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SubjectRe: [PATCH v4 2/3] thp: add HPAGE_PMD_* definitions for !CONFIG_TRANSPARENT_HUGEPAGE
From
On Mon, Mar 12, 2012 at 6:30 PM, Naoya Horiguchi
<n-horiguchi@ah.jp.nec.com> wrote:
> These macros will be used in later patch, where all usage are expected
> to be optimized away without #ifdef CONFIG_TRANSPARENT_HUGEPAGE.
> But to detect unexpected usages, we convert existing BUG() to BUILD_BUG().

Just a heads up that this showed up in linux-next today as the
cause of a new build failure for an ARM board:

http://kisskb.ellerman.id.au/kisskb/buildresult/5930053/

Paul.
--

git bisect start
# good: [fde7d9049e55ab85a390be7f415d74c9f62dd0f9] Linux 3.3-rc7
git bisect good fde7d9049e55ab85a390be7f415d74c9f62dd0f9
# bad: [9166d6581d1ca6795bcd38506c7d29bf39402a7d] Add linux-next
specific files for 20120321
git bisect bad 9166d6581d1ca6795bcd38506c7d29bf39402a7d
# good: [e863be5cac0a857302ccc0129326ca3634c1136a] Merge
remote-tracking branch 'net-next/master'
git bisect good e863be5cac0a857302ccc0129326ca3634c1136a
# good: [2ac4846c531fc33783999e8819a66d0f3e36058f] Merge
remote-tracking branch 'spi/spi/next'
git bisect good 2ac4846c531fc33783999e8819a66d0f3e36058f
# good: [a3ebef77540d27811aab7514b9aeaab13c573b46] Merge
remote-tracking branch 'oprofile/for-next'
git bisect good a3ebef77540d27811aab7514b9aeaab13c573b46
# good: [3ee174051be0246173ba8a386bb7a2d20d9e27c3] [arm-soc internal]
add back contents file
git bisect good 3ee174051be0246173ba8a386bb7a2d20d9e27c3
# good: [cc61a2762110efb0868bc326be52f3ecd22c4e99] Merge
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git bisect good cc61a2762110efb0868bc326be52f3ecd22c4e99
# bad: [dd09ea75ddb4d712abe5ec8a9b37619a99d4554c] kernel/watchdog.c:
add comment to watchdog() exit path
git bisect bad dd09ea75ddb4d712abe5ec8a9b37619a99d4554c
# good: [a80d01212507a57d48912f08ca22de039f4470b8] rmap: remove
__anon_vma_link() declaration
git bisect good a80d01212507a57d48912f08ca22de039f4470b8
# good: [dfac39f6a2daa212de0eb80bf14c76a2bee23dc4] memcg: remove
PCG_CACHE page_cgroup flag
git bisect good dfac39f6a2daa212de0eb80bf14c76a2bee23dc4
# bad: [8887892fd3354617e63be2399e286a86d0f9279c] alpha: use
set_current_blocked() and block_sigmask()
git bisect bad 8887892fd3354617e63be2399e286a86d0f9279c
# good: [0d7a67d6525414f8541f4a61084d783b4b53b8ec] memcg: remove
PCG_FILE_MAPPED fix cosmetic fix
git bisect good 0d7a67d6525414f8541f4a61084d783b4b53b8ec
# good: [ea20bf604adaab3a4ffb887083e62e7d76eb5d53] memcg: clean up
existing move charge code
git bisect good ea20bf604adaab3a4ffb887083e62e7d76eb5d53
# bad: [0709378dc1d716112e10de7f687af4993e69df7b] frv: use
set_current_blocked() and block_sigmask()
git bisect bad 0709378dc1d716112e10de7f687af4993e69df7b
# bad: [3135be0275c89f28c352554a0ec1874ea7cd3c3a] memcg: avoid THP
split in task migration
git bisect bad 3135be0275c89f28c352554a0ec1874ea7cd3c3a
# bad: [92c36300cf69f6ea1267d0bba7af708560c116d7] thp: add HPAGE_PMD_*
definitions for !CONFIG_TRANSPARENT_HUGEPAGE
git bisect bad 92c36300cf69f6ea1267d0bba7af708560c116d7
paul@yow-lpgnfs-02:~/git/linux-head$



>
> Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
> Acked-by: Hillf Danton <dhillf@gmail.com>
> Reviewed-by: Andrea Arcangeli <aarcange@redhat.com>
> Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
> Acked-by: David Rientjes <rientjes@google.com>
> ---
>  include/linux/huge_mm.h |   11 ++++++-----
>  1 files changed, 6 insertions(+), 5 deletions(-)
>
> diff --git linux-next-20120307.orig/include/linux/huge_mm.h linux-next-20120307/include/linux/huge_mm.h
> index f56cacb..c8af7a2 100644
> --- linux-next-20120307.orig/include/linux/huge_mm.h
> +++ linux-next-20120307/include/linux/huge_mm.h
> @@ -51,6 +51,9 @@ extern pmd_t *page_check_address_pmd(struct page *page,
>                                     unsigned long address,
>                                     enum page_check_address_pmd_flag flag);
>
> +#define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
> +#define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
> +
>  #ifdef CONFIG_TRANSPARENT_HUGEPAGE
>  #define HPAGE_PMD_SHIFT HPAGE_SHIFT
>  #define HPAGE_PMD_MASK HPAGE_MASK
> @@ -102,8 +105,6 @@ extern void __split_huge_page_pmd(struct mm_struct *mm, pmd_t *pmd);
>                BUG_ON(pmd_trans_splitting(*____pmd) ||                 \
>                       pmd_trans_huge(*____pmd));                       \
>        } while (0)
> -#define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
> -#define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
>  #if HPAGE_PMD_ORDER > MAX_ORDER
>  #error "hugepages can't be allocated by the buddy allocator"
>  #endif
> @@ -158,9 +159,9 @@ static inline struct page *compound_trans_head(struct page *page)
>        return page;
>  }
>  #else /* CONFIG_TRANSPARENT_HUGEPAGE */
> -#define HPAGE_PMD_SHIFT ({ BUG(); 0; })
> -#define HPAGE_PMD_MASK ({ BUG(); 0; })
> -#define HPAGE_PMD_SIZE ({ BUG(); 0; })
> +#define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
> +#define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
> +#define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })
>
>  #define hpage_nr_pages(x) 1
>
> --
> 1.7.7.6
>
> --
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