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    Subject[PATCH v3 03/17] arm64, hibernate: remove gotos in create_safe_exec_page
    Date
    Usually, gotos are used to handle cleanup after exception, but
    in case of create_safe_exec_page there are no clean-ups. So,
    simply return the errors directly.

    Signed-off-by: Pavel Tatashin <pasha.tatashin@soleen.com>
    ---
    arch/arm64/kernel/hibernate.c | 28 +++++++++-------------------
    1 file changed, 9 insertions(+), 19 deletions(-)

    diff --git a/arch/arm64/kernel/hibernate.c b/arch/arm64/kernel/hibernate.c
    index 4bb4d17a6a7c..c8211108ec11 100644
    --- a/arch/arm64/kernel/hibernate.c
    +++ b/arch/arm64/kernel/hibernate.c
    @@ -198,17 +198,14 @@ static int create_safe_exec_page(void *src_start, size_t length,
    unsigned long dst_addr,
    phys_addr_t *phys_dst_addr)
    {
    - int rc = 0;
    pgd_t *pgdp;
    pud_t *pudp;
    pmd_t *pmdp;
    pte_t *ptep;
    unsigned long dst = get_safe_page(GFP_ATOMIC);

    - if (!dst) {
    - rc = -ENOMEM;
    - goto out;
    - }
    + if (!dst)
    + return -ENOMEM;

    memcpy((void *)dst, src_start, length);
    __flush_icache_range(dst, dst + length);
    @@ -216,30 +213,24 @@ static int create_safe_exec_page(void *src_start, size_t length,
    pgdp = pgd_offset_raw((void *)get_safe_page(GFP_ATOMIC), dst_addr);
    if (pgd_none(READ_ONCE(*pgdp))) {
    pudp = (void *)get_safe_page(GFP_ATOMIC);
    - if (!pudp) {
    - rc = -ENOMEM;
    - goto out;
    - }
    + if (!pudp)
    + return -ENOMEM;
    pgd_populate(&init_mm, pgdp, pudp);
    }

    pudp = pud_offset(pgdp, dst_addr);
    if (pud_none(READ_ONCE(*pudp))) {
    pmdp = (void *)get_safe_page(GFP_ATOMIC);
    - if (!pmdp) {
    - rc = -ENOMEM;
    - goto out;
    - }
    + if (!pmdp)
    + return -ENOMEM;
    pud_populate(&init_mm, pudp, pmdp);
    }

    pmdp = pmd_offset(pudp, dst_addr);
    if (pmd_none(READ_ONCE(*pmdp))) {
    ptep = (void *)get_safe_page(GFP_ATOMIC);
    - if (!ptep) {
    - rc = -ENOMEM;
    - goto out;
    - }
    + if (!ptep)
    + return -ENOMEM;
    pmd_populate_kernel(&init_mm, pmdp, ptep);
    }

    @@ -265,8 +256,7 @@ static int create_safe_exec_page(void *src_start, size_t length,

    *phys_dst_addr = virt_to_phys((void *)dst);

    -out:
    - return rc;
    + return 0;
    }

    #define dcache_clean_range(start, end) __flush_dcache_area(start, (end - start))
    --
    2.23.0
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