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Message-Id: <20120205220952.143885576@pcw.home.local>
Date: Sun, 05 Feb 2012 23:10:52 +0100
From: Willy Tarreau <w@....eu>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc: Nick Piggin <npiggin@...e.de>,
Xiao Guangrong <xiaoguangrong@...fujitsu.com>,
Marcelo Tosatti <mtosatti@...hat.com>,
Robert Richter <robert.richter@....com>,
Greg KH <gregkh@...uxfoundation.org>
Subject: [PATCH 63/91] export __get_user_pages_fast() function
2.6.27-longterm review patch. If anyone has any objections, please let us know.
------------------
commit 45888a0c6edc305495b6bd72a30e66bc40b324c6 upstream.
Backport for stable kernel v2.6.32.y to v2.6.36.y.
Needed for next patch:
oprofile, x86: Fix nmi-unsafe callgraph support
This function is used by KVM to pin process's page in the atomic context.
Define the 'weak' function to avoid other architecture not support it
Acked-by: Nick Piggin <npiggin@...e.de>
Signed-off-by: Xiao Guangrong <xiaoguangrong@...fujitsu.com>
Signed-off-by: Marcelo Tosatti <mtosatti@...hat.com>
Signed-off-by: Robert Richter <robert.richter@....com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
---
mm/util.c | 13 +++++++++++++
1 files changed, 13 insertions(+), 0 deletions(-)
Index: longterm-2.6.27/mm/util.c
===================================================================
--- longterm-2.6.27.orig/mm/util.c 2012-02-05 22:34:33.070915063 +0100
+++ longterm-2.6.27/mm/util.c 2012-02-05 22:34:43.848914804 +0100
@@ -101,6 +101,19 @@
}
EXPORT_SYMBOL(__krealloc);
+/*
+ * Like get_user_pages_fast() except its IRQ-safe in that it won't fall
+ * back to the regular GUP.
+ * If the architecture not support this fucntion, simply return with no
+ * page pinned
+ */
+int __attribute__((weak)) __get_user_pages_fast(unsigned long start,
+ int nr_pages, int write, struct page **pages)
+{
+ return 0;
+}
+EXPORT_SYMBOL_GPL(__get_user_pages_fast);
+
/**
* krealloc - reallocate memory. The contents will remain unchanged.
* @p: object to reallocate memory for.
--
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