s390/checksum: provide and use cksm() inline assembly

Convert those callers of csum_partial() to use the cksm instruction,
which are either very early or in critical paths, like panic/dump, so
they don't have to rely on a working kernel infrastructure, which will
be introduced with a subsequent patch.

Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/arch/s390/kernel/os_info.c b/arch/s390/kernel/os_info.c
index 6e1824141b29..a801e6bd5341 100644
--- a/arch/s390/kernel/os_info.c
+++ b/arch/s390/kernel/os_info.c
@@ -29,7 +29,7 @@ static struct os_info os_info __page_aligned_data;
 u32 os_info_csum(struct os_info *os_info)
 {
 	int size = sizeof(*os_info) - offsetof(struct os_info, version_major);
-	return (__force u32)csum_partial(&os_info->version_major, size, 0);
+	return (__force u32)cksm(&os_info->version_major, size, 0);
 }
 
 /*
@@ -49,7 +49,7 @@ void os_info_entry_add(int nr, void *ptr, u64 size)
 {
 	os_info.entry[nr].addr = __pa(ptr);
 	os_info.entry[nr].size = size;
-	os_info.entry[nr].csum = (__force u32)csum_partial(ptr, size, 0);
+	os_info.entry[nr].csum = (__force u32)cksm(ptr, size, 0);
 	os_info.csum = os_info_csum(&os_info);
 }
 
@@ -98,7 +98,7 @@ static void os_info_old_alloc(int nr, int align)
 		msg = "copy failed";
 		goto fail_free;
 	}
-	csum = (__force u32)csum_partial(buf_align, size, 0);
+	csum = (__force u32)cksm(buf_align, size, 0);
 	if (csum != os_info_old->entry[nr].csum) {
 		msg = "checksum failed";
 		goto fail_free;