From: kernel test robot <lkp@intel.com>
To: Kees Cook <kees@kernel.org>
Cc: llvm@lists.linux.dev, oe-kbuild-all@lists.linux.dev
Subject: [kees:dev/v6.15-rc3+/cb-ptr 3/3] kernel/dma/swiotlb.c:639:20: warning: shift count >= width of type
Date: Wed, 7 May 2025 13:49:27 +0800 [thread overview]
Message-ID: <202505071332.v3AUBVsw-lkp@intel.com> (raw)
tree: https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git dev/v6.15-rc3+/cb-ptr
head: 342a3b133d248d5a5f71587958eb26bea9901814
commit: 342a3b133d248d5a5f71587958eb26bea9901814 [3/3] [WIP] iov annotation
config: s390-randconfig-002-20250502 (https://download.01.org/0day-ci/archive/20250507/202505071332.v3AUBVsw-lkp@intel.com/config)
compiler: clang version 21.0.0git (https://github.com/llvm/llvm-project f819f46284f2a79790038e1f6649172789734ae8)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250507/202505071332.v3AUBVsw-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202505071332.v3AUBVsw-lkp@intel.com/
All warnings (new ones prefixed by >>):
In file included from include/linux/elf.h:6:
In file included from arch/s390/include/asm/elf.h:165:
include/linux/compat.h:454:10: warning: array index 7 is past the end of the array (that has type 'compat_sigset_word[2]' (aka 'unsigned int[2]')) [-Warray-bounds]
454 | case 4: v.sig[7] = (set->sig[3] >> 32); v.sig[6] = set->sig[3];
| ^ ~
include/linux/compat.h:130:2: note: array 'sig' declared here
130 | compat_sigset_word sig[_COMPAT_NSIG_WORDS];
| ^
include/linux/compat.h:454:42: warning: array index 6 is past the end of the array (that has type 'compat_sigset_word[2]' (aka 'unsigned int[2]')) [-Warray-bounds]
454 | case 4: v.sig[7] = (set->sig[3] >> 32); v.sig[6] = set->sig[3];
| ^ ~
include/linux/compat.h:130:2: note: array 'sig' declared here
130 | compat_sigset_word sig[_COMPAT_NSIG_WORDS];
| ^
include/linux/compat.h:454:53: warning: array index 3 is past the end of the array (that has type 'const unsigned long[1]') [-Warray-bounds]
454 | case 4: v.sig[7] = (set->sig[3] >> 32); v.sig[6] = set->sig[3];
| ^ ~
arch/s390/include/asm/signal.h:22:9: note: array 'sig' declared here
22 | unsigned long sig[_NSIG_WORDS];
| ^
In file included from kernel/dma/swiotlb.c:27:
In file included from include/linux/dma-direct.h:9:
In file included from include/linux/dma-mapping.h:5:
In file included from include/linux/device.h:32:
In file included from include/linux/device/driver.h:21:
In file included from include/linux/module.h:19:
In file included from include/linux/elf.h:6:
In file included from arch/s390/include/asm/elf.h:165:
include/linux/compat.h:456:22: warning: array index 2 is past the end of the array (that has type 'const unsigned long[1]') [-Warray-bounds]
456 | case 3: v.sig[5] = (set->sig[2] >> 32); v.sig[4] = set->sig[2];
| ^ ~
arch/s390/include/asm/signal.h:22:9: note: array 'sig' declared here
22 | unsigned long sig[_NSIG_WORDS];
| ^
In file included from kernel/dma/swiotlb.c:27:
In file included from include/linux/dma-direct.h:9:
In file included from include/linux/dma-mapping.h:5:
In file included from include/linux/device.h:32:
In file included from include/linux/device/driver.h:21:
In file included from include/linux/module.h:19:
In file included from include/linux/elf.h:6:
In file included from arch/s390/include/asm/elf.h:165:
include/linux/compat.h:456:10: warning: array index 5 is past the end of the array (that has type 'compat_sigset_word[2]' (aka 'unsigned int[2]')) [-Warray-bounds]
456 | case 3: v.sig[5] = (set->sig[2] >> 32); v.sig[4] = set->sig[2];
| ^ ~
include/linux/compat.h:130:2: note: array 'sig' declared here
130 | compat_sigset_word sig[_COMPAT_NSIG_WORDS];
| ^
include/linux/compat.h:456:42: warning: array index 4 is past the end of the array (that has type 'compat_sigset_word[2]' (aka 'unsigned int[2]')) [-Warray-bounds]
456 | case 3: v.sig[5] = (set->sig[2] >> 32); v.sig[4] = set->sig[2];
| ^ ~
include/linux/compat.h:130:2: note: array 'sig' declared here
130 | compat_sigset_word sig[_COMPAT_NSIG_WORDS];
| ^
include/linux/compat.h:456:53: warning: array index 2 is past the end of the array (that has type 'const unsigned long[1]') [-Warray-bounds]
456 | case 3: v.sig[5] = (set->sig[2] >> 32); v.sig[4] = set->sig[2];
| ^ ~
arch/s390/include/asm/signal.h:22:9: note: array 'sig' declared here
22 | unsigned long sig[_NSIG_WORDS];
| ^
In file included from kernel/dma/swiotlb.c:27:
In file included from include/linux/dma-direct.h:9:
In file included from include/linux/dma-mapping.h:5:
In file included from include/linux/device.h:32:
In file included from include/linux/device/driver.h:21:
In file included from include/linux/module.h:19:
In file included from include/linux/elf.h:6:
In file included from arch/s390/include/asm/elf.h:165:
include/linux/compat.h:458:22: warning: array index 1 is past the end of the array (that has type 'const unsigned long[1]') [-Warray-bounds]
458 | case 2: v.sig[3] = (set->sig[1] >> 32); v.sig[2] = set->sig[1];
| ^ ~
arch/s390/include/asm/signal.h:22:9: note: array 'sig' declared here
22 | unsigned long sig[_NSIG_WORDS];
| ^
In file included from kernel/dma/swiotlb.c:27:
In file included from include/linux/dma-direct.h:9:
In file included from include/linux/dma-mapping.h:5:
In file included from include/linux/device.h:32:
In file included from include/linux/device/driver.h:21:
In file included from include/linux/module.h:19:
In file included from include/linux/elf.h:6:
In file included from arch/s390/include/asm/elf.h:165:
include/linux/compat.h:458:10: warning: array index 3 is past the end of the array (that has type 'compat_sigset_word[2]' (aka 'unsigned int[2]')) [-Warray-bounds]
458 | case 2: v.sig[3] = (set->sig[1] >> 32); v.sig[2] = set->sig[1];
| ^ ~
include/linux/compat.h:130:2: note: array 'sig' declared here
130 | compat_sigset_word sig[_COMPAT_NSIG_WORDS];
| ^
include/linux/compat.h:458:42: warning: array index 2 is past the end of the array (that has type 'compat_sigset_word[2]' (aka 'unsigned int[2]')) [-Warray-bounds]
458 | case 2: v.sig[3] = (set->sig[1] >> 32); v.sig[2] = set->sig[1];
| ^ ~
include/linux/compat.h:130:2: note: array 'sig' declared here
130 | compat_sigset_word sig[_COMPAT_NSIG_WORDS];
| ^
include/linux/compat.h:458:53: warning: array index 1 is past the end of the array (that has type 'const unsigned long[1]') [-Warray-bounds]
458 | case 2: v.sig[3] = (set->sig[1] >> 32); v.sig[2] = set->sig[1];
| ^ ~
arch/s390/include/asm/signal.h:22:9: note: array 'sig' declared here
22 | unsigned long sig[_NSIG_WORDS];
| ^
>> kernel/dma/swiotlb.c:639:20: warning: shift count >= width of type [-Wshift-count-overflow]
638 | if (IS_ENABLED(CONFIG_ZONE_DMA32) &&
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
639 | phys_limit < DMA_BIT_MASK(64) &&
| ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~
640 | !(gfp & (__GFP_DMA32 | __GFP_DMA)))
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/dma-mapping.h:73:54: note: expanded from macro 'DMA_BIT_MASK'
73 | #define DMA_BIT_MASK(n) (((n) == 64) ? ~0ULL : ((1ULL<<(n))-1))
| ^
include/linux/compiler.h:55:47: note: expanded from macro 'if'
55 | #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) )
| ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
include/linux/compiler.h:57:52: note: expanded from macro '__trace_if_var'
57 | #define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond))
| ^~~~
>> kernel/dma/swiotlb.c:639:20: warning: shift count >= width of type [-Wshift-count-overflow]
638 | if (IS_ENABLED(CONFIG_ZONE_DMA32) &&
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
639 | phys_limit < DMA_BIT_MASK(64) &&
| ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~
640 | !(gfp & (__GFP_DMA32 | __GFP_DMA)))
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/dma-mapping.h:73:54: note: expanded from macro 'DMA_BIT_MASK'
73 | #define DMA_BIT_MASK(n) (((n) == 64) ? ~0ULL : ((1ULL<<(n))-1))
| ^
include/linux/compiler.h:55:47: note: expanded from macro 'if'
55 | #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) )
| ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
include/linux/compiler.h:57:61: note: expanded from macro '__trace_if_var'
57 | #define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond))
| ^~~~
>> kernel/dma/swiotlb.c:639:20: warning: shift count >= width of type [-Wshift-count-overflow]
638 | if (IS_ENABLED(CONFIG_ZONE_DMA32) &&
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
639 | phys_limit < DMA_BIT_MASK(64) &&
| ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~
640 | !(gfp & (__GFP_DMA32 | __GFP_DMA)))
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/dma-mapping.h:73:54: note: expanded from macro 'DMA_BIT_MASK'
73 | #define DMA_BIT_MASK(n) (((n) == 64) ? ~0ULL : ((1ULL<<(n))-1))
| ^
include/linux/compiler.h:55:47: note: expanded from macro 'if'
55 | #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) )
| ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
include/linux/compiler.h:57:86: note: expanded from macro '__trace_if_var'
57 | #define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond))
| ~~~~~~~~~~~~~~~~~^~~~~
include/linux/compiler.h:68:3: note: expanded from macro '__trace_if_value'
68 | (cond) ? \
| ^~~~
15 warnings and 2 errors generated.
vim +639 kernel/dma/swiotlb.c
79636caad3618e Petr Tesarik 2023-08-01 602
79636caad3618e Petr Tesarik 2023-08-01 603 /**
79636caad3618e Petr Tesarik 2023-08-01 604 * swiotlb_alloc_tlb() - allocate a dynamic IO TLB buffer
79636caad3618e Petr Tesarik 2023-08-01 605 * @dev: Device for which a memory pool is allocated.
79636caad3618e Petr Tesarik 2023-08-01 606 * @bytes: Size of the buffer.
79636caad3618e Petr Tesarik 2023-08-01 607 * @phys_limit: Maximum allowed physical address of the buffer.
79636caad3618e Petr Tesarik 2023-08-01 608 * @gfp: GFP flags for the allocation.
79636caad3618e Petr Tesarik 2023-08-01 609 *
79636caad3618e Petr Tesarik 2023-08-01 610 * Return: Allocated pages, or %NULL on allocation failure.
79636caad3618e Petr Tesarik 2023-08-01 611 */
79636caad3618e Petr Tesarik 2023-08-01 612 static struct page *swiotlb_alloc_tlb(struct device *dev, size_t bytes,
79636caad3618e Petr Tesarik 2023-08-01 613 u64 phys_limit, gfp_t gfp)
79636caad3618e Petr Tesarik 2023-08-01 614 {
79636caad3618e Petr Tesarik 2023-08-01 615 struct page *page;
79636caad3618e Petr Tesarik 2023-08-01 616
79636caad3618e Petr Tesarik 2023-08-01 617 /*
79636caad3618e Petr Tesarik 2023-08-01 618 * Allocate from the atomic pools if memory is encrypted and
79636caad3618e Petr Tesarik 2023-08-01 619 * the allocation is atomic, because decrypting may block.
79636caad3618e Petr Tesarik 2023-08-01 620 */
79636caad3618e Petr Tesarik 2023-08-01 621 if (!gfpflags_allow_blocking(gfp) && dev && force_dma_unencrypted(dev)) {
79636caad3618e Petr Tesarik 2023-08-01 622 void *vaddr;
79636caad3618e Petr Tesarik 2023-08-01 623
79636caad3618e Petr Tesarik 2023-08-01 624 if (!IS_ENABLED(CONFIG_DMA_COHERENT_POOL))
79636caad3618e Petr Tesarik 2023-08-01 625 return NULL;
79636caad3618e Petr Tesarik 2023-08-01 626
79636caad3618e Petr Tesarik 2023-08-01 627 return dma_alloc_from_pool(dev, bytes, &vaddr, gfp,
79636caad3618e Petr Tesarik 2023-08-01 628 dma_coherent_ok);
79636caad3618e Petr Tesarik 2023-08-01 629 }
79636caad3618e Petr Tesarik 2023-08-01 630
79636caad3618e Petr Tesarik 2023-08-01 631 gfp &= ~GFP_ZONEMASK;
ba0fb44aed4769 Catalin Marinas 2024-08-11 632 if (phys_limit <= zone_dma_limit)
79636caad3618e Petr Tesarik 2023-08-01 633 gfp |= __GFP_DMA;
79636caad3618e Petr Tesarik 2023-08-01 634 else if (phys_limit <= DMA_BIT_MASK(32))
79636caad3618e Petr Tesarik 2023-08-01 635 gfp |= __GFP_DMA32;
79636caad3618e Petr Tesarik 2023-08-01 636
a5e3b127455d07 Petr Tesarik 2023-11-02 637 while (IS_ERR(page = alloc_dma_pages(gfp, bytes, phys_limit))) {
79636caad3618e Petr Tesarik 2023-08-01 638 if (IS_ENABLED(CONFIG_ZONE_DMA32) &&
79636caad3618e Petr Tesarik 2023-08-01 @639 phys_limit < DMA_BIT_MASK(64) &&
79636caad3618e Petr Tesarik 2023-08-01 640 !(gfp & (__GFP_DMA32 | __GFP_DMA)))
79636caad3618e Petr Tesarik 2023-08-01 641 gfp |= __GFP_DMA32;
79636caad3618e Petr Tesarik 2023-08-01 642 else if (IS_ENABLED(CONFIG_ZONE_DMA) &&
79636caad3618e Petr Tesarik 2023-08-01 643 !(gfp & __GFP_DMA))
79636caad3618e Petr Tesarik 2023-08-01 644 gfp = (gfp & ~__GFP_DMA32) | __GFP_DMA;
79636caad3618e Petr Tesarik 2023-08-01 645 else
79636caad3618e Petr Tesarik 2023-08-01 646 return NULL;
79636caad3618e Petr Tesarik 2023-08-01 647 }
79636caad3618e Petr Tesarik 2023-08-01 648
79636caad3618e Petr Tesarik 2023-08-01 649 return page;
79636caad3618e Petr Tesarik 2023-08-01 650 }
79636caad3618e Petr Tesarik 2023-08-01 651
:::::: The code at line 639 was first introduced by commit
:::::: 79636caad3618e2b38457f6e298c9b31ba82b489 swiotlb: if swiotlb is full, fall back to a transient memory pool
:::::: TO: Petr Tesarik <petr.tesarik.ext@huawei.com>
:::::: CC: Christoph Hellwig <hch@lst.de>
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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