From 067311d33e650adfe7ae23765959ddcc1ba18510 Mon Sep 17 00:00:00 2001 From: "Liam R. Howlett" Date: Wed, 1 Nov 2023 13:16:25 -0400 Subject: maple_tree: separate ma_state node from status The maple tree node is overloaded to keep status as well as the active node. This, unfortunately, results in a re-walk on underflow or overflow. Since the maple state has room, the status can be placed in its own enum in the structure. Once an underflow/overflow is detected, certain modes can restore the status to active and others may need to re-walk just that one node to see the entry. The status being an enum has the benefit of detecting unhandled status in switch statements. [Liam.Howlett@oracle.com: fix comments about MAS_*] Link: https://lkml.kernel.org/r/20231106154124.614247-1-Liam.Howlett@oracle.com [Liam.Howlett@oracle.com: update forking to separate maple state and node] Link: https://lkml.kernel.org/r/20231106154551.615042-1-Liam.Howlett@oracle.com [Liam.Howlett@oracle.com: fix mas_prev() state separation code] Link: https://lkml.kernel.org/r/20231207193319.4025462-1-Liam.Howlett@oracle.com Link: https://lkml.kernel.org/r/20231101171629.3612299-9-Liam.Howlett@oracle.com Signed-off-by: Liam R. Howlett Cc: Peng Zhang Signed-off-by: Andrew Morton --- include/linux/mm_types.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'include/linux/mm_types.h') diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h index ef18d2b25378..a66534c78c4d 100644 --- a/include/linux/mm_types.h +++ b/include/linux/mm_types.h @@ -1071,7 +1071,8 @@ struct vma_iterator { .mas = { \ .tree = &(__mm)->mm_mt, \ .index = __addr, \ - .node = MAS_START, \ + .node = NULL, \ + .status = ma_start, \ }, \ } -- cgit