x86/mm/iommu/sva: Fix error code for LAM enabling failure due to SVA

Normally, LAM and SVA are mutually exclusive. LAM enabling will fail if
SVA is already in use.

Correct error code for the failure. EINTR is nonsensical there.

Fixes: 23e5d9ec2bab ("x86/mm/iommu/sva: Make LAM and SVA mutually exclusive")
Reported-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
Link: https://lore.kernel.org/all/CACT4Y+YfqSMsZArhh25TESmG-U4jO5Hjphz87wKSnTiaw2Wrfw@mail.gmail.com
Link: https://lore.kernel.org/all/20230403111020.3136-2-kirill.shutemov%40linux.intel.com

diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index b46924c..bc2ac56 100644 (file)
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -758,7 +758,7 @@ static int prctl_enable_tagged_addr(struct mm_struct *mm, unsigned long nr_bits)
 
        if (mm_valid_pasid(mm) &&
            !test_bit(MM_CONTEXT_FORCE_TAGGED_SVA, &mm->context.flags))
-               return -EINTR;
+               return -EINVAL;
 
        if (mmap_write_lock_killable(mm))
                return -EINTR;