linux-kernel - arch/powerpc/include/asm/page.h:24:20: warning: conversion from 'long unsigned int' to 'u16' {aka 'short unsigned int'} changes value from '262144' to '0'

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Date:   Tue, 15 Jun 2021 17:52:23 +0800
From:   kernel test robot <lkp@...el.com>
To:     Christophe Leroy <christophe.leroy@...roup.eu>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Michael Ellerman <mpe@...erman.id.au>
Subject: arch/powerpc/include/asm/page.h:24:20: warning: conversion from
 'long unsigned int' to 'u16' {aka 'short unsigned int'} changes value from
 '262144' to '0'

Hi Christophe,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   009c9aa5be652675a06d5211e1640e02bbb1c33d
commit: 4eeef098b43242ed145c83fba9989d586d707589 powerpc/44x: Remove STDBINUTILS kconfig option
date:   5 months ago
config: powerpc-randconfig-r032-20210615 (attached as .config)
compiler: powerpc-linux-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=4eeef098b43242ed145c83fba9989d586d707589
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 4eeef098b43242ed145c83fba9989d586d707589
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=powerpc 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

   In file included from arch/powerpc/include/asm/thread_info.h:13,
                    from include/linux/thread_info.h:56,
                    from include/asm-generic/preempt.h:5,
                    from ./arch/powerpc/include/generated/asm/preempt.h:1,
                    from include/linux/preempt.h:78,
                    from include/linux/spinlock.h:51,
                    from include/linux/mmzone.h:8,
                    from include/linux/gfp.h:6,
                    from include/linux/umh.h:4,
                    from include/linux/kmod.h:9,
                    from include/linux/module.h:16,
                    from drivers/net/vmxnet3/vmxnet3_drv.c:27:
   drivers/net/vmxnet3/vmxnet3_drv.c: In function 'vmxnet3_rq_init':
>> arch/powerpc/include/asm/page.h:24:20: warning: conversion from 'long unsigned int' to 'u16' {aka 'short unsigned int'} changes value from '262144' to '0' [-Woverflow]
      24 | #define PAGE_SIZE  (ASM_CONST(1) << PAGE_SHIFT)
         |                    ^
   drivers/net/vmxnet3/vmxnet3_drv.c:1784:29: note: in expansion of macro 'PAGE_SIZE'
    1784 |    rq->buf_info[0][i].len = PAGE_SIZE;
         |                             ^~~~~~~~~
>> arch/powerpc/include/asm/page.h:24:20: warning: conversion from 'long unsigned int' to 'u16' {aka 'short unsigned int'} changes value from '262144' to '0' [-Woverflow]
      24 | #define PAGE_SIZE  (ASM_CONST(1) << PAGE_SHIFT)
         |                    ^
   drivers/net/vmxnet3/vmxnet3_drv.c:1789:28: note: in expansion of macro 'PAGE_SIZE'
    1789 |   rq->buf_info[1][i].len = PAGE_SIZE;
         |                            ^~~~~~~~~


vim +24 arch/powerpc/include/asm/page.h

5cd16ee934eafc include/asm-powerpc/page.h      Michael Ellerman 2005-11-11  16  
5cd16ee934eafc include/asm-powerpc/page.h      Michael Ellerman 2005-11-11  17  /*
e12401222f749c arch/powerpc/include/asm/page.h Yuri Tikhonov    2009-01-29  18   * On regular PPC32 page size is 4K (but we support 4K/16K/64K/256K pages
555f4fdb93e70d arch/powerpc/include/asm/page.h Christophe Leroy 2019-02-21  19   * on PPC44x and 4K/16K on 8xx). For PPC64 we support either 4K or 64K software
5cd16ee934eafc include/asm-powerpc/page.h      Michael Ellerman 2005-11-11  20   * page size. When using 64K pages however, whether we are really supporting
5cd16ee934eafc include/asm-powerpc/page.h      Michael Ellerman 2005-11-11  21   * 64K pages in HW or not is irrelevant to those definitions.
5cd16ee934eafc include/asm-powerpc/page.h      Michael Ellerman 2005-11-11  22   */
555f4fdb93e70d arch/powerpc/include/asm/page.h Christophe Leroy 2019-02-21  23  #define PAGE_SHIFT		CONFIG_PPC_PAGE_SHIFT
5cd16ee934eafc include/asm-powerpc/page.h      Michael Ellerman 2005-11-11 @24  #define PAGE_SIZE		(ASM_CONST(1) << PAGE_SHIFT)
5cd16ee934eafc include/asm-powerpc/page.h      Michael Ellerman 2005-11-11  25  

:::::: The code at line 24 was first introduced by commit
:::::: 5cd16ee934eafca74a6bb790328950cec68a8b78 [PATCH] powerpc: Merge page.h

:::::: TO: Michael Ellerman <michael@...erman.id.au>
:::::: CC: Paul Mackerras <paulus@...ba.org>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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