powerpc/mm: Cleanup handling of execute permission

This is an attempt at cleaning up a bit the way we handle execute
permission on powerpc. _PAGE_HWEXEC is gone, _PAGE_EXEC is now only
defined by CPUs that can do something with it, and the myriad of
#ifdef's in the I$/D$ coherency code is reduced to 2 cases that
hopefully should cover everything.

The logic on BookE is a little bit different than what it was though
not by much. Since now, _PAGE_EXEC will be set by the generic code
for executable pages, we need to filter out if they are unclean and
recover it. However, I don't expect the code to be more bloated than
it already was in that area due to that change.

I could boast that this brings proper enforcing of per-page execute
permissions to all BookE and 40x but in fact, we've had that now for
some time as a side effect of my previous rework in that area (and
I didn't even know it :-) We would only enable execute permission if
the page was cache clean and we would only cache clean it if we took
and exec fault. Since we now enforce that the later only work if
VM_EXEC is part of the VMA flags, we de-fact already enforce per-page
execute permissions... Unless I missed something

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/arch/powerpc/kernel/head_fsl_booke.S b/arch/powerpc/kernel/head_fsl_booke.S
index eca80482ae7..2c5af525647 100644
--- a/arch/powerpc/kernel/head_fsl_booke.S
+++ b/arch/powerpc/kernel/head_fsl_booke.S
@@ -643,7 +643,7 @@ interrupt_base:
 
 4:
         /* Make up the required permissions */
-        li      r13,_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_HWEXEC
+        li      r13,_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_EXEC
 
         FIND_PTE
         andc.   r13,r13,r11             /* Check permission */
@@ -742,7 +742,7 @@ finish_tlb_load:
 #endif
         mtspr   SPRN_MAS2, r12
 
-        li      r10, (_PAGE_HWEXEC | _PAGE_PRESENT)
+        li      r10, (_PAGE_EXEC | _PAGE_PRESENT)
         rlwimi  r10, r11, 31, 29, 29    /* extract _PAGE_DIRTY into SW */
         and     r12, r11, r10
         andi.   r10, r11, _PAGE_USER    /* Test for _PAGE_USER */