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From:   Claudio Imbrenda <imbrenda@linux.ibm.com>
To:     linux-kernel@vger.kernel.org
Cc:     kvm@vger.kernel.org, linux-s390@vger.kernel.org,
        frankja@linux.ibm.com, borntraeger@de.ibm.com, cohuck@redhat.com,
        david@redhat.com, linux-mm@kvack.org,
        Andrew Morton <akpm@linux-foundation.org>,
        Nicholas Piggin <npiggin@gmail.com>,
        Uladzislau Rezki <urezki@gmail.com>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>,
        David Rientjes <rientjes@google.com>
Subject: [PATCH v2 1/2] mm/vmalloc: export __vmalloc_node_range
Date:   Tue,  8 Jun 2021 20:06:17 +0200
Message-Id: <20210608180618.477766-2-imbrenda@linux.ibm.com>
In-Reply-To: <20210608180618.477766-1-imbrenda@linux.ibm.com>
References: <20210608180618.477766-1-imbrenda@linux.ibm.com>
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The recent patches to add support for hugepage vmalloc mappings added a
flag for __vmalloc_node_range to allow to request small pages.
This flag is not accessible when calling vmalloc, the only option is to
call directly __vmalloc_node_range, which is not exported.

This means that a module can't vmalloc memory with small pages.

Case in point: KVM on s390x needs to vmalloc a large area, and it needs
to be mapped with small pages, because of a hardware limitation.

This patch exports __vmalloc_node_range so it can be used in modules
too.

Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Uladzislau Rezki (Sony) <urezki@gmail.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: David Rientjes <rientjes@google.com>
---
 mm/vmalloc.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index a13ac524f6ff..bd6fa160b31b 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -2937,6 +2937,7 @@ void *__vmalloc_node_range(unsigned long size, unsigned long align,
 
 	return NULL;
 }
+EXPORT_SYMBOL_GPL(__vmalloc_node_range);
 
 /**
  * __vmalloc_node - allocate virtually contiguous memory
-- 
2.31.1