linux-kernel - [PATCH] mm: fix memory_hotplug.c printk format warning

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Date:	Wed, 17 Apr 2013 17:59:26 -0700
From:	Randy Dunlap <rdunlap@...radead.org>
To:	LKML <linux-kernel@...r.kernel.org>, Linux MM <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [PATCH] mm: fix memory_hotplug.c printk format warning

From: Randy Dunlap <rdunlap@...radead.org>

PFN_PHYS() is a phys_addr_t, which can be u32 or u64.
Fix the build warning when phys_addr_t is u32.

mm/memory_hotplug.c: warning: format '%llx' expects argument of type 'long long unsigned int', but argument 2 has type 'unsigned int' [-Wformat]:  => 1685:3
mm/memory_hotplug.c: warning: format '%llx' expects argument of type 'long long unsigned int', but argument 3 has type 'unsigned int' [-Wformat]:  => 1685:3

Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
Reported-by: Geert Uytterhoeven <geert@...ux-m68k.org>
---
 mm/memory_hotplug.c |   12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

I guess this modern "%pa" is preferred over casting to (u64),
but just casting seems a simpler fix to me.  I.e.:

 	if (unlikely(ret))
 		pr_warn("removing memory fails, because memory "
 			"[%#010llx-%#010llx] is onlined\n",
-			PFN_PHYS(section_nr_to_pfn(mem->start_section_nr)),
-			PFN_PHYS(section_nr_to_pfn(mem->end_section_nr + 1))-1);
+			(u64)PFN_PHYS(section_nr_to_pfn(mem->start_section_nr)),
+			(u64)PFN_PHYS(section_nr_to_pfn(
+					mem->end_section_nr + 1))-1);
 
 	return ret;
 }

--- lnx-39-rc7.orig/mm/memory_hotplug.c
+++ lnx-39-rc7/mm/memory_hotplug.c
@@ -1681,11 +1681,15 @@ static int is_memblock_offlined_cb(struc
 {
 	int ret = !is_memblock_offlined(mem);
 
-	if (unlikely(ret))
+	if (unlikely(ret)) {
+		phys_addr_t beginpa, endpa;
+
+		beginpa = PFN_PHYS(section_nr_to_pfn(mem->start_section_nr));
+		endpa = PFN_PHYS(section_nr_to_pfn(mem->end_section_nr + 1))-1;
 		pr_warn("removing memory fails, because memory "
-			"[%#010llx-%#010llx] is onlined\n",
-			PFN_PHYS(section_nr_to_pfn(mem->start_section_nr)),
-			PFN_PHYS(section_nr_to_pfn(mem->end_section_nr + 1))-1);
+			"[%pa-%pa] is onlined\n",
+			&beginpa, &endpa);
+	}
 
 	return ret;
 }
--
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