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    Subject[PATCH v3 resend 01/15] mm: add setup_initial_init_mm() helper
    Date
    Add setup_initial_init_mm() helper to setup kernel text,
    data and brk.

    Cc: linux-snps-arc@lists.infradead.org
    Cc: linux-arm-kernel@lists.infradead.org
    Cc: linux-csky@vger.kernel.org
    Cc: uclinux-h8-devel@lists.sourceforge.jp
    Cc: linux-m68k@lists.linux-m68k.org
    Cc: openrisc@lists.librecores.org
    Cc: linuxppc-dev@lists.ozlabs.org
    Cc: linux-riscv@lists.infradead.org
    Cc: linux-sh@vger.kernel.org
    Cc: linux-s390@vger.kernel.org
    Cc: x86@kernel.org
    Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
    ---
    include/linux/mm.h | 3 +++
    mm/init-mm.c | 9 +++++++++
    2 files changed, 12 insertions(+)

    diff --git a/include/linux/mm.h b/include/linux/mm.h
    index c274f75efcf9..02aa057540b7 100644
    --- a/include/linux/mm.h
    +++ b/include/linux/mm.h
    @@ -244,6 +244,9 @@ int __add_to_page_cache_locked(struct page *page, struct address_space *mapping,

    #define lru_to_page(head) (list_entry((head)->prev, struct page, lru))

    +void setup_initial_init_mm(void *start_code, void *end_code,
    + void *end_data, void *brk);
    +
    /*
    * Linux kernel virtual memory manager primitives.
    * The idea being to have a "virtual" mm in the same way
    diff --git a/mm/init-mm.c b/mm/init-mm.c
    index 153162669f80..b4a6f38fb51d 100644
    --- a/mm/init-mm.c
    +++ b/mm/init-mm.c
    @@ -40,3 +40,12 @@ struct mm_struct init_mm = {
    .cpu_bitmap = CPU_BITS_NONE,
    INIT_MM_CONTEXT(init_mm)
    };
    +
    +void setup_initial_init_mm(void *start_code, void *end_code,
    + void *end_data, void *brk)
    +{
    + init_mm.start_code = (unsigned long)start_code;
    + init_mm.end_code = (unsigned long)end_code;
    + init_mm.end_data = (unsigned long)end_data;
    + init_mm.brk = (unsigned long)brk;
    +}
    --
    2.26.2
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