KVM: s390: rename PROT_NONE to PROT_TYPE_DUMMY

JIRA: https://issues.redhat.com/browse/RHEL-113452

commit 15ac613
Author: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Date:   Mon May 19 15:56:57 2025 +0100

    KVM: s390: rename PROT_NONE to PROT_TYPE_DUMMY

    The enum type prot_type declared in arch/s390/kvm/gaccess.c declares an
    unfortunate identifier within it - PROT_NONE.

    This clashes with the protection bit define from the uapi for mmap()
    declared in include/uapi/asm-generic/mman-common.h, which is indeed what
    those casually reading this code would assume this to refer to.

    This means that any changes which subsequently alter headers in any way
    which results in the uapi header being imported here will cause build
    errors.

    Resolve the issue by renaming PROT_NONE to PROT_TYPE_DUMMY.

    Link: https://lkml.kernel.org/r/20250519145657.178365-1-lorenzo.stoakes@oracle.com
    Fixes: b3cefd6 ("KVM: s390: Pass initialized arg even if unused")
    Signed-off-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
    Suggested-by: Ignacio Moreno Gonzalez <Ignacio.MorenoGonzalez@kuka.com>
    Reported-by: kernel test robot <lkp@intel.com>
    Closes: https://lore.kernel.org/oe-kbuild-all/202505140943.IgHDa9s7-lkp@intel.com/
    Acked-by: Christian Borntraeger <borntraeger@linux.ibm.com>
    Acked-by: Ignacio Moreno Gonzalez <Ignacio.MorenoGonzalez@kuka.com>
    Acked-by: Yang Shi <yang@os.amperecomputing.com>
    Reviewed-by: David Hildenbrand <david@redhat.com>
    Acked-by: Liam R. Howlett <Liam.Howlett@oracle.com>
    Reviewed-by: Oscar Salvador <osalvador@suse.de>
    Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
    Cc: <stable@vger.kernel.org>
    Cc: Alexander Gordeev <agordeev@linux.ibm.com>
    Cc: Heiko Carstens <hca@linux.ibm.com>
    Cc: James Houghton <jthoughton@google.com>
    Cc: Janosch Frank <frankja@linux.ibm.com>
    Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
    Cc: Paolo Bonzini <pbonzini@redhat.com>
    Cc: Sven Schnelle <svens@linux.ibm.com>
    Cc: Vasily Gorbik <gor@linux.ibm.com>
    Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

Signed-off-by: Thomas Huth <thuth@redhat.com>

Author: huth

arch/s390/kvm/gaccess.c

@@ -317,7 +317,7 @@ enum prot_type {
 	PROT_TYPE_DAT  = 3,
 	PROT_TYPE_IEP  = 4,
 	/* Dummy value for passing an initialized value when code != PGM_PROTECTION */
-	PROT_NONE,
+	PROT_TYPE_DUMMY,
 };
 
 static int trans_exc_ending(struct kvm_vcpu *vcpu, int code, unsigned long gva, u8 ar,
@@ -333,7 +333,7 @@ static int trans_exc_ending(struct kvm_vcpu *vcpu, int code, unsigned long gva,
 	switch (code) {
 	case PGM_PROTECTION:
 		switch (prot) {
-		case PROT_NONE:
+		case PROT_TYPE_DUMMY:
 			/* We should never get here, acts like termination */
 			WARN_ON_ONCE(1);
 			break;
@@ -803,7 +803,7 @@ static int guest_range_to_gpas(struct kvm_vcpu *vcpu, unsigned long ga, u8 ar,
 			gpa = kvm_s390_real_to_abs(vcpu, ga);
 			if (!kvm_is_gpa_in_memslot(vcpu->kvm, gpa)) {
 				rc = PGM_ADDRESSING;
-				prot = PROT_NONE;
+				prot = PROT_TYPE_DUMMY;
 			}
 		}
 		if (rc)
@@ -961,7 +961,7 @@ int access_guest_with_key(struct kvm_vcpu *vcpu, unsigned long ga, u8 ar,
 		if (rc == PGM_PROTECTION)
 			prot = PROT_TYPE_KEYC;
 		else
-			prot = PROT_NONE;
+			prot = PROT_TYPE_DUMMY;
 		rc = trans_exc_ending(vcpu, rc, ga, ar, mode, prot, terminate);
 	}
 out_unlock: