[intel-tdx:tdx/guest-rebased 118/133] kernel/dma/swiotlb.c:388:15: warning: cast to 'struct io_tlb_area *' from smaller integer type 'int'
From: kernel test robot
Date: Thu Jan 13 2022 - 16:33:07 EST
tree: https://github.com/intel/tdx.git tdx/guest-rebased
head: e3995864d37c56f431c93fc3dc454d9c65f5e9ea
commit: 8c696e48187c5ffa881e639e1108622debbe6741 [118/133] swiotlb: Split up single swiotlb lock
config: s390-randconfig-r033-20220113 (https://download.01.org/0day-ci/archive/20220114/202201140505.rrWmRq01-lkp@xxxxxxxxx/config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project d1021978b8e7e35dcc30201ca1731d64b5a602a8)
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/intel/tdx/commit/8c696e48187c5ffa881e639e1108622debbe6741
git remote add intel-tdx https://github.com/intel/tdx.git
git fetch --no-tags intel-tdx tdx/guest-rebased
git checkout 8c696e48187c5ffa881e639e1108622debbe6741
# 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=s390 SHELL=/bin/bash kernel/dma/
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 kernel/dma/swiotlb.c:24:
In file included from include/linux/dma-direct.h:9:
In file included from include/linux/dma-mapping.h:10:
In file included from include/linux/scatterlist.h:9:
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:36:59: 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 kernel/dma/swiotlb.c:24:
In file included from include/linux/dma-direct.h:9:
In file included from include/linux/dma-mapping.h:10:
In file included from include/linux/scatterlist.h:9:
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:34:59: 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 kernel/dma/swiotlb.c:24:
In file included from include/linux/dma-direct.h:9:
In file included from include/linux/dma-mapping.h:10:
In file included from include/linux/scatterlist.h:9:
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);
~~~~~~~~~~ ^
kernel/dma/swiotlb.c:379:16: error: implicit declaration of function 'kzalloc' [-Werror,-Wimplicit-function-declaration]
mem->bitmap = kzalloc(DIV_ROUND_UP(nslabs, BITS_PER_BYTE), GFP_KERNEL);
^
kernel/dma/swiotlb.c:379:16: note: did you mean 'vzalloc'?
include/linux/vmalloc.h:140:14: note: 'vzalloc' declared here
extern void *vzalloc(unsigned long size) __alloc_size(1);
^
kernel/dma/swiotlb.c:379:14: warning: incompatible integer to pointer conversion assigning to 'unsigned long *' from 'int' [-Wint-conversion]
mem->bitmap = kzalloc(DIV_ROUND_UP(nslabs, BITS_PER_BYTE), GFP_KERNEL);
^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
kernel/dma/swiotlb.c:383:3: error: implicit declaration of function 'kfree' [-Werror,-Wimplicit-function-declaration]
kfree(mem->bitmap);
^
kernel/dma/swiotlb.c:383:3: note: did you mean 'vfree'?
include/linux/vmalloc.h:155:13: note: 'vfree' declared here
extern void vfree(const void *addr);
^
kernel/dma/swiotlb.c:388:37: error: implicit declaration of function 'kcalloc' [-Werror,-Wimplicit-function-declaration]
mem->areas = (struct io_tlb_area *)kcalloc(num_areas,
^
kernel/dma/swiotlb.c:388:37: note: did you mean 'kzalloc'?
kernel/dma/swiotlb.c:379:16: note: 'kzalloc' declared here
mem->bitmap = kzalloc(DIV_ROUND_UP(nslabs, BITS_PER_BYTE), GFP_KERNEL);
^
>> kernel/dma/swiotlb.c:388:15: warning: cast to 'struct io_tlb_area *' from smaller integer type 'int' [-Wint-to-pointer-cast]
mem->areas = (struct io_tlb_area *)kcalloc(num_areas,
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
kernel/dma/swiotlb.c:420:3: error: implicit declaration of function 'kfree' [-Werror,-Wimplicit-function-declaration]
kfree(mem->areas);
^
14 warnings and 4 errors generated.
vim +388 kernel/dma/swiotlb.c
364
365 int
366 swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs)
367 {
368 struct io_tlb_mem *mem = &io_tlb_default_mem;
369 unsigned long bytes = nslabs << IO_TLB_SHIFT;
370 int order;
371
372 if (swiotlb_force == SWIOTLB_NO_FORCE)
373 return 0;
374
375 /* protect against double initialization */
376 if (WARN_ON_ONCE(mem->nslabs))
377 return -ENOMEM;
378
379 mem->bitmap = kzalloc(DIV_ROUND_UP(nslabs, BITS_PER_BYTE), GFP_KERNEL);
380 order = get_order(array_size(sizeof(*mem->slots), nslabs));
381 mem->slots = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
382 if (!mem->slots || !mem->bitmap) {
383 kfree(mem->bitmap);
384 kfree(mem->slots);
385 return -ENOMEM;
386 }
387
> 388 mem->areas = (struct io_tlb_area *)kcalloc(num_areas,
389 sizeof(struct io_tlb_area),
390 GFP_KERNEL);
391 if (!mem->areas) {
392 free_pages((unsigned long)mem->slots, order);
393 return -ENOMEM;
394 }
395
396 set_memory_decrypted((unsigned long)tlb, bytes >> PAGE_SHIFT);
397 swiotlb_init_io_tlb_mem(mem, virt_to_phys(tlb), nslabs, true);
398
399 swiotlb_print_info();
400 swiotlb_set_max_segment(mem->nslabs << IO_TLB_SHIFT);
401 return 0;
402 }
403
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx