Merge tag 'powerpc-6.3-3' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc...

Pull powerpc fixes from Michael Ellerman:

 - Fix false detection of read faults, introduced by execute-only
   support

 - Fix a build failure when GENERIC_ALLOCATOR is not selected

Thanks to Russell Currey, Randy Dunlap, Michal Suchánek, Nathan Lynch,
and Benjamin Gray.

* tag 'powerpc-6.3-3' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
  powerpc/mm: Fix false detection of read faults
  powerpc/pseries: RTAS work area requires GENERIC_ALLOCATOR

diff --git a/arch/powerpc/mm/fault.c b/arch/powerpc/mm/fault.c
index 2bef19c..af46aa8 100644 (file)
--- a/arch/powerpc/mm/fault.c
+++ b/arch/powerpc/mm/fault.c
@@ -271,11 +271,16 @@ static bool access_error(bool is_write, bool is_exec, struct vm_area_struct *vma
        }
 
        /*
-        * Check for a read fault.  This could be caused by a read on an
-        * inaccessible page (i.e. PROT_NONE), or a Radix MMU execute-only page.
+        * VM_READ, VM_WRITE and VM_EXEC all imply read permissions, as
+        * defined in protection_map[].  Read faults can only be caused by
+        * a PROT_NONE mapping, or with a PROT_EXEC-only mapping on Radix.
         */
-       if (unlikely(!(vma->vm_flags & VM_READ)))
+       if (unlikely(!vma_is_accessible(vma)))
                return true;
+
+       if (unlikely(radix_enabled() && ((vma->vm_flags & VM_ACCESS_FLAGS) == VM_EXEC)))
+               return true;
+
        /*
         * We should ideally do the vma pkey access check here. But in the
         * fault path, handle_mm_fault() also does the same check. To avoid

diff --git a/arch/powerpc/platforms/pseries/Kconfig b/arch/powerpc/platforms/pseries/Kconfig
index b481c5c..21b22bf 100644 (file)
--- a/arch/powerpc/platforms/pseries/Kconfig
+++ b/arch/powerpc/platforms/pseries/Kconfig
@@ -7,6 +7,7 @@ config PPC_PSERIES
        select OF_DYNAMIC
        select FORCE_PCI
        select PCI_MSI
+       select GENERIC_ALLOCATOR
        select PPC_XICS
        select PPC_XIVE_SPAPR
        select PPC_ICP_NATIVE