From b7ac30197b87876f6ec81917fae19f307e187499 Mon Sep 17 00:00:00 2001
From: Alois Wohlschlager <alois1@gmx-topmail.de>
Date: Tue, 16 May 2023 19:05:33 +0200
Subject: [PATCH] linux: enable zram writeback

Zram needs CONFIG_ZRAM_WRITEBACK in order for writeback configuration
to work. Since there is even a NixOS option (zramSwap.writebackDevice)
for configuring writeback, it should be enabled.
---
 pkgs/os-specific/linux/kernel/common-config.nix | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/pkgs/os-specific/linux/kernel/common-config.nix b/pkgs/os-specific/linux/kernel/common-config.nix
index 3520f1bd5cfc..6b1a7d127a95 100644
--- a/pkgs/os-specific/linux/kernel/common-config.nix
+++ b/pkgs/os-specific/linux/kernel/common-config.nix
@@ -679,10 +679,11 @@ let
     };
 
     zram = {
-      ZRAM     = module;
-      ZSWAP    = option yes;
-      ZBUD     = option yes;
-      ZSMALLOC = module;
+      ZRAM           = module;
+      ZRAM_WRITEBACK = option yes;
+      ZSWAP          = option yes;
+      ZBUD           = option yes;
+      ZSMALLOC       = module;
     };
 
     brcmfmac = {