mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
synced 2025-08-28 00:19:36 +00:00
792b429db7
Especially once we hit one of the assertions in sanity_check_pinned_pages(), observing follow-up assertions failing in other code can give good clues about what went wrong, so use VM_WARN_ON_ONCE instead. While at it, let's just convert all VM_BUG_ON to VM_WARN_ON_ONCE as well. Add one comment for the pfn_valid() check. We have to introduce VM_WARN_ON_ONCE_VMA() to make that fly. Drop the BUG_ON after mmap_read_lock_killable(), if that ever returns something > 0 we're in bigger trouble. Convert the other BUG_ON's into VM_WARN_ON_ONCE as well, they are in a similar domain "should never happen", but more reasonable to check for during early testing. [david@redhat.com: use the _FOLIO variant where possible, per Lorenzo] Link: https://lkml.kernel.org/r/844bd929-a551-48e3-a12e-285cd65ba580@redhat.com Link: https://lkml.kernel.org/r/20250604140544.688711-1-david@redhat.com Signed-off-by: David Hildenbrand <david@redhat.com> Acked-by: Vlastimil Babka <vbabka@suse.cz> Reviewed-by: Suren Baghdasaryan <surenb@google.com> Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com> Acked-by: SeongJae Park <sj@kernel.org> Reviewed-by: Liam R. Howlett <Liam.Howlett@oracle.com> Acked-by: Michal Hocko <mhocko@suse.com> Reviewed-by: John Hubbard <jhubbard@nvidia.com> Cc: Mike Rapoport <rppt@kernel.org> Cc: Jason Gunthorpe <jgg@ziepe.ca> Cc: Peter Xu <peterx@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
154 lines
4.7 KiB
C
154 lines
4.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef LINUX_MM_DEBUG_H
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#define LINUX_MM_DEBUG_H 1
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#include <linux/bug.h>
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#include <linux/stringify.h>
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struct page;
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struct vm_area_struct;
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struct mm_struct;
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struct vma_iterator;
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struct vma_merge_struct;
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void dump_page(const struct page *page, const char *reason);
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void dump_vma(const struct vm_area_struct *vma);
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void dump_mm(const struct mm_struct *mm);
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void dump_vmg(const struct vma_merge_struct *vmg, const char *reason);
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void vma_iter_dump_tree(const struct vma_iterator *vmi);
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#ifdef CONFIG_DEBUG_VM
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#define VM_BUG_ON(cond) BUG_ON(cond)
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#define VM_BUG_ON_PAGE(cond, page) \
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do { \
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if (unlikely(cond)) { \
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dump_page(page, "VM_BUG_ON_PAGE(" __stringify(cond)")");\
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BUG(); \
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} \
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} while (0)
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#define VM_BUG_ON_FOLIO(cond, folio) \
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do { \
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if (unlikely(cond)) { \
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dump_page(&folio->page, "VM_BUG_ON_FOLIO(" __stringify(cond)")");\
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BUG(); \
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} \
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} while (0)
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#define VM_BUG_ON_VMA(cond, vma) \
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do { \
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if (unlikely(cond)) { \
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dump_vma(vma); \
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BUG(); \
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} \
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} while (0)
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#define VM_BUG_ON_MM(cond, mm) \
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do { \
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if (unlikely(cond)) { \
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dump_mm(mm); \
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BUG(); \
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} \
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} while (0)
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#define VM_WARN_ON_ONCE_PAGE(cond, page) ({ \
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static bool __section(".data..once") __warned; \
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int __ret_warn_once = !!(cond); \
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\
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if (unlikely(__ret_warn_once && !__warned)) { \
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dump_page(page, "VM_WARN_ON_ONCE_PAGE(" __stringify(cond)")");\
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__warned = true; \
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WARN_ON(1); \
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} \
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unlikely(__ret_warn_once); \
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})
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#define VM_WARN_ON_FOLIO(cond, folio) ({ \
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int __ret_warn = !!(cond); \
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\
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if (unlikely(__ret_warn)) { \
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dump_page(&folio->page, "VM_WARN_ON_FOLIO(" __stringify(cond)")");\
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WARN_ON(1); \
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} \
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unlikely(__ret_warn); \
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})
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#define VM_WARN_ON_ONCE_FOLIO(cond, folio) ({ \
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static bool __section(".data..once") __warned; \
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int __ret_warn_once = !!(cond); \
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\
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if (unlikely(__ret_warn_once && !__warned)) { \
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dump_page(&folio->page, "VM_WARN_ON_ONCE_FOLIO(" __stringify(cond)")");\
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__warned = true; \
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WARN_ON(1); \
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} \
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unlikely(__ret_warn_once); \
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})
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#define VM_WARN_ON_ONCE_MM(cond, mm) ({ \
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static bool __section(".data..once") __warned; \
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int __ret_warn_once = !!(cond); \
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\
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if (unlikely(__ret_warn_once && !__warned)) { \
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dump_mm(mm); \
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__warned = true; \
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WARN_ON(1); \
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} \
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unlikely(__ret_warn_once); \
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})
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#define VM_WARN_ON_ONCE_VMA(cond, vma) ({ \
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static bool __section(".data..once") __warned; \
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int __ret_warn_once = !!(cond); \
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\
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if (unlikely(__ret_warn_once && !__warned)) { \
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dump_vma(vma); \
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__warned = true; \
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WARN_ON(1); \
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} \
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unlikely(__ret_warn_once); \
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})
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#define VM_WARN_ON_VMG(cond, vmg) ({ \
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int __ret_warn = !!(cond); \
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\
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if (unlikely(__ret_warn)) { \
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dump_vmg(vmg, "VM_WARN_ON_VMG(" __stringify(cond)")"); \
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WARN_ON(1); \
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} \
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unlikely(__ret_warn); \
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})
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#define VM_WARN_ON(cond) (void)WARN_ON(cond)
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#define VM_WARN_ON_ONCE(cond) (void)WARN_ON_ONCE(cond)
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#define VM_WARN_ONCE(cond, format...) (void)WARN_ONCE(cond, format)
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#define VM_WARN(cond, format...) (void)WARN(cond, format)
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#else
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#define VM_BUG_ON(cond) BUILD_BUG_ON_INVALID(cond)
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#define VM_BUG_ON_PAGE(cond, page) VM_BUG_ON(cond)
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#define VM_BUG_ON_FOLIO(cond, folio) VM_BUG_ON(cond)
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#define VM_BUG_ON_VMA(cond, vma) VM_BUG_ON(cond)
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#define VM_BUG_ON_MM(cond, mm) VM_BUG_ON(cond)
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#define VM_WARN_ON(cond) BUILD_BUG_ON_INVALID(cond)
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#define VM_WARN_ON_ONCE(cond) BUILD_BUG_ON_INVALID(cond)
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#define VM_WARN_ON_ONCE_PAGE(cond, page) BUILD_BUG_ON_INVALID(cond)
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#define VM_WARN_ON_FOLIO(cond, folio) BUILD_BUG_ON_INVALID(cond)
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#define VM_WARN_ON_ONCE_FOLIO(cond, folio) BUILD_BUG_ON_INVALID(cond)
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#define VM_WARN_ON_ONCE_MM(cond, mm) BUILD_BUG_ON_INVALID(cond)
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#define VM_WARN_ON_ONCE_VMA(cond, vma) BUILD_BUG_ON_INVALID(cond)
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#define VM_WARN_ON_VMG(cond, vmg) BUILD_BUG_ON_INVALID(cond)
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#define VM_WARN_ONCE(cond, format...) BUILD_BUG_ON_INVALID(cond)
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#define VM_WARN(cond, format...) BUILD_BUG_ON_INVALID(cond)
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#endif /* CONFIG_DEBUG_VM */
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#ifdef CONFIG_DEBUG_VM_IRQSOFF
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#define VM_WARN_ON_IRQS_ENABLED() WARN_ON_ONCE(!irqs_disabled())
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#else
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#define VM_WARN_ON_IRQS_ENABLED() do { } while (0)
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#endif
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#ifdef CONFIG_DEBUG_VIRTUAL
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#define VIRTUAL_BUG_ON(cond) BUG_ON(cond)
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#else
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#define VIRTUAL_BUG_ON(cond) do { } while (0)
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#endif
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#ifdef CONFIG_DEBUG_VM_PGFLAGS
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#define VM_BUG_ON_PGFLAGS(cond, page) VM_BUG_ON_PAGE(cond, page)
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#else
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#define VM_BUG_ON_PGFLAGS(cond, page) BUILD_BUG_ON_INVALID(cond)
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#endif
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#endif
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