linux-kernel - [PATCH 4/5] powerpc/memhotplug: Enable MHP_MEMMAP_ON

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Message-Id: <20201217130758.11565-5-osalvador@suse.de>
Date:   Thu, 17 Dec 2020 14:07:57 +0100
From:   Oscar Salvador <osalvador@...e.de>
To:     akpm@...ux-foundation.org
Cc:     david@...hat.com, mhocko@...nel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, vbabka@...e.cz, pasha.tatashin@...een.com,
        Oscar Salvador <osalvador@...e.de>
Subject: [PATCH 4/5] powerpc/memhotplug: Enable MHP_MEMMAP_ON_MEMORY when supported

Let the caller check whether it can pass MHP_MEMMAP_ON_MEMORY by
checking mhp_supports_memmap_on_memory().
MHP_MEMMAP_ON_MEMORY can only be set in case
ARCH_MHP_MEMMAP_ON_MEMORY_ENABLE is enabled, the architecture supports
altmap, and the range to be added spans a single memory block.

Signed-off-by: Oscar Salvador <osalvador@...e.de>
---
 arch/powerpc/platforms/pseries/hotplug-memory.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/platforms/pseries/hotplug-memory.c b/arch/powerpc/platforms/pseries/hotplug-memory.c
index 7efe6ec5d14a..a7f68e282ec1 100644
--- a/arch/powerpc/platforms/pseries/hotplug-memory.c
+++ b/arch/powerpc/platforms/pseries/hotplug-memory.c
@@ -610,6 +610,7 @@ static int dlpar_memory_remove_by_ic(u32 lmbs_to_remove, u32 drc_index)
 
 static int dlpar_add_lmb(struct drmem_lmb *lmb)
 {
+	mhp_t mhp_flags = MHP_NONE;
 	unsigned long block_sz;
 	int nid, rc;
 
@@ -629,8 +630,10 @@ static int dlpar_add_lmb(struct drmem_lmb *lmb)
 	if (nid < 0 || !node_possible(nid))
 		nid = first_online_node;
 
+	if (mhp_supports_memmap_on_memory(block_sz))
+		mhp_flags |= MHP_MEMMAP_ON_MEMORY;
 	/* Add the memory */
-	rc = __add_memory(nid, lmb->base_addr, block_sz, MHP_NONE);
+	rc = __add_memory(nid, lmb->base_addr, block_sz, mhp_flags);
 	if (rc) {
 		invalidate_lmb_associativity_index(lmb);
 		return rc;
-- 
2.26.2