zong@...estech.com>, linux-riscv@...ts.infradead.org,
        Palmer Dabbelt <palmer@...ive.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        aou@...s.berkeley.edu, greentime@...estech.com
Subject: Re: [PATCH 5/5] RISC-V: Use fixed width integer types for 32-bit compatible

Christoph Hellwig <hch@...radead.org> 於 2018年6月21日 週四 下午2:43寫道：
>
> 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.
>

Maybe I can move to core kernel after this patch?
And I think I can rename the "PRIdX" to "PRIdXELF" to avoid ambiguous
in C definition.


> >
> >  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?
>

This relocation type was added by  Andreas, and there is some
discussions on the mail list
(ref: http://lists.infradead.org/pipermail/linux-riscv/2018-June/000706.html)

As I see it, there is truncate situation on 64-bit system, or maybe
there is no R_RISCV_32 relocation
type on 64-bit system?