linux-kernel - [PATCH 01/11] mm: export vmalloc_sync

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Message-Id: <1322775683-8741-2-git-send-email-mathieu.desnoyers@efficios.com>
Date:	Thu,  1 Dec 2011 16:41:13 -0500
From:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To:	Greg KH <greg@...ah.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc:	devel@...verdev.osuosl.org, lttng-dev@...ts.lttng.org,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Christoph Hellwig <hch@...radead.org>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Tejun Heo <tj@...nel.org>, David Howells <dhowells@...hat.com>,
	David McCullough <davidm@...pgear.com>,
	D Jeff Dionne <jeff@...inux.org>,
	Greg Ungerer <gerg@...pgear.com>,
	Paul Mundt <lethal@...ux-sh.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Greg KH <greg@...ah.com>
Subject: [PATCH 01/11] mm: export vmalloc_sync_all symbol to GPL modules

LTTng needs this symbol exported. It calls it to ensure its tracing
buffers and allocated data structures never trigger a page fault. This
is required to handle page fault handler tracing and NMI tracing
gracefully.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
CC: Linus Torvalds <torvalds@...ux-foundation.org>
CC: Christoph Hellwig <hch@...radead.org>
CC: Christoph Lameter <cl@...ux-foundation.org>
CC: Tejun Heo <tj@...nel.org>
CC: David Howells <dhowells@...hat.com>
CC: David McCullough <davidm@...pgear.com>
CC: D Jeff Dionne <jeff@...inux.org>
CC: Greg Ungerer <gerg@...pgear.com>
CC: Paul Mundt <lethal@...ux-sh.org>
CC: linux-mm@...ck.org
CC: linux-kernel@...r.kernel.org
CC: Greg KH <greg@...ah.com>
---
 mm/nommu.c   |    1 +
 mm/vmalloc.c |    1 +
 2 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/mm/nommu.c b/mm/nommu.c
index b982290..b22a0d9 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -441,6 +441,7 @@ EXPORT_SYMBOL_GPL(vm_unmap_aliases);
 void  __attribute__((weak)) vmalloc_sync_all(void)
 {
 }
+EXPORT_SYMBOL_GPL(vmalloc_sync_all);
 
 /**
  *	alloc_vm_area - allocate a range of kernel address space
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 3231bf3..37ddce5 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -2137,6 +2137,7 @@ EXPORT_SYMBOL(remap_vmalloc_range);
 void  __attribute__((weak)) vmalloc_sync_all(void)
 {
 }
+EXPORT_SYMBOL_GPL(vmalloc_sync_all);
 
 
 static int f(pte_t *pte, pgtable_t table, unsigned long addr, void *data)
-- 
1.7.5.4

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