s390/pgtable: Switch read and write softbits for puds

JIRA: https://issues.redhat.com/browse/RHEL-74362
Tested: by me

commit 3e93d49
Author: Claudio Imbrenda <imbrenda@linux.ibm.com>
Date:   Mon Apr 29 16:34:08 2024 +0200

    s390/pgtable: Switch read and write softbits for puds

    There is no reason for the read and write softbits to be swapped in the
    puds compared to pmds. They are different only because the softbits for
    puds were introduced at the same time when the softbits for pmds were
    swapped.

    The current implementation is not wrong per se, since the macros are
    defined correctly; only the documentation does not reflect reality.

    With this patch, the read and write softbits for large pmd and large
    puds will have the same layout, and will match the existing
    documentation.

    Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
    Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
    Link: https://lore.kernel.org/r/20240429143409.49892-2-imbrenda@linux.ibm.com
    Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>

Signed-off-by: Aristeu Rozanski <arozansk@redhat.com>

Author: aristeu

arch/s390/include/asm/pgtable.h

@@ -266,8 +266,8 @@ static inline int is_module_addr(void *addr)
 #define _REGION3_ENTRY_DIRTY	0x2000	/* SW region dirty bit */
 #define _REGION3_ENTRY_YOUNG	0x1000	/* SW region young bit */
 #define _REGION3_ENTRY_LARGE	0x0400	/* RTTE-format control, large page  */
-#define _REGION3_ENTRY_READ	0x0002	/* SW region read bit */
-#define _REGION3_ENTRY_WRITE	0x0001	/* SW region write bit */
+#define _REGION3_ENTRY_WRITE	0x0002	/* SW region write bit */
+#define _REGION3_ENTRY_READ	0x0001	/* SW region read bit */
 
 #ifdef CONFIG_MEM_SOFT_DIRTY
 #define _REGION3_ENTRY_SOFT_DIRTY 0x4000 /* SW region soft dirty bit */