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    Subject[PATCH v2 11/18] x86/sgx: Prepare for multiple LRUs
    Date
    From: Sean Christopherson <sean.j.christopherson@intel.com>

    Add sgx_can_reclaim() wrapper so that in a subsequent patch, multiple LRUs
    can be used cleanly.

    Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
    Signed-off-by: Kristen Carlson Accardi <kristen@linux.intel.com>
    Cc: Sean Christopherson <seanjc@google.com>
    ---
    arch/x86/kernel/cpu/sgx/main.c | 9 +++++++--
    1 file changed, 7 insertions(+), 2 deletions(-)

    diff --git a/arch/x86/kernel/cpu/sgx/main.c b/arch/x86/kernel/cpu/sgx/main.c
    index db96483e2e74..96399e2016a8 100644
    --- a/arch/x86/kernel/cpu/sgx/main.c
    +++ b/arch/x86/kernel/cpu/sgx/main.c
    @@ -394,10 +394,15 @@ static int sgx_reclaim_pages(int nr_to_scan, bool ignore_age)
    return ret;
    }

    +static bool sgx_can_reclaim(void)
    +{
    + return !list_empty(&sgx_global_lru.reclaimable);
    +}
    +
    static bool sgx_should_reclaim(unsigned long watermark)
    {
    return atomic_long_read(&sgx_nr_free_pages) < watermark &&
    - !list_empty(&sgx_global_lru.reclaimable);
    + sgx_can_reclaim();
    }

    /*
    @@ -606,7 +611,7 @@ struct sgx_epc_page *sgx_alloc_epc_page(void *owner, bool reclaim)
    break;
    }

    - if (list_empty(&sgx_global_lru.reclaimable))
    + if (!sgx_can_reclaim())
    return ERR_PTR(-ENOMEM);

    if (!reclaim) {
    --
    2.38.1
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