[Ocfs2-devel] [PATCH 05/30] ocfs2: Handle macro zero_user_page()
Joel Becker
Joel.Becker at oracle.com
Fri Dec 21 00:54:36 PST 2007
On Thu, Dec 20, 2007 at 03:29:22PM -0800, Sunil Mushran wrote:
> Commit 01f2705daf5a36208e69d7cf95db9c330f843af6 in mainline introduced
> macro zero_user_page(). This patch allows one to build ocfs2 with
> kernels having/not having that change.
>
> Signed-off-by: Sunil Mushran <sunil.mushran at oracle.com>
Signed-off-by: Joel Becker <joel.becker at oracle.com>
> ---
> Makefile | 3 ++-
> configure.in | 5 +++++
> kapi-compat/include/highmem.h | 22 ++++++++++++++++++++++
> 3 files changed, 29 insertions(+), 1 deletions(-)
> create mode 100644 kapi-compat/include/highmem.h
>
> diff --git a/Makefile b/Makefile
> index 21ff590..b7b86db 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -10,7 +10,8 @@ LINUX_INCLUDE_FILES =
>
> KAPI_COMPAT_FILES = \
> kapi-compat/include/workqueue.h \
> - kapi-compat/include/compiler.h
> + kapi-compat/include/compiler.h \
> + kapi-compat/include/highmem.h
>
> PATCH_FILES =
>
> diff --git a/configure.in b/configure.in
> index 7faf363..47b0da0 100644
> --- a/configure.in
> +++ b/configure.in
> @@ -167,6 +167,11 @@ OCFS2_CHECK_KERNEL([uninitialized_var() in compiler-gcc4.h], compiler-gcc4.h,
> , compiler_compat_header="compiler.h", [uninitialized_var])
> KAPI_COMPAT_HEADERS="$KAPI_COMPAT_HEADERS $compiler_compat_header"
>
> +highmem_compat_header=""
> +OCFS2_CHECK_KERNEL([zero_user_page() in highmem.h], highmem.h,
> + , highmem_compat_header="highmem.h", [zero_user_page])
> +KAPI_COMPAT_HEADERS="$KAPI_COMPAT_HEADERS $highmem_compat_header"
> +
> # using -include has two advantages:
> # the source doesn't need to know to include compat headers
> # the compat header file names don't go through the search path
> diff --git a/kapi-compat/include/highmem.h b/kapi-compat/include/highmem.h
> new file mode 100644
> index 0000000..a8c7e11
> --- /dev/null
> +++ b/kapi-compat/include/highmem.h
> @@ -0,0 +1,22 @@
> +#ifndef KAPI_HIGHMEM_H
> +#define KAPI_HIGHMEM_H
> +
> +/*
> + * Same but also flushes aliased cache contents to RAM.
> + *
> + * This must be a macro because KM_USER0 and friends aren't defined if
> + * !CONFIG_HIGHMEM
> + */
> +#define zero_user_page(page, offset, size, km_type) \
> + do { \
> + void *kaddr; \
> + \
> + BUG_ON((offset) + (size) > PAGE_SIZE); \
> + \
> + kaddr = kmap_atomic(page, km_type); \
> + memset((char *)kaddr + (offset), 0, (size)); \
> + flush_dcache_page(page); \
> + kunmap_atomic(kaddr, (km_type)); \
> + } while (0)
> +
> +#endif
> --
> 1.5.2.5
>
>
> _______________________________________________
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> Ocfs2-devel at oss.oracle.com
> http://oss.oracle.com/mailman/listinfo/ocfs2-devel
--
"Friends may come and go, but enemies accumulate."
- Thomas Jones
Joel Becker
Principal Software Developer
Oracle
E-mail: joel.becker at oracle.com
Phone: (650) 506-8127
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