linux-kernel - [RFC v2 1/3] vmalloc: export __vmalloc_node_range for CONFIG_TEST_VMALLOC

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Date:   Mon, 31 Dec 2018 14:26:38 +0100
From:   "Uladzislau Rezki (Sony)" <urezki@...il.com>
To:     Michal Hocko <mhocko@...e.com>, Kees Cook <keescook@...omium.org>,
        Shuah Khan <shuah@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Matthew Wilcox <willy@...radead.org>,
        Oleksiy Avramchenko <oleksiy.avramchenko@...ymobile.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Uladzislau Rezki (Sony)" <urezki@...il.com>
Subject: [RFC v2 1/3] vmalloc: export __vmalloc_node_range for CONFIG_TEST_VMALLOC_MODULE

Export __vmaloc_node_range() function if CONFIG_TEST_VMALLOC_MODULE is
enabled. Some test cases in vmalloc test suite module require and make
use of that function. Please note, that it is not supposed to be used
for other purposes.

We need it only for performance analysis, stressing and stability check
of vmalloc allocator.

Signed-off-by: Uladzislau Rezki (Sony) <urezki@...il.com>
---
 mm/vmalloc.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index cfea25be7754..50ccb8bdfad8 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -1764,6 +1764,15 @@ void *__vmalloc_node_range(unsigned long size, unsigned long align,
 	return NULL;
 }
 
+/*
+ * This is only for performance analysis of vmalloc and stress purpose.
+ * It is required by vmalloc test module, therefore do not use it other
+ * than that.
+ */
+#ifdef CONFIG_TEST_VMALLOC_MODULE
+EXPORT_SYMBOL(__vmalloc_node_range);
+#endif
+
 /**
  *	__vmalloc_node  -  allocate virtually contiguous memory
  *	@size:		allocation size
-- 
2.11.0