[lld] 603d41a - [ELF] decompress: remove mutex

[Fangrui Song via llvm-commits]

Author: Fangrui Song
Date: 2024-12-01T14:02:44-08:00
New Revision: 603d41ab7b4078a00a5d3b899d3b9d14eea2d8ff

URL: https://github.com/llvm/llvm-project/commit/603d41ab7b4078a00a5d3b899d3b9d14eea2d8ff
DIFF: https://github.com/llvm/llvm-project/commit/603d41ab7b4078a00a5d3b899d3b9d14eea2d8ff.diff

LOG: [ELF] decompress: remove mutex

decompress() is in the parallel code path splitIntoPieces
and we should avoid mutex.

Added: 
    

Modified: 
    lld/ELF/InputSection.cpp

Removed: 
    


################################################################################
diff  --git a/lld/ELF/InputSection.cpp b/lld/ELF/InputSection.cpp
index 51065b63f7b83a..30c2ff4d79ba5b 100644
--- a/lld/ELF/InputSection.cpp
+++ b/lld/ELF/InputSection.cpp
@@ -128,15 +128,9 @@ static void decompressAux(Ctx &ctx, const InputSectionBase &sec, uint8_t *out,
 
 void InputSectionBase::decompress() const {
   Ctx &ctx = getCtx();
-  uint8_t *uncompressedBuf;
-  {
-    static std::mutex mu;
-    std::lock_guard<std::mutex> lock(mu);
-    uncompressedBuf = ctx.bAlloc.Allocate<uint8_t>(size);
-  }
-
-  invokeELFT(decompressAux, ctx, *this, uncompressedBuf, size);
-  content_ = uncompressedBuf;
+  uint8_t *buf = makeThreadLocalN<uint8_t>(size);
+  invokeELFT(decompressAux, ctx, *this, buf, size);
+  content_ = buf;
   compressed = false;
 }