[reactos] 03/12: [NTOS:MM] Get rid of MmSetCleanAllRmaps and MmIsDirtyPageRmap

[Jérôme Gardou]

https://git.reactos.org/?p=reactos.git;a=commitdiff;h=9e121fb6c25077dedf9cfe...

commit 9e121fb6c25077dedf9cfeb74edda3f1ad411dbf
Author:     Jérôme Gardou [e-mail]
AuthorDate: Wed Mar 10 15:16:29 2021 +0100
Commit:     Jérôme Gardou [e-mail]
CommitDate: Thu Apr 8 15:40:37 2021 +0200

[NTOS:MM] Get rid of MmSetCleanAllRmaps and MmIsDirtyPageRmap

Everything is wrong with them. Bad locking. Bad logic.
---
 ntoskrnl/include/internal/mm.h |  7 ------
 ntoskrnl/mm/rmap.c             | 55 ------------------------------------------
 ntoskrnl/mm/section.c          |  5 +---
 3 files changed, 1 insertion(+), 66 deletions(-)

diff --git a/ntoskrnl/include/internal/mm.h b/ntoskrnl/include/internal/mm.h
index d05360c28be..f5dd0a4e049 100644
--- a/ntoskrnl/include/internal/mm.h
+++ b/ntoskrnl/include/internal/mm.h
@@ -903,13 +903,6 @@ VOID
 NTAPI
 MmInitializeRmapList(VOID);

-VOID
-NTAPI
-MmSetCleanAllRmaps(PFN_NUMBER Page);
-BOOLEAN
-NTAPI
-MmIsDirtyPageRmap(PFN_NUMBER Page);
-
 NTSTATUS
 NTAPI
 MmPageOutPhysicalAddress(PFN_NUMBER Page);
diff --git a/ntoskrnl/mm/rmap.c b/ntoskrnl/mm/rmap.c
index 973b8342a5e..c680a8f7a9f 100644
--- a/ntoskrnl/mm/rmap.c
+++ b/ntoskrnl/mm/rmap.c
@@ -307,61 +307,6 @@ WriteSegment:
     return STATUS_UNSUCCESSFUL;
 }

-VOID
-NTAPI
-MmSetCleanAllRmaps(PFN_NUMBER Page)
-{
-    PMM_RMAP_ENTRY current_entry;
-    KIRQL OldIrql;
-
-    OldIrql = MiAcquirePfnLock();
-    current_entry = MmGetRmapListHeadPage(Page);
-    if (current_entry == NULL)
-    {
-        DPRINT1("MmSetCleanAllRmaps: No rmaps.\n");
-        KeBugCheck(MEMORY_MANAGEMENT);
-    }
-    while (current_entry != NULL)
-    {
-        if (!RMAP_IS_SEGMENT(current_entry->Address))
-            MmSetCleanPage(current_entry->Process, current_entry->Address);
-        current_entry = current_entry->Next;
-    }
-    MiReleasePfnLock(OldIrql);
-}
-
-BOOLEAN
-NTAPI
-MmIsDirtyPageRmap(PFN_NUMBER Page)
-{
-    PMM_RMAP_ENTRY current_entry;
-    KIRQL OldIrql;
-    BOOLEAN Dirty = FALSE;
-
-    OldIrql = MiAcquirePfnLock();
-    current_entry = MmGetRmapListHeadPage(Page);
-    if (current_entry == NULL)
-    {
-        DPRINT1("MmIsDirtyPageRmap: No rmaps.\n");
-        KeBugCheck(MEMORY_MANAGEMENT);
-    }
-    while (current_entry != NULL)
-    {
-        if (!RMAP_IS_SEGMENT(current_entry->Address))
-        {
-            if (MmIsDirtyPage(current_entry->Process, current_entry->Address))
-            {
-                Dirty = TRUE;
-                break;
-            }
-        }
-        current_entry = current_entry->Next;
-    }
-    MiReleasePfnLock(OldIrql);
-
-    return Dirty;
-}
-
 VOID
 NTAPI
 MmInsertRmap(PFN_NUMBER Page, PEPROCESS Process,
diff --git a/ntoskrnl/mm/section.c b/ntoskrnl/mm/section.c
index 88392afee7d..5df50f191ef 100644
--- a/ntoskrnl/mm/section.c
+++ b/ntoskrnl/mm/section.c
@@ -4848,9 +4848,6 @@ MmCheckDirtySegment(
         Entry = WRITE_SSE(Entry);
         MmSetPageEntrySectionSegment(Segment, Offset, Entry);

-        /* Tell the other users that we are clean again */
-        MmSetCleanAllRmaps(Page);
-
         MmUnlockSectionSegment(Segment);

if (FlagOn(*Segment->Flags, MM_DATAFILE_SEGMENT))
@@ -4915,7 +4912,7 @@ MmCheckDirtySegment(
         else
         {
             /* Check if someone dirtified this page while we were not looking */
-            DirtyAgain = IS_DIRTY_SSE(Entry) || MmIsDirtyPageRmap(Page);
+            DirtyAgain = IS_DIRTY_SSE(Entry);
         }

/* Drop the reference we got, deleting the write altogether. */