From: NAKAMURA Takumi <geek4civic@gmail.com>
Date: Thu, 22 Aug 2013 10:23:52 +0000 (+0000)
Subject: MemoryBuffer.cpp: Consider if PageSize were not 4096 in shouldUseMmap(). Follow-up... 
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=378cd84adfe988166c3a45005043b506e3485c34;p=oota-llvm.git

MemoryBuffer.cpp: Consider if PageSize were not 4096 in shouldUseMmap(). Follow-up to r188903.

The AllocationGranularity can be 65536 on Win32, even on Cygwin.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@188998 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Support/MemoryBuffer.cpp b/lib/Support/MemoryBuffer.cpp
index cab45c736b5..1c45c69ff3f 100644
--- a/lib/Support/MemoryBuffer.cpp
+++ b/lib/Support/MemoryBuffer.cpp
@@ -276,7 +276,7 @@ static bool shouldUseMmap(int FD,
                           int PageSize) {
   // We don't use mmap for small files because this can severely fragment our
   // address space.
-  if (MapSize < 4096*4)
+  if (MapSize < 4 * 4096 || MapSize < (unsigned)PageSize)
     return false;
 
   if (!RequiresNullTerminator)