Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit cfe57595 authored by Alex Shi's avatar Alex Shi Committed by Sasha Levin
Browse files

mm: add VM_WARN_ON_ONCE_PAGE() macro 

[ Upstream commit a4055888629bc0467d12d912cd7c90acdf3d9b12 part ]

Add VM_WARN_ON_ONCE_PAGE() macro.

Link: https://lkml.kernel.org/r/1604283436-18880-3-git-send-email-alex.shi@linux.alibaba.com


Signed-off-by: default avatarAlex Shi <alex.shi@linux.alibaba.com>
Acked-by: default avatarMichal Hocko <mhocko@suse.com>
Acked-by: default avatarHugh Dickins <hughd@google.com>
Acked-by: default avatarJohannes Weiner <hannes@cmpxchg.org>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>

Note on stable backport: original commit was titled
mm/memcg: warning on !memcg after readahead page charged
which included uses of this macro in mm/memcontrol.c: here omitted.

Signed-off-by: default avatarHugh Dickins <hughd@google.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 42f11f0f

include/linux/mmdebug.h

+13 −0
Original line number Diff line number Diff line
@@ -37,6 +37,18 @@ void dump_mm(const struct mm_struct *mm); 
			BUG();						\

		}							\

	} while (0)

#define VM_WARN_ON_ONCE_PAGE(cond, page)	({			\

	static bool __section(".data.once") __warned;			\

	int __ret_warn_once = !!(cond);					\

									\

	if (unlikely(__ret_warn_once && !__warned)) {			\

		dump_page(page, "VM_WARN_ON_ONCE_PAGE(" __stringify(cond)")");\

		__warned = true;					\

		WARN_ON(1);						\

	}								\

	unlikely(__ret_warn_once);					\

})



#define VM_WARN_ON(cond) (void)WARN_ON(cond)

#define VM_WARN_ON_ONCE(cond) (void)WARN_ON_ONCE(cond)

#define VM_WARN_ONCE(cond, format...) (void)WARN_ONCE(cond, format)
@@ -48,6 +60,7 @@ void dump_mm(const struct mm_struct *mm); 
#define VM_BUG_ON_MM(cond, mm) VM_BUG_ON(cond)

#define VM_WARN_ON(cond) BUILD_BUG_ON_INVALID(cond)

#define VM_WARN_ON_ONCE(cond) BUILD_BUG_ON_INVALID(cond)

#define VM_WARN_ON_ONCE_PAGE(cond, page)  BUILD_BUG_ON_INVALID(cond)

#define VM_WARN_ONCE(cond, format...) BUILD_BUG_ON_INVALID(cond)

#define VM_WARN(cond, format...) BUILD_BUG_ON_INVALID(cond)

#endif