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authorAndreas Herrmann <andreas.herrmann3@amd.com>2009-06-08 13:09:39 -0400
committerIngo Molnar <mingo@elte.hu>2009-06-08 13:18:25 -0400
commitc9690998ef48ffefeccb91c70a7739eebdea57f9 (patch)
tree01d628fd94a943ee6fe046257aa3a6be1b05390f /arch/x86/mm/memtest.c
parentc4ed3f04ba9defe22aa729d1646f970f791c03d7 (diff)
x86: memtest: remove 64-bit division
Using gcc 3.3.5 a "make allmodconfig" + "CONFIG_KVM=n" triggers a build error: arch/x86/mm/built-in.o(.init.text+0x43f7): In function `__change_page_attr': arch/x86/mm/pageattr.c:114: undefined reference to `__udivdi3' make: *** [.tmp_vmlinux1] Error 1 The culprit turned out to be a division in arch/x86/mm/memtest.c For more info see this thread: http://marc.info/?l=linux-kernel&m=124416232620683 The patch entirely removes the division that caused the build error. [ Impact: build fix with certain GCC versions ] Reported-by: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp> Signed-off-by: Andreas Herrmann <andreas.herrmann3@amd.com> Cc: Yinghai Lu <yinghai@kernel.org> Cc: xiyou.wangcong@gmail.com Cc: Andrew Morton <akpm@linux-foundation.org> Cc: <stable@kernel.org> LKML-Reference: <20090608170939.GB12431@alberich.amd.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/mm/memtest.c')
-rw-r--r--arch/x86/mm/memtest.c14
1 files changed, 7 insertions, 7 deletions
diff --git a/arch/x86/mm/memtest.c b/arch/x86/mm/memtest.c
index 605c8be06217..c0bedcd10f97 100644
--- a/arch/x86/mm/memtest.c
+++ b/arch/x86/mm/memtest.c
@@ -40,23 +40,23 @@ static void __init reserve_bad_mem(u64 pattern, u64 start_bad, u64 end_bad)
40 40
41static void __init memtest(u64 pattern, u64 start_phys, u64 size) 41static void __init memtest(u64 pattern, u64 start_phys, u64 size)
42{ 42{
43 u64 i, count; 43 u64 *p;
44 u64 *start; 44 void *start, *end;
45 u64 start_bad, last_bad; 45 u64 start_bad, last_bad;
46 u64 start_phys_aligned; 46 u64 start_phys_aligned;
47 size_t incr; 47 size_t incr;
48 48
49 incr = sizeof(pattern); 49 incr = sizeof(pattern);
50 start_phys_aligned = ALIGN(start_phys, incr); 50 start_phys_aligned = ALIGN(start_phys, incr);
51 count = (size - (start_phys_aligned - start_phys))/incr;
52 start = __va(start_phys_aligned); 51 start = __va(start_phys_aligned);
52 end = start + size - (start_phys_aligned - start_phys);
53 start_bad = 0; 53 start_bad = 0;
54 last_bad = 0; 54 last_bad = 0;
55 55
56 for (i = 0; i < count; i++) 56 for (p = start; p < end; p++)
57 start[i] = pattern; 57 *p = pattern;
58 for (i = 0; i < count; i++, start++, start_phys_aligned += incr) { 58 for (p = start; p < end; p++, start_phys_aligned += incr) {
59 if (*start == pattern) 59 if (*p == pattern)
60 continue; 60 continue;
61 if (start_phys_aligned == last_bad + incr) { 61 if (start_phys_aligned == last_bad + incr) {
62 last_bad += incr; 62 last_bad += incr;