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2d1e54aab6
Concurrent reads and writes of sysctl_max_map_count are possible, so we should READ_ONCE() and WRITE_ONCE(). The sysctl procfs logic already enforces WRITE_ONCE(), so abstract the read side with get_sysctl_max_map_count(). While we're here, also move the field to mm/internal.h and add the getter there since only mm interacts with it, there's no need for anybody else to have access. Finally, update the VMA userland tests to reflect the change. Link: https://lkml.kernel.org/r/0715259eb37cbdfde4f9e5db92a20ec7110a1ce5.1773249037.git.ljs@kernel.org Signed-off-by: Lorenzo Stoakes (Oracle) <ljs@kernel.org> Reviewed-by: Pedro Falcato <pfalcato@suse.de> Cc: Jann Horn <jannh@google.com> Cc: Jianzhou Zhao <luckd0g@163.com> Cc: Liam Howlett <liam.howlett@oracle.com> Cc: Michal Hocko <mhocko@suse.com> Cc: Mike Rapoport <rppt@kernel.org> Cc: Oscar Salvador <osalvador@suse.de> Cc: Suren Baghdasaryan <surenb@google.com> Cc: Vlastimil Babka <vbabka@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
58 lines
1.3 KiB
C
58 lines
1.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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#include "shared.h"
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/*
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* Directly import the VMA implementation here. Our vma_internal.h wrapper
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* provides userland-equivalent functionality for everything vma.c uses.
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*/
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#include "../../../mm/vma_init.c"
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#include "../../../mm/vma_exec.c"
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#include "../../../mm/vma.c"
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/* Tests are included directly so they can test static functions in mm/vma.c. */
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#include "tests/merge.c"
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#include "tests/mmap.c"
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#include "tests/vma.c"
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int sysctl_max_map_count __read_mostly = DEFAULT_MAX_MAP_COUNT;
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/* Helper functions which utilise static kernel functions. */
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struct vm_area_struct *merge_existing(struct vma_merge_struct *vmg)
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{
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struct vm_area_struct *vma;
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vma = vma_merge_existing_range(vmg);
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if (vma)
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vma_assert_attached(vma);
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return vma;
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}
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int attach_vma(struct mm_struct *mm, struct vm_area_struct *vma)
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{
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int res;
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res = vma_link(mm, vma);
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if (!res)
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vma_assert_attached(vma);
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return res;
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}
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/* Main test running which invokes tests/ *.c runners. */
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int main(void)
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{
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int num_tests = 0, num_fail = 0;
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maple_tree_init();
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vma_state_init();
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run_merge_tests(&num_tests, &num_fail);
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run_mmap_tests(&num_tests, &num_fail);
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run_vma_tests(&num_tests, &num_fail);
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printf("%d tests run, %d passed, %d failed.\n",
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num_tests, num_tests - num_fail, num_fail);
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return num_fail == 0 ? EXIT_SUCCESS : EXIT_FAILURE;
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}
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