From c6538b70f5f0a5a1da8895c169c2cb9189148d85 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Alex=20R=C3=B8nne=20Petersen?= <alex@alexrp.com>
Date: Fri, 30 Jan 2026 23:58:47 +0100
Subject: [PATCH 1/3] llvm: handle packed structs in C ABI integer promotion

---
 src/codegen/llvm.zig | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/src/codegen/llvm.zig b/src/codegen/llvm.zig
index 358d4ac469..26369d2ce9 100644
--- a/src/codegen/llvm.zig
+++ b/src/codegen/llvm.zig
@@ -12608,8 +12608,7 @@ fn ccAbiPromoteInt(cc: std.builtin.CallingConvention, zcu: *Zcu, ty: Type) ?std.
     }
     const int_info = switch (ty.zigTypeTag(zcu)) {
         .bool => Type.u1.intInfo(zcu),
-        .int, .@"enum", .error_set => ty.intInfo(zcu),
-        else => return null,
+        else => if (ty.isAbiInt(zcu)) ty.intInfo(zcu) else return null,
     };
     return switch (target.os.tag) {
         .driverkit, .ios, .maccatalyst, .macos, .watchos, .tvos, .visionos => switch (int_info.bits) {

From cbe38f771c0cb7d098878e8e703ed23620f868f7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Alex=20R=C3=B8nne=20Petersen?= <alex@alexrp.com>
Date: Fri, 30 Jan 2026 23:58:17 +0100
Subject: [PATCH 2/3] std.Io.Threaded: consider EOPNOTSUPP to be programmer
 error in createFileMap()

Not doing so was hiding bugs (e.g. on s390x-linux).
---
 lib/std/Io/Threaded.zig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/std/Io/Threaded.zig b/lib/std/Io/Threaded.zig
index f0562504fd..918b0f43f9 100644
--- a/lib/std/Io/Threaded.zig
+++ b/lib/std/Io/Threaded.zig
@@ -16796,6 +16796,7 @@ fn createFileMap(
                 .OVERFLOW => return error.Unseekable,
                 .BADF => return errnoBug(err), // Always a race condition.
                 .INVAL => return errnoBug(err), // Invalid parameters to mmap()
+                .OPNOTSUPP => return errnoBug(err), // Bad flags with MAP.SHARED_VALIDATE on Linux.
                 else => return posix.unexpectedErrno(err),
             }
         };

From 7c68ab1d1085925ec33dc0f8a6695006b2d7a85d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Alex=20R=C3=B8nne=20Petersen?= <alex@alexrp.com>
Date: Fri, 30 Jan 2026 23:47:42 +0100
Subject: [PATCH 3/3] std.os.linux: add MAP.DROPPABLE

Introduced in Linux 6.11.
---
 lib/std/os/linux.zig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/std/os/linux.zig b/lib/std/os/linux.zig
index f5868f71e9..501ba44557 100644
--- a/lib/std/os/linux.zig
+++ b/lib/std/os/linux.zig
@@ -146,6 +146,7 @@ pub const MAP_TYPE = enum(u4) {
     SHARED = 0x01,
     PRIVATE = 0x02,
     SHARED_VALIDATE = 0x03,
+    DROPPABLE = 0x08,
 };
 
 pub const MAP = switch (native_arch) {