Revert "Add patch to fix Linux kernel regression with mmap and `MAP_32BIT`"

This reverts commit d496154ab1.

The Linux kernel regression has been patched in 6.1.30 and 6.3.4.

files/patches/mono-linux-disable-mmap-MAP_32BIT.diff

@@ -1,47 +0,0 @@
-From e019d4ac4735e774d0a3c15bb36d5eb3ebfa3053 Mon Sep 17 00:00:00 2001
-From: Raphael Robatsch <raphael-git@tapesoftware.net>
-Date: Tue, 9 May 2023 11:55:02 +0200
-Subject: [PATCH] Disable mmap(MAP_32BIT) support
-
-mmap(2) with flag MAP_32BIT can erroneously return ENOMEM on recent
-kernels. Disable MAP_32BIT support for now.
-
-Reference: https://lore.kernel.org/linux-mm/cb8dc31a-fef2-1d09-f133-e9f7b9f9e77a@sony.com/
-Reference: https://lore.kernel.org/all/20230414185919.4175572-1-Liam.Howlett@oracle.com/T/#m00a0ac8a72bf2f26711b7f8cc56612a8ef62c3d0
----
- mono/mini/mini-amd64.h    | 2 --
- mono/utils/mono-codeman.c | 4 ----
- 2 files changed, 6 deletions(-)
-
-diff --git a/mono/mini/mini-amd64.h b/mono/mini/mini-amd64.h
-index a5c03c4877c..536a79ef59d 100644
---- a/mono/mini/mini-amd64.h
-+++ b/mono/mini/mini-amd64.h
-@@ -390,9 +390,7 @@ typedef struct {
- 
- #endif /* !HOST_WIN32 */
- 
--#if !defined(__linux__)
- #define MONO_ARCH_NOMAP32BIT 1
--#endif
- 
- #ifdef TARGET_WIN32
- #define MONO_AMD64_ARG_REG1 AMD64_RCX
-diff --git a/mono/utils/mono-codeman.c b/mono/utils/mono-codeman.c
-index 234aac4b0ca..5eccda92bd0 100644
---- a/mono/utils/mono-codeman.c
-+++ b/mono/utils/mono-codeman.c
-@@ -68,11 +68,7 @@ static const MonoCodeManagerCallbacks *code_manager_callbacks;
- #define MAX_WASTAGE 32
- #define MIN_BSIZE 32
- 
--#ifdef __x86_64__
--#define ARCH_MAP_FLAGS MONO_MMAP_32BIT
--#else
- #define ARCH_MAP_FLAGS 0
--#endif
- 
- #define MONO_PROT_RWX (MONO_MMAP_READ|MONO_MMAP_WRITE|MONO_MMAP_EXEC|MONO_MMAP_JIT)
- 
---
-2.40.1

patch_mono.py

@@ -34,7 +34,6 @@ def main(raw_args):
         'wasm_m2n_trampolines_hook.diff',
         'btls-cmake-args-linux-mingw.diff',
         'btls-cmake-arm64.diff',
-        'mono-linux-disable-mmap-MAP_32BIT.diff',
     ]
 
     if os.path.isfile(os.path.join(mono_source_root, 'mono/tools/offsets-tool/offsets-tool.py')):