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SubjectRe: [PATCH RFC PKS/PMEM 51/58] kernel: Utilize new kmap_thread()
ira.weiny@intel.com writes:

> 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.

Acked-by: "Eric W. Biederman" <ebiederm@xmission.com>

>
> 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;

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