parisc: Update comments in syscall.S regarding wide userland
We do support running 64-bit userspace processes, although there isn't
yet full gcc and glibc support. Anyway, fix the comments to reflect the
reality.
Signed-off-by: Helge Deller <deller@gmx.de>
diff --git a/arch/parisc/kernel/syscall.S b/arch/parisc/kernel/syscall.S
index be45176..f453997 100644
--- a/arch/parisc/kernel/syscall.S
+++ b/arch/parisc/kernel/syscall.S
@@ -108,12 +108,8 @@
mtsp %r0,%sr6 /* get kernel space into sr6 */
#ifdef CONFIG_64BIT
- /* for now we can *always* set the W bit on entry to the syscall
- * since we don't support wide userland processes. We could
- * also save the current SM other than in r0 and restore it on
- * exit from the syscall, and also use that value to know
- * whether to do narrow or wide syscalls. -PB
- */
+ /* Store W bit on entry to the syscall in case it's a wide userland
+ * process. */
ssm PSW_SM_W, %r1
extrd,u %r1,PSW_W_BIT,1,%r1
/* sp must be aligned on 4, so deposit the W bit setting into
@@ -478,16 +474,13 @@
lws_start:
#ifdef CONFIG_64BIT
- /* FIXME: If we are a 64-bit kernel just
- * turn this on unconditionally.
- */
ssm PSW_SM_W, %r1
extrd,u %r1,PSW_W_BIT,1,%r1
/* sp must be aligned on 4, so deposit the W bit setting into
* the bottom of sp temporarily */
or,ev %r1,%r30,%r30
- /* Clip LWS number to a 32-bit value always */
+ /* Clip LWS number to a 32-bit value for 32-bit processes */
depdi 0, 31, 32, %r20
#endif