linux-next: build failure after merge of the akpm-current tree

Stephen Rothwell
2015-01-19T08:17:29Z

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Hi Andrew,

After merging the akpm tree, today's linux-next build (sparc defconfig)
failed like this:

In file included from arch/sparc/include/asm/bug.h:20:0,
from include/linux/bug.h:4,
from include/linux/thread_info.h:11,
from include/asm-generic/preempt.h:4,
from arch/sparc/include/generated/asm/preempt.h:1,
from include/linux/preempt.h:18,
from include/linux/spinlock.h:50,
from include/linux/mmzone.h:7,
from include/linux/gfp.h:5,
from include/linux/slab.h:14,
from mm/mmap.c:12:
mm/mmap.c: In function 'exit_mmap':
mm/mmap.c:2858:46: error: 'PUD_SHIFT' undeclared (first use in this function)
round_up(FIRST_USER_ADDRESS, PUD_SIZE) >> PUD_SHIFT);
^
include/asm-generic/bug.h:86:25: note: in definition of macro 'WARN_ON'
int __ret_warn_on = !!(condition); \
^
mm/mmap.c:2858:46: note: each undeclared identifier is reported only once for each function it appears in
round_up(FIRST_USER_ADDRESS, PUD_SIZE) >> PUD_SHIFT);
^
include/asm-generic/bug.h:86:25: note: in definition of macro 'WARN_ON'
int __ret_warn_on = !!(condition); \
^

Caused by commit b316feb3c37f ("mm: account pmd page tables to the
process"). 32 bit sparc does not seem to define PUD_SHIFT ...

I am not sure what the correct fix is here, so I just did the following
patch for today.

From: Stephen Rothwell <sfr@canb.auug.org.au>
Date: Mon, 19 Jan 2015 19:10:53 +1100
Subject: [PATCH] mm: account pmd page tables to the process fix

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
---
mm/mmap.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/mm/mmap.c b/mm/mmap.c
index 6a7d36d133fb..25271805ab39 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -2854,8 +2854,10 @@ void exit_mmap(struct mm_struct *mm)

WARN_ON(atomic_long_read(&mm->nr_ptes) >
round_up(FIRST_USER_ADDRESS, PMD_SIZE) >> PMD_SHIFT);
+#ifdef PUD_SHIFT
WARN_ON(mm_nr_pmds(mm) >
round_up(FIRST_USER_ADDRESS, PUD_SIZE) >> PUD_SHIFT);
+#endif
}

/* Insert vm structure into process list sorted by address
--
2.1.4

--
Cheers,
Stephen Rothwell sfr@canb.auug.org.au

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