From d9645327b3b6d18b04ac1dd0bc4346a2af87bb9b Mon Sep 17 00:00:00 2001
From: Yann Collet <cyan@fb.com>
Date: Wed, 14 Jun 2023 20:03:39 -0700
Subject: [PATCH] fixed MEM_STATIC already defined in Linux Kernel mode

---
 contrib/linux-kernel/mem.h | 1 +
 lib/common/allocations.h   | 2 +-
 lib/common/compiler.h      | 2 ++
 3 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/contrib/linux-kernel/mem.h b/contrib/linux-kernel/mem.h
index a7231822b..2e91e7780 100644
--- a/contrib/linux-kernel/mem.h
+++ b/contrib/linux-kernel/mem.h
@@ -24,6 +24,7 @@
 /*-****************************************
 *  Compiler specifics
 ******************************************/
+#undef MEM_STATIC /* may be already defined from common/compiler.h */
 #define MEM_STATIC static inline
 
 /*-**************************************************************
diff --git a/lib/common/allocations.h b/lib/common/allocations.h
index a3153c4ba..5e8995501 100644
--- a/lib/common/allocations.h
+++ b/lib/common/allocations.h
@@ -14,7 +14,7 @@
 #define ZSTD_DEPS_NEED_MALLOC
 #include "zstd_deps.h"   /* ZSTD_malloc, ZSTD_calloc, ZSTD_free, ZSTD_memset */
 
-#include "mem.h" /* MEM_STATIC */
+#include "compiler.h" /* MEM_STATIC */
 #define ZSTD_STATIC_LINKING_ONLY
 #include "../zstd.h" /* ZSTD_customMem */
 
diff --git a/lib/common/compiler.h b/lib/common/compiler.h
index 35b9c1387..bcaa575dd 100644
--- a/lib/common/compiler.h
+++ b/lib/common/compiler.h
@@ -90,6 +90,7 @@
  * Updating the prefix is probably preferable, but requires a fairly large codemod,
  * since this name is used everywhere.
  */
+#ifndef MEM_STATIC  /* already defined in Linux Kernel mem.h */
 #if defined(__GNUC__)
 #  define MEM_STATIC static __inline UNUSED_ATTR
 #elif defined (__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */)
@@ -99,6 +100,7 @@
 #else
 #  define MEM_STATIC static  /* this version may generate warnings for unused static functions; disable the relevant warning */
 #endif
+#endif
 
 /* force no inlining */
 #ifdef _MSC_VER