6.6-stable review patch. If anyone has any objections, please let me know.
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From: Lorenzo Stoakes lorenzo.stoakes@oracle.com
commit 15ac613f124e51a6623975efad9657b1f3ee47e7 upstream.
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: b3cefd6bf16e ("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: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/s390/kvm/gaccess.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-)
--- a/arch/s390/kvm/gaccess.c +++ b/arch/s390/kvm/gaccess.c @@ -490,7 +490,7 @@ 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, @@ -506,7 +506,7 @@ static int trans_exc_ending(struct kvm_v 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; @@ -976,7 +976,7 @@ static int guest_range_to_gpas(struct kv gpa = kvm_s390_real_to_abs(vcpu, ga); if (kvm_is_error_gpa(vcpu->kvm, gpa)) { rc = PGM_ADDRESSING; - prot = PROT_NONE; + prot = PROT_TYPE_DUMMY; } } if (rc) @@ -1134,7 +1134,7 @@ int access_guest_with_key(struct kvm_vcp 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: