linux-kernel - [PATCH v2 3/4] s390/sclp: Remove MHP_OFFLINE

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Message-ID: <20251009131839.3739108-4-sumanthk@linux.ibm.com>
Date: Thu,  9 Oct 2025 15:18:38 +0200
From: Sumanth Korikkar <sumanthk@...ux.ibm.com>
To: Andrew Morton <akpm@...ux-foundation.org>,
        David Hildenbrand <david@...hat.com>, linux-mm <linux-mm@...ck.org>
Cc: LKML <linux-kernel@...r.kernel.org>,
        linux-s390 <linux-s390@...r.kernel.org>,
        Gerald Schaefer <gerald.schaefer@...ux.ibm.com>,
        Heiko Carstens <hca@...ux.ibm.com>, Vasily Gorbik <gor@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Sumanth Korikkar <sumanthk@...ux.ibm.com>
Subject: [PATCH v2 3/4] s390/sclp: Remove MHP_OFFLINE_INACCESSIBLE

mhp_flag MHP_OFFLINE_INACCESSIBLE was used to mark memory as not
accessible until memory hotplug online phase begins.

Earlier, standby memory blocks were added upfront during boottime and
MHP_OFFLINE_INACCESSIBLE flag avoided page_init_poison() on memmap
during mhp addtion phase.

However with dynamic runtime configuration of memory, standby memory can
be brought to accessible state before performing add_memory(). Hence,
remove MHP_OFFLINE_INACCESSIBLE.

Acked-by: Heiko Carstens <hca@...ux.ibm.com>
Reviewed-by: David Hildenbrand <david@...hat.com>
Signed-off-by: Sumanth Korikkar <sumanthk@...ux.ibm.com>
---
 drivers/s390/char/sclp_mem.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/s390/char/sclp_mem.c b/drivers/s390/char/sclp_mem.c
index e1302b1c98ac..0f8c0a4dbdd3 100644
--- a/drivers/s390/char/sclp_mem.c
+++ b/drivers/s390/char/sclp_mem.c
@@ -224,7 +224,7 @@ static ssize_t config_sclp_mem_store(struct kobject *kobj, struct kobj_attribute
 		__arch_set_page_nodat((void *)__va(addr), block_size >> PAGE_SHIFT);
 		rc = __add_memory(0, addr, block_size,
 				  sclp_mem->memmap_on_memory ?
-				  MHP_MEMMAP_ON_MEMORY | MHP_OFFLINE_INACCESSIBLE : MHP_NONE);
+				  MHP_MEMMAP_ON_MEMORY : MHP_NONE);
 		if (rc) {
 			sclp_mem_change_state(addr, block_size, 0);
 			goto out_unlock;
-- 
2.48.1