linux-kernel - [ardb:arm64-ro-page-tables-pkvm-v5.17 16/26] arch/arm64/kvm/mmu.c:517:13: warning: no previous prototype for 'kvm_hyp_debug_uart_set

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Message-ID: <202201291152.MDHD6psp-lkp@intel.com>
Date:   Sat, 29 Jan 2022 11:31:48 +0800
From:   kernel test robot <lkp@...el.com>
To:     Will Deacon <will@...nel.org>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Ard Biesheuvel <ardb@...nel.org>
Subject: [ardb:arm64-ro-page-tables-pkvm-v5.17 16/26]
 arch/arm64/kvm/mmu.c:517:13: warning: no previous prototype for
 'kvm_hyp_debug_uart_set_basep'

tree:   git://git.kernel.org/pub/scm/linux/kernel/git/ardb/linux.git arm64-ro-page-tables-pkvm-v5.17
head:   b38f2df95cbf61e70bc32017da5318d1cb03e3e3
commit: ed0901f32dbd42aab0cd95a848ea943273062b2f [16/26] [DONOTMERGE] KVM: arm64: Add debug UART hacks at EL2
config: arm64-allyesconfig (https://download.01.org/0day-ci/archive/20220129/202201291152.MDHD6psp-lkp@intel.com/config)
compiler: aarch64-linux-gcc (GCC) 11.2.0
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/ardb/linux.git/commit/?id=ed0901f32dbd42aab0cd95a848ea943273062b2f
        git remote add ardb git://git.kernel.org/pub/scm/linux/kernel/git/ardb/linux.git
        git fetch --no-tags ardb arm64-ro-page-tables-pkvm-v5.17
        git checkout ed0901f32dbd42aab0cd95a848ea943273062b2f
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=arm64 SHELL=/bin/bash arch/arm64/kvm/

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 >>):

>> arch/arm64/kvm/mmu.c:517:13: warning: no previous prototype for 'kvm_hyp_debug_uart_set_basep' [-Wmissing-prototypes]
     517 | void __init kvm_hyp_debug_uart_set_basep(struct alt_instr *alt,
         |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
   In file included from arch/arm64/include/asm/kvm_host.h:28,
                    from include/linux/kvm_host.h:43,
                    from arch/arm64/kvm/mmu.c:8:
   arch/arm64/kvm/mmu.c: In function 'kvm_hyp_debug_uart_set_basep':
>> arch/arm64/include/asm/kvm_asm.h:183:29: warning: initialization of 'void *' from 'long unsigned int' makes pointer from integer without a cast [-Wint-conversion]
     183 |                 void *val = (ptr);                                      \
         |                             ^
   arch/arm64/kvm/mmu.c:522:25: note: in expansion of macro 'kvm_ksym_ref'
     522 |         u64 addr = (u64)kvm_ksym_ref(arm64_kvm_hyp_debug_uart_addr);
         |                         ^~~~~~~~~~~~
   arch/arm64/include/asm/kvm_asm.h:183:29: note: (near initialization for 'addr')
     183 |                 void *val = (ptr);                                      \
         |                             ^
   arch/arm64/kvm/mmu.c:522:25: note: in expansion of macro 'kvm_ksym_ref'
     522 |         u64 addr = (u64)kvm_ksym_ref(arm64_kvm_hyp_debug_uart_addr);
         |                         ^~~~~~~~~~~~


vim +/kvm_hyp_debug_uart_set_basep +517 arch/arm64/kvm/mmu.c

   516	
 > 517	void __init kvm_hyp_debug_uart_set_basep(struct alt_instr *alt,
   518						 __le32 *origptr, __le32 *updptr,
   519						 int nr_inst)
   520	{
   521		int i;
   522		u64 addr = (u64)kvm_ksym_ref(arm64_kvm_hyp_debug_uart_addr);
   523	
   524		BUG_ON(nr_inst != 4);
   525	
   526		for (i = 0; i < 4; ++i) {
   527			u32 insn = le32_to_cpu(origptr[i]);
   528	
   529			insn = aarch64_insn_encode_immediate(AARCH64_INSN_IMM_16,
   530							     insn,
   531							     addr & 0xffff);
   532			BUG_ON(insn == AARCH64_BREAK_FAULT);
   533			updptr[i] = cpu_to_le32(insn);
   534			addr >>= 16;
   535		}
   536	}
   537	

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