linux-kernel - arch/powerpc/platforms/powernv/opal-fadump.h:138:25: sparse: sparse: cast from restricted _

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Date:   Tue, 14 Jun 2022 23:03:25 +0800
From:   kernel test robot <lkp@...el.com>
To:     Hari Bathini <hbathini@...ux.ibm.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Michael Ellerman <mpe@...erman.id.au>
Subject: arch/powerpc/platforms/powernv/opal-fadump.h:138:25: sparse: sparse:
 cast from restricted __be64

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   b13baccc3850ca8b8cccbf8ed9912dbaa0fdf7f3
commit: b74196af372f7cb4902179009265fe63ac81824f powerpc/fadump: Fix fadump to work with a different endian capture kernel
date:   7 weeks ago
config: powerpc64-randconfig-s032-20220613 (https://download.01.org/0day-ci/archive/20220614/202206142217.Y5HsfbXB-lkp@intel.com/config)
compiler: powerpc64le-linux-gcc (GCC) 11.3.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # apt-get install sparse
        # sparse version: v0.6.4-30-g92122700-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b74196af372f7cb4902179009265fe63ac81824f
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout b74196af372f7cb4902179009265fe63ac81824f
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=powerpc SHELL=/bin/bash arch/powerpc/kvm/ arch/powerpc/platforms/powernv/

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


sparse warnings: (new ones prefixed by >>)
   arch/powerpc/platforms/powernv/opal-fadump.c: note: in included file:
>> arch/powerpc/platforms/powernv/opal-fadump.h:138:25: sparse: sparse: cast from restricted __be64

vim +138 arch/powerpc/platforms/powernv/opal-fadump.h

   123	
   124	static inline void opal_fadump_read_regs(char *bufp, unsigned int regs_cnt,
   125						 unsigned int reg_entry_size,
   126						 bool cpu_endian,
   127						 struct pt_regs *regs)
   128	{
   129		struct hdat_fadump_reg_entry *reg_entry;
   130		u64 val;
   131		int i;
   132	
   133		memset(regs, 0, sizeof(struct pt_regs));
   134	
   135		for (i = 0; i < regs_cnt; i++, bufp += reg_entry_size) {
   136			reg_entry = (struct hdat_fadump_reg_entry *)bufp;
   137			val = (cpu_endian ? be64_to_cpu(reg_entry->reg_val) :
 > 138			       (u64)(reg_entry->reg_val));
   139			opal_fadump_set_regval_regnum(regs,
   140						      be32_to_cpu(reg_entry->reg_type),
   141						      be32_to_cpu(reg_entry->reg_num),
   142						      val);
   143		}
   144	}
   145	

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