[ammarfaizi2-block:crng/random/jd/vdso 9/9] drivers/char/random.c:88:42: error: type specifier missing, defaults to 'int'; ISO C99 and later do not support implicit int

kernel test robot
2022-08-01T18:48:55Z

tree: https://github.com/ammarfaizi2/linux-block crng/random/jd/vdso
head: 352e85344386bb54dc19717319667b114cff5082
commit: 352e85344386bb54dc19717319667b114cff5082 [9/9] random: implement getrandom() in vDSO
config: s390-randconfig-r004-20220801 (https://download.01.org/0day-ci/archive/20220802/202208020202.PoWcpRyd-lkp@intel.com/config)
compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 52cd00cabf479aa7eb6dbb063b7ba41ea57bce9e)
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 s390 cross compiling tool for clang build
# apt-get install binutils-s390x-linux-gnu
# https://github.com/ammarfaizi2/linux-block/commit/352e85344386bb54dc19717319667b114cff5082
git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
git fetch --no-tags ammarfaizi2-block crng/random/jd/vdso
git checkout 352e85344386bb54dc19717319667b114cff5082
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=s390 SHELL=/bin/bash drivers/char/

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

All errors (new ones prefixed by >>):

In file included from drivers/char/random.c:48:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:13:
In file included from arch/s390/include/asm/io.h:75:
include/asm-generic/io.h:464:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
val = __raw_readb(PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:477:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr));
~~~~~~~~~~ ^
include/uapi/linux/byteorder/big_endian.h:37:59: note: expanded from macro '__le16_to_cpu'
#define __le16_to_cpu(x) __swab16((__force __u16)(__le16)(x))
^
include/uapi/linux/swab.h:102:54: note: expanded from macro '__swab16'
#define __swab16(x) (__u16)__builtin_bswap16((__u16)(x))
^
In file included from drivers/char/random.c:48:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:13:
In file included from arch/s390/include/asm/io.h:75:
include/asm-generic/io.h:490:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
~~~~~~~~~~ ^
include/uapi/linux/byteorder/big_endian.h:35:59: note: expanded from macro '__le32_to_cpu'
#define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x))
^
include/uapi/linux/swab.h:115:54: note: expanded from macro '__swab32'
#define __swab32(x) (__u32)__builtin_bswap32((__u32)(x))
^
In file included from drivers/char/random.c:48:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:13:
In file included from arch/s390/include/asm/io.h:75:
include/asm-generic/io.h:501:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writeb(value, PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:511:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:521:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:609:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
readsb(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:617:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
readsw(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:625:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
readsl(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:634:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
writesb(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:643:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
writesw(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:652:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
writesl(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
>> drivers/char/random.c:88:42: error: type specifier missing, defaults to 'int'; ISO C99 and later do not support implicit int [-Wimplicit-int]
DEFINE_VVAR_SINGLE(struct vdso_rng_data, _vdso_rng_data);
^
int
drivers/char/random.c:88:1: error: type specifier missing, defaults to 'int'; ISO C99 and later do not support implicit int [-Wimplicit-int]
DEFINE_VVAR_SINGLE(struct vdso_rng_data, _vdso_rng_data);
^
int
12 warnings and 2 errors generated.

vim +/int +88 drivers/char/random.c

63
64 /*********************************************************************
65 *
66 * Initialization and readiness waiting.
67 *
68 * Much of the RNG infrastructure is devoted to various dependencies
69 * being able to wait until the RNG has collected enough entropy and
70 * is ready for safe consumption.
71 *
72 *********************************************************************/
73
74 /*
75 * crng_init is protected by base_crng->lock, and only increases
76 * its value (from empty->early->ready).
77 */
78 static enum {
79 CRNG_EMPTY = 0, /* Little to no entropy collected */
80 CRNG_EARLY = 1, /* At least POOL_EARLY_BITS collected */
81 CRNG_READY = 2 /* Fully initialized with POOL_READY_BITS collected */
82 } crng_init __read_mostly = CRNG_EMPTY;
83 static DEFINE_STATIC_KEY_FALSE(crng_is_ready);
84 #define crng_ready() (static_branch_likely(&crng_is_ready) || crng_init >= CRNG_READY)
85 /* Various types of waiters for crng_init->CRNG_READY transition. */
86 static DECLARE_WAIT_QUEUE_HEAD(crng_init_wait);
87 static struct fasync_struct *fasync;
> 88 DEFINE_VVAR_SINGLE(struct vdso_rng_data, _vdso_rng_data);
89

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