[PATCH RFC PKS/PMEM 51/58] kernel: Utilize new kmap_thread()

[ira.weiny@xxxxxxxxx]

From: Ira Weiny <ira.weiny@xxxxxxxxx>

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@xxxxxxxxxxxx>
Signed-off-by: Ira Weiny <ira.weiny@xxxxxxxxx>
---
 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