[reactos] 04/06: [NTOS:MM] Do not use atomic operations to set a bit while holding a lock.

[Jérôme Gardou]

https://git.reactos.org/?p=reactos.git;a=commitdiff;h=8494688eebecb28797356…

commit 8494688eebecb287973569dc1261fd0741706324
Author:     Jérôme Gardou <jerome.gardou(a)reactos.org>
AuthorDate: Thu Mar 18 09:05:00 2021 +0100
Commit:     Jérôme Gardou <zefklop(a)users.noreply.github.com>
CommitDate: Thu Mar 18 12:24:21 2021 +0100

    [NTOS:MM] Do not use atomic operations to set a bit while holding a lock.
    
    Saving your fingers from typing it doesn't make it better code.
---
 ntoskrnl/mm/ARM3/expool.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ntoskrnl/mm/ARM3/expool.c b/ntoskrnl/mm/ARM3/expool.c
index fb55f9159ba..95bc21ad822 100644
--- a/ntoskrnl/mm/ARM3/expool.c
+++ b/ntoskrnl/mm/ARM3/expool.c
@@ -1734,7 +1734,7 @@ ExpFindAndRemoveTagBigPages(IN PVOID Va,
     // Set the free bit, and decrement the number of allocations. Finally, release
     // the lock and return the tag that was located
     //
-    InterlockedIncrement((PLONG)&Entry->Va);
+    Entry->Va = (PVOID)((ULONG_PTR)Entry->Va | POOL_BIG_TABLE_ENTRY_FREE);
 
     ExpPoolBigEntriesInUse--;