arch/mips/kernel/relocate.c:41:12: warning: no previous prototype for function 'plat_post_relocation'

From: kernel test robot
Date: Mon Jan 24 2022 - 10:32:57 EST

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Hi Jinyang,

FYI, the error/warning still remains.

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: dd81e1c7d5fb126e5fbc5c9e334d7b3ec29a16a0
commit: a307a4ce9ecd2e23c71318201330d9d648b3f818 MIPS: Loongson64: Add KASLR support
date: 1 year, 2 months ago
config: mips-randconfig-c004-20220120 (https://download.01.org/0day-ci/archive/20220124/202201242332.W7XuI6gI-lkp@xxxxxxxxx/config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project f7b7138a62648f4019c55e4671682af1f851f295)
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
# install mips cross compiling tool for clang build
# apt-get install binutils-mips-linux-gnu
# https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a307a4ce9ecd2e23c71318201330d9d648b3f818
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout a307a4ce9ecd2e23c71318201330d9d648b3f818
# save the config file to linux build tree
mkdir build_dir
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=mips SHELL=/bin/bash arch/mips/

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

All warnings (new ones prefixed by >>):

In file included from include/asm-generic/preempt.h:5:
In file included from include/linux/thread_info.h:38:
In file included from arch/mips/include/asm/thread_info.h:16:
In file included from arch/mips/include/asm/processor.h:14:
In file included from include/linux/atomic.h:7:
arch/mips/include/asm/atomic.h:257:1: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare]
ATOMIC_SIP_OP(atomic, int, subu, ll, sc)
^
arch/mips/include/asm/atomic.h:251:7: note: expanded from macro 'ATOMIC_SIP_OP'
if (!__SYNC_loongson3_war) \
^
arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war'
# define __SYNC_loongson3_war (1 << 31)
^
In file included from arch/mips/kernel/relocate.c:12:
In file included from arch/mips/include/asm/cacheflush.h:13:
In file included from include/linux/mm.h:10:
In file included from include/linux/gfp.h:6:
In file included from include/linux/mmzone.h:8:
In file included from include/linux/spinlock.h:51:
In file included from include/linux/preempt.h:78:
In file included from ./arch/mips/include/generated/asm/preempt.h:1:
In file included from include/asm-generic/preempt.h:5:
In file included from include/linux/thread_info.h:38:
In file included from arch/mips/include/asm/thread_info.h:16:
In file included from arch/mips/include/asm/processor.h:14:
In file included from include/linux/atomic.h:7:
arch/mips/include/asm/atomic.h:261:1: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare]
ATOMIC_SIP_OP(atomic64, s64, dsubu, lld, scd)
^
arch/mips/include/asm/atomic.h:251:7: note: expanded from macro 'ATOMIC_SIP_OP'
if (!__SYNC_loongson3_war) \
^
arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war'
# define __SYNC_loongson3_war (1 << 31)
^
In file included from arch/mips/kernel/relocate.c:12:
In file included from arch/mips/include/asm/cacheflush.h:13:
In file included from include/linux/mm.h:10:
In file included from include/linux/gfp.h:6:
In file included from include/linux/mmzone.h:8:
In file included from include/linux/spinlock.h:59:
In file included from include/linux/lockdep.h:14:
In file included from include/linux/smp.h:15:
In file included from include/linux/smp_types.h:5:
include/linux/llist.h:222:9: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare]
return xchg(&head->first, NULL);
^
arch/mips/include/asm/cmpxchg.h:102:7: note: expanded from macro 'xchg'
if (!__SYNC_loongson3_war) \
^
arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war'
# define __SYNC_loongson3_war (1 << 31)
^
In file included from arch/mips/kernel/relocate.c:12:
In file included from arch/mips/include/asm/cacheflush.h:13:
In file included from include/linux/mm.h:10:
In file included from include/linux/gfp.h:6:
In file included from include/linux/mmzone.h:8:
In file included from include/linux/spinlock.h:59:
In file included from include/linux/lockdep.h:27:
include/linux/debug_locks.h:17:9: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare]
return xchg(&debug_locks, 0);
^
arch/mips/include/asm/cmpxchg.h:102:7: note: expanded from macro 'xchg'
if (!__SYNC_loongson3_war) \
^
arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war'
# define __SYNC_loongson3_war (1 << 31)
^
In file included from arch/mips/kernel/relocate.c:12:
In file included from arch/mips/include/asm/cacheflush.h:13:
In file included from include/linux/mm.h:33:
In file included from include/linux/pgtable.h:6:
arch/mips/include/asm/pgtable.h:200:3: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare]
cmpxchg64(&buddy->pte, 0, _PAGE_GLOBAL);
^
arch/mips/include/asm/cmpxchg.h:220:2: note: expanded from macro 'cmpxchg64'
cmpxchg((ptr), (o), (n)); \
^
arch/mips/include/asm/cmpxchg.h:194:7: note: expanded from macro 'cmpxchg'
if (!__SYNC_loongson3_war) \
^
arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war'
# define __SYNC_loongson3_war (1 << 31)
^
In file included from arch/mips/kernel/relocate.c:12:
In file included from arch/mips/include/asm/cacheflush.h:13:
In file included from include/linux/mm.h:33:
In file included from include/linux/pgtable.h:6:
arch/mips/include/asm/pgtable.h:200:3: warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare]
arch/mips/include/asm/cmpxchg.h:220:2: note: expanded from macro 'cmpxchg64'
cmpxchg((ptr), (o), (n)); \
^
arch/mips/include/asm/cmpxchg.h:204:7: note: expanded from macro 'cmpxchg'
if (!__SYNC_loongson3_war) \
^
arch/mips/include/asm/sync.h:147:34: note: expanded from macro '__SYNC_loongson3_war'
# define __SYNC_loongson3_war (1 << 31)
^
>> arch/mips/kernel/relocate.c:41:12: warning: no previous prototype for function 'plat_post_relocation' [-Wmissing-prototypes]
int __weak plat_post_relocation(long offset)
^
arch/mips/kernel/relocate.c:41:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
int __weak plat_post_relocation(long offset)
^
static
arch/mips/kernel/relocate.c:135:12: warning: no previous prototype for function 'do_relocations' [-Wmissing-prototypes]
int __init do_relocations(void *kbase_old, void *kbase_new, long offset)
^
arch/mips/kernel/relocate.c:135:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
int __init do_relocations(void *kbase_old, void *kbase_new, long offset)
^
static
>> arch/mips/kernel/relocate.c:304:14: warning: no previous prototype for function 'relocate_kernel' [-Wmissing-prototypes]
void *__init relocate_kernel(void)
^
arch/mips/kernel/relocate.c:304:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
void *__init relocate_kernel(void)
^
static
arch/mips/kernel/relocate.c:415:6: warning: no previous prototype for function 'show_kernel_relocation' [-Wmissing-prototypes]
void show_kernel_relocation(const char *level)
^
arch/mips/kernel/relocate.c:415:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
void show_kernel_relocation(const char *level)
^
static
16 warnings generated.

vim +/plat_post_relocation +41 arch/mips/kernel/relocate.c

4c9fff362261d6 Marcin Nowakowski 2016-11-23 35
8cc709d7d4f013 Steven J. Hill 2016-12-09 36 /*
8cc709d7d4f013 Steven J. Hill 2016-12-09 37 * This function may be defined for a platform to perform any post-relocation
8cc709d7d4f013 Steven J. Hill 2016-12-09 38 * fixup necessary.
8cc709d7d4f013 Steven J. Hill 2016-12-09 39 * Return non-zero to abort relocation
8cc709d7d4f013 Steven J. Hill 2016-12-09 40 */
8cc709d7d4f013 Steven J. Hill 2016-12-09 @41 int __weak plat_post_relocation(long offset)
8cc709d7d4f013 Steven J. Hill 2016-12-09 42 {
8cc709d7d4f013 Steven J. Hill 2016-12-09 43 return 0;
8cc709d7d4f013 Steven J. Hill 2016-12-09 44 }
8cc709d7d4f013 Steven J. Hill 2016-12-09 45

:::::: The code at line 41 was first introduced by commit
:::::: 8cc709d7d4f013f51d38ceb2e3c8c82d230cf457 MIPS: Relocatable: Provide plat_post_relocation hook

:::::: TO: Steven J. Hill <Steven.Hill@xxxxxxxxxx>
:::::: CC: Ralf Baechle <ralf@xxxxxxxxxxxxxx>

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

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