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    Subject[PATCH 4.4 042/131] arm64: fix COMPAT_SHMLBA definition for large pages
    Date
    4.4-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    [ Upstream commit b9b7aebb42d1b1392f3111de61136bb6cf3aae3f ]

    ARM glibc uses (4 * __getpagesize()) for SHMLBA, which is correct for
    4KB pages and works fine for 64KB pages, but the kernel uses a hardcoded
    16KB that is too small for 64KB page based kernels. This changes the
    definition to what user space sees when using 64KB pages.

    Acked-by: Arnd Bergmann <arnd@arndb.de>
    Signed-off-by: Yury Norov <ynorov@caviumnetworks.com>
    Signed-off-by: Will Deacon <will.deacon@arm.com>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    arch/arm64/include/asm/shmparam.h | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    diff --git a/arch/arm64/include/asm/shmparam.h b/arch/arm64/include/asm/shmparam.h
    index 4df608a8459e..e368a55ebd22 100644
    --- a/arch/arm64/include/asm/shmparam.h
    +++ b/arch/arm64/include/asm/shmparam.h
    @@ -21,7 +21,7 @@
    * alignment value. Since we don't have aliasing D-caches, the rest of
    * the time we can safely use PAGE_SIZE.
    */
    -#define COMPAT_SHMLBA 0x4000
    +#define COMPAT_SHMLBA (4 * PAGE_SIZE)

    #include <asm-generic/shmparam.h>

    --
    2.19.1


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