linux-kernel - [RFC Patch V1 11/30] mm, char/mspec.c: Use cpu_to_mem()/numa_mem

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Message-Id: <1405064267-11678-12-git-send-email-jiang.liu@linux.intel.com>
Date:	Fri, 11 Jul 2014 15:37:28 +0800
From:	Jiang Liu <jiang.liu@...ux.intel.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mgorman@...e.de>,
	David Rientjes <rientjes@...gle.com>,
	Mike Galbraith <umgwanakikbuti@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	"Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
	Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Jiang Liu <jiang.liu@...ux.intel.com>,
	Tony Luck <tony.luck@...el.com>, linux-mm@...ck.org,
	linux-hotplug@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [RFC Patch V1 11/30] mm, char/mspec.c: Use cpu_to_mem()/numa_mem_id() to support memoryless node

When CONFIG_HAVE_MEMORYLESS_NODES is enabled, cpu_to_node()/numa_node_id()
may return a node without memory, and later cause system failure/panic
when calling kmalloc_node() and friends with returned node id.
So use cpu_to_mem()/numa_mem_id() instead to get the nearest node with
memory for the/current cpu.

If CONFIG_HAVE_MEMORYLESS_NODES is disabled, cpu_to_mem()/numa_mem_id()
is the same as cpu_to_node()/numa_node_id().

Signed-off-by: Jiang Liu <jiang.liu@...ux.intel.com>
---
 drivers/char/mspec.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/char/mspec.c b/drivers/char/mspec.c
index f1d7fa45c275..20e893cde9fd 100644
--- a/drivers/char/mspec.c
+++ b/drivers/char/mspec.c
@@ -206,7 +206,7 @@ mspec_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 
 	maddr = (volatile unsigned long) vdata->maddr[index];
 	if (maddr == 0) {
-		maddr = uncached_alloc_page(numa_node_id(), 1);
+		maddr = uncached_alloc_page(numa_mem_id(), 1);
 		if (maddr == 0)
 			return VM_FAULT_OOM;
 
-- 
1.7.10.4

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