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    Subject[PATCH RFC PKS/PMEM 51/58] kernel: Utilize new kmap_thread()
    Date
    From: Ira Weiny <ira.weiny@intel.com>

    This kmap() call is localized to a single thread. To avoid the over
    head of global PKRS updates use the new kmap_thread() call.

    Cc: Eric Biederman <ebiederm@xmission.com>
    Signed-off-by: Ira Weiny <ira.weiny@intel.com>
    ---
    kernel/kexec_core.c | 8 ++++----
    1 file changed, 4 insertions(+), 4 deletions(-)

    diff --git a/kernel/kexec_core.c b/kernel/kexec_core.c
    index c19c0dad1ebe..272a9920c0d6 100644
    --- a/kernel/kexec_core.c
    +++ b/kernel/kexec_core.c
    @@ -815,7 +815,7 @@ static int kimage_load_normal_segment(struct kimage *image,
    if (result < 0)
    goto out;

    - ptr = kmap(page);
    + ptr = kmap_thread(page);
    /* Start with a clear page */
    clear_page(ptr);
    ptr += maddr & ~PAGE_MASK;
    @@ -828,7 +828,7 @@ static int kimage_load_normal_segment(struct kimage *image,
    memcpy(ptr, kbuf, uchunk);
    else
    result = copy_from_user(ptr, buf, uchunk);
    - kunmap(page);
    + kunmap_thread(page);
    if (result) {
    result = -EFAULT;
    goto out;
    @@ -879,7 +879,7 @@ static int kimage_load_crash_segment(struct kimage *image,
    goto out;
    }
    arch_kexec_post_alloc_pages(page_address(page), 1, 0);
    - ptr = kmap(page);
    + ptr = kmap_thread(page);
    ptr += maddr & ~PAGE_MASK;
    mchunk = min_t(size_t, mbytes,
    PAGE_SIZE - (maddr & ~PAGE_MASK));
    @@ -895,7 +895,7 @@ static int kimage_load_crash_segment(struct kimage *image,
    else
    result = copy_from_user(ptr, buf, uchunk);
    kexec_flush_icache_page(page);
    - kunmap(page);
    + kunmap_thread(page);
    arch_kexec_pre_free_pages(page_address(page), 1);
    if (result) {
    result = -EFAULT;
    --
    2.28.0.rc0.12.gb6a658bd00c9
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