linux-kernel - [PATCH 1/2] mm/vmalloc: export is_vmalloc_or_module

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Message-Id: <1391886730-19667-2-git-send-email-ryao@gentoo.org>
Date:	Sat,  8 Feb 2014 14:12:09 -0500
From:	Richard Yao <ryao@...too.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Eric Van Hensbergen <ericvh@...il.com>,
	Ron Minnich <rminnich@...dia.gov>,
	Latchesar Ionkov <lucho@...kov.net>,
	"David S. Miller" <davem@...emloft.net>,
	V9FS Develooper Mailing List 
	<v9fs-developer@...ts.sourceforge.net>,
	Linux Netdev Mailing List <netdev@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	Will Deacon <will.deacon@....com>,
	Christopher Covington <cov@...eaurora.org>,
	Matthew Thode <mthode@...ode.org>
Subject: [PATCH 1/2] mm/vmalloc: export is_vmalloc_or_module_addr

9p-virtio needs is_vmalloc_or_module_addr exported before a patch can be
merged to prevent the virtio zero-copy routines from triggering a
hypervisor page fault when loading kernel modules:

https://groups.google.com/forum/#!topic/linux.kernel/eRR7AyLE29Y

Without this export, the kernel build breaks with that patch applied and
CONFIG_NET_9P_VIRTIO=m. With this export in place, all is well.

Signed-off-by: Richard Yao <ryao@...too.org>
---
 mm/vmalloc.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 0fdf968..8a2e54f 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -218,6 +218,7 @@ int is_vmalloc_or_module_addr(const void *x)
 #endif
 	return is_vmalloc_addr(x);
 }
+EXPORT_SYMBOL(is_vmalloc_or_module_addr);
 
 /*
  * Walk a vmap address to the struct page it maps.
-- 
1.8.3.2

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