Nathan Chancellor
ced17a55a8
Portions of upstream commita405588862("mm/memcg: warning on !memcg after readahead page charged") were backported as commitcfe575954d("mm: add VM_WARN_ON_ONCE_PAGE() macro"). Unfortunately, the backport did not account for the lack of commit33def8498f("treewide: Convert macro and uses of __section(foo) to __section("foo")") in kernels prior to 5.10, resulting in the following orphan section warnings on PowerPC clang builds with CONFIG_DEBUG_VM=y: powerpc64le-linux-gnu-ld: warning: orphan section `".data.once"' from `mm/huge_memory.o' being placed in section `".data.once"' powerpc64le-linux-gnu-ld: warning: orphan section `".data.once"' from `mm/huge_memory.o' being placed in section `".data.once"' powerpc64le-linux-gnu-ld: warning: orphan section `".data.once"' from `mm/huge_memory.o' being placed in section `".data.once"' This is a difference between how clang and gcc handle macro stringification, which was resolved for the kernel by not stringifying the argument to the __section() macro. Since that change was deemed not suitable for the stable kernels by commit59f89518f5("once: fix section mismatch on clang builds"), do that same thing as that change and remove the quotes from the argument to __section(). Fixes:cfe575954d("mm: add VM_WARN_ON_ONCE_PAGE() macro") Signed-off-by: Nathan Chancellor <nathan@kernel.org> Acked-by: Hugh Dickins <hughd@google.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
81 lines
2.3 KiB
C
81 lines
2.3 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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extern void dump_page(struct page *page, const char *reason);
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extern void __dump_page(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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#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_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(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_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_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
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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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