linux-kernel - drivers/net/ethernet/meta/fbnic/fbnic_tlv.h:83:24: warning: conversion from 'long unsigned int' to 'u16' {aka 'short unsigned int'} changes value from '261632' to '65024'

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Message-ID: <202510190832.3SQkTCHe-lkp@intel.com>
Date: Sun, 19 Oct 2025 08:17:36 +0800
From: kernel test robot <lkp@...el.com>
To: Jakub Kicinski <kuba@...nel.org>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
	Paolo Abeni <pabeni@...hat.com>, Lee Trager <lee@...ger.us>,
	Simon Horman <horms@...nel.org>
Subject: drivers/net/ethernet/meta/fbnic/fbnic_tlv.h:83:24: warning:
 conversion from 'long unsigned int' to 'u16' {aka 'short unsigned int'}
 changes value from '261632' to '65024'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   1c64efcb083c48c85227cb4d72ab137feef2cdac
commit: 005a54722e9d493be58405a77f2a444e06f03be0 eth: fbnic: add FW health reporter
date:   4 weeks ago
config: powerpc-randconfig-002-20251019 (https://download.01.org/0day-ci/archive/20251019/202510190832.3SQkTCHe-lkp@intel.com/config)
compiler: powerpc-linux-gcc (GCC) 10.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251019/202510190832.3SQkTCHe-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202510190832.3SQkTCHe-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from drivers/net/ethernet/meta/fbnic/fbnic_devlink.c:12:
   drivers/net/ethernet/meta/fbnic/fbnic_devlink.c: In function 'fbnic_fw_reporter_dump':
>> drivers/net/ethernet/meta/fbnic/fbnic_tlv.h:83:24: warning: conversion from 'long unsigned int' to 'u16' {aka 'short unsigned int'} changes value from '261632' to '65024' [-Woverflow]
      83 | #define TLV_MAX_DATA   (PAGE_SIZE - 512)
         |                        ^
   drivers/net/ethernet/meta/fbnic/fbnic_devlink.c:429:31: note: in expansion of macro 'TLV_MAX_DATA'
     429 |  fw_cmpl->u.coredump.stride = TLV_MAX_DATA;
         |                               ^~~~~~~~~~~~


vim +83 drivers/net/ethernet/meta/fbnic/fbnic_tlv.h

c6203e678cc9a5 Alexander Duyck 2024-07-12  82  
c6203e678cc9a5 Alexander Duyck 2024-07-12 @83  #define TLV_MAX_DATA			(PAGE_SIZE - 512)
c6203e678cc9a5 Alexander Duyck 2024-07-12  84  #define FBNIC_TLV_ATTR_ID_UNKNOWN	USHRT_MAX
c6203e678cc9a5 Alexander Duyck 2024-07-12  85  #define FBNIC_TLV_ATTR_STRING(id, len)	{ id, len, FBNIC_TLV_STRING }
c6203e678cc9a5 Alexander Duyck 2024-07-12  86  #define FBNIC_TLV_ATTR_FLAG(id)		{ id, 0, FBNIC_TLV_FLAG }
c6203e678cc9a5 Alexander Duyck 2024-07-12  87  #define FBNIC_TLV_ATTR_U32(id)		{ id, sizeof(u32), FBNIC_TLV_UNSIGNED }
c6203e678cc9a5 Alexander Duyck 2024-07-12  88  #define FBNIC_TLV_ATTR_U64(id)		{ id, sizeof(u64), FBNIC_TLV_UNSIGNED }
c6203e678cc9a5 Alexander Duyck 2024-07-12  89  #define FBNIC_TLV_ATTR_S32(id)		{ id, sizeof(s32), FBNIC_TLV_SIGNED }
c6203e678cc9a5 Alexander Duyck 2024-07-12  90  #define FBNIC_TLV_ATTR_S64(id)		{ id, sizeof(s64), FBNIC_TLV_SIGNED }
c6203e678cc9a5 Alexander Duyck 2024-07-12  91  #define FBNIC_TLV_ATTR_MAC_ADDR(id)	{ id, ETH_ALEN, FBNIC_TLV_BINARY }
c6203e678cc9a5 Alexander Duyck 2024-07-12  92  #define FBNIC_TLV_ATTR_NESTED(id)	{ id, 0, FBNIC_TLV_NESTED }
c6203e678cc9a5 Alexander Duyck 2024-07-12  93  #define FBNIC_TLV_ATTR_ARRAY(id)	{ id, 0, FBNIC_TLV_ARRAY }
c6203e678cc9a5 Alexander Duyck 2024-07-12  94  #define FBNIC_TLV_ATTR_RAW_DATA(id)	{ id, TLV_MAX_DATA, FBNIC_TLV_BINARY }
c6203e678cc9a5 Alexander Duyck 2024-07-12  95  #define FBNIC_TLV_ATTR_LAST		{ FBNIC_TLV_ATTR_ID_UNKNOWN, 0, 0 }
c6203e678cc9a5 Alexander Duyck 2024-07-12  96  

:::::: The code at line 83 was first introduced by commit
:::::: c6203e678cc9a5bf01ec7ae382851f504870777f eth: fbnic: Add message parsing for FW messages

:::::: TO: Alexander Duyck <alexanderduyck@...com>
:::::: CC: Jakub Kicinski <kuba@...nel.org>

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki