tree: https://git.kernel.org/pub/scm/linux/kernel/git/mhocko/mm.git since-4.16 head: e5edc6faef45baae632fc4c76096a2ab69145c11 commit: a18ed29e39bde6c1aaf0fb449732ba8423bc5964 [207/224] exec: pass stack rlimit into mm layout functions config: tile-tilegx_defconfig (attached as .config) compiler: tilegx-linux-gcc (GCC) 7.2.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout a18ed29e39bde6c1aaf0fb449732ba8423bc5964 # save the attached .config to linux build tree make.cross ARCH=tile All errors (new ones prefixed by >>): >> arch/tile/mm/mmap.c:53:6: error: conflicting types for 'arch_pick_mmap_layout' void arch_pick_mmap_layout(struct mm_struct *mm) ^~~~~~~~~~~~~~~~~~~~~ In file included from include/linux/slab.h:18:0, from arch/tile/include/asm/pgtable.h:27, from include/linux/memremap.h:8, from include/linux/mm.h:27, from arch/tile/mm/mmap.c:17: include/linux/sched/mm.h:107:13: note: previous declaration of 'arch_pick_mmap_layout' was here extern void arch_pick_mmap_layout(struct mm_struct *mm, ^~~~~~~~~~~~~~~~~~~~~ vim +/arch_pick_mmap_layout +53 arch/tile/mm/mmap.c 867e359b Chris Metcalf 2010-05-28 48 867e359b Chris Metcalf 2010-05-28 49 /* 867e359b Chris Metcalf 2010-05-28 50 * This function, called very early during the creation of a new 867e359b Chris Metcalf 2010-05-28 51 * process VM image, sets up which VM layout function to use: 867e359b Chris Metcalf 2010-05-28 52 */ 867e359b Chris Metcalf 2010-05-28 @53 void arch_pick_mmap_layout(struct mm_struct *mm) 867e359b Chris Metcalf 2010-05-28 54 { 867e359b Chris Metcalf 2010-05-28 55 #if !defined(__tilegx__) 867e359b Chris Metcalf 2010-05-28 56 int is_32bit = 1; 867e359b Chris Metcalf 2010-05-28 57 #elif defined(CONFIG_COMPAT) 867e359b Chris Metcalf 2010-05-28 58 int is_32bit = is_compat_task(); 867e359b Chris Metcalf 2010-05-28 59 #else 867e359b Chris Metcalf 2010-05-28 60 int is_32bit = 0; 867e359b Chris Metcalf 2010-05-28 61 #endif b2eca427 Tony Lu 2013-08-09 62 unsigned long random_factor = 0UL; b2eca427 Tony Lu 2013-08-09 63 b2eca427 Tony Lu 2013-08-09 64 /* b2eca427 Tony Lu 2013-08-09 65 * 8 bits of randomness in 32bit mmaps, 24 address space bits b2eca427 Tony Lu 2013-08-09 66 * 12 bits of randomness in 64bit mmaps, 28 address space bits b2eca427 Tony Lu 2013-08-09 67 */ b2eca427 Tony Lu 2013-08-09 68 if (current->flags & PF_RANDOMIZE) { b2eca427 Tony Lu 2013-08-09 69 if (is_32bit) b2eca427 Tony Lu 2013-08-09 70 random_factor = get_random_int() % (1<<8); b2eca427 Tony Lu 2013-08-09 71 else b2eca427 Tony Lu 2013-08-09 72 random_factor = get_random_int() % (1<<12); b2eca427 Tony Lu 2013-08-09 73 b2eca427 Tony Lu 2013-08-09 74 random_factor <<= PAGE_SHIFT; b2eca427 Tony Lu 2013-08-09 75 } 867e359b Chris Metcalf 2010-05-28 76 867e359b Chris Metcalf 2010-05-28 77 /* 867e359b Chris Metcalf 2010-05-28 78 * Use standard layout if the expected stack growth is unlimited 867e359b Chris Metcalf 2010-05-28 79 * or we are running native 64 bits. 867e359b Chris Metcalf 2010-05-28 80 */ b2eca427 Tony Lu 2013-08-09 81 if (rlimit(RLIMIT_STACK) == RLIM_INFINITY) { b2eca427 Tony Lu 2013-08-09 82 mm->mmap_base = TASK_UNMAPPED_BASE + random_factor; 867e359b Chris Metcalf 2010-05-28 83 mm->get_unmapped_area = arch_get_unmapped_area; 867e359b Chris Metcalf 2010-05-28 84 } else { 867e359b Chris Metcalf 2010-05-28 85 mm->mmap_base = mmap_base(mm); 867e359b Chris Metcalf 2010-05-28 86 mm->get_unmapped_area = arch_get_unmapped_area_topdown; 867e359b Chris Metcalf 2010-05-28 87 } 867e359b Chris Metcalf 2010-05-28 88 } b2eca427 Tony Lu 2013-08-09 89 :::::: The code at line 53 was first introduced by commit :::::: 867e359b97c970a60626d5d76bbe2a8fadbf38fb arch/tile: core support for Tilera 32-bit chips. :::::: TO: Chris Metcalf <cmetcalf@xxxxxxxxxx> :::::: CC: Chris Metcalf <cmetcalf@xxxxxxxxxx> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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