From 2fe9ea5d3ad69d880138d98b2ae8d2c4309eeafa Mon Sep 17 00:00:00 2001
From: Vladimir Kondratyev <wulf@FreeBSD.org>
Date: Wed, 29 Sep 2021 23:12:58 +0300
Subject: [PATCH] LinuxKPI: allocate current before taking shrinkers lock

This fixes following warnings when shrinkers are invoked first time:

uma_zalloc_debug: zone "lkpicurr" with the following non-sleepable
locks held: exclusive sleep mutex lkpi-shrinker (lkpi-shrinker)

uma_zalloc_debug: zone "lkpimm" with the following non-sleepable locks
held: exclusive sleep mutex lkpi-shrinker (lkpi-shrinker)

Reviewed by:	hselasky, manu
MFC after:	2 weeks
Differential revision:	https://reviews.freebsd.org/D32066
---
 sys/compat/linuxkpi/common/src/linux_shrinker.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sys/compat/linuxkpi/common/src/linux_shrinker.c b/sys/compat/linuxkpi/common/src/linux_shrinker.c
index 0423f4e0580..b66316c2201 100644
--- a/sys/compat/linuxkpi/common/src/linux_shrinker.c
+++ b/sys/compat/linuxkpi/common/src/linux_shrinker.c
@@ -36,6 +36,7 @@ __FBSDID("$FreeBSD$");
 #include <sys/eventhandler.h>
 #include <sys/mutex.h>
 
+#include <linux/compat.h>
 #include <linux/shrinker.h>
 
 TAILQ_HEAD(, shrinker) lkpi_shrinkers = TAILQ_HEAD_INITIALIZER(lkpi_shrinkers);
@@ -93,6 +94,7 @@ linuxkpi_vm_lowmem(void *arg __unused)
 {
 	struct shrinker *s;
 
+	linux_set_current(curthread);
 	mtx_lock(&mtx_shrinker);
 	TAILQ_FOREACH(s, &lkpi_shrinkers, next) {
 		shrinker_shrink(s);