[PARISC] fix TLB fault path on PA2.0 narrow systems

commit 5e185581d7c46ddd33cd9c01106d1fc86efb9376
Author: James Bottomley <JBottomley@Parallels.com>

    [PARISC] fix PA1.1 oops on boot

Didn't quite fix the crash on boot.  It moved it from PA1.1 processors to
PA2.0 narrow kernels.  The final fix is to make sure the [id]tlb_miss_20 paths
also work.  Even on narrow systems, these paths require using the wide
instructions becuase the tlb insertion format is wide.  Fix this by
conditioning the dep[wd],z on whether we're being called from _11 or _20[w]
paths.

Tested-by: Helge Deller <deller@gmx.de>
Cc: stable@vger.kernel.org
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

diff --git a/arch/parisc/kernel/entry.S b/arch/parisc/kernel/entry.S
index 5350342170218f635e4e231a4d10b1147210a1bf..07ef351edd57da0b4fe576a6eed02026b148e890 100644 (file)
--- a/arch/parisc/kernel/entry.S
+++ b/arch/parisc/kernel/entry.S
@@ -552,7 +552,7 @@
         * entry (identifying the physical page) and %r23 up with
         * the from tlb entry (or nothing if only a to entry---for
         * clear_user_page_asm) */
-       .macro          do_alias        spc,tmp,tmp1,va,pte,prot,fault
+       .macro          do_alias        spc,tmp,tmp1,va,pte,prot,fault,patype
        cmpib,COND(<>),n 0,\spc,\fault
        ldil            L%(TMPALIAS_MAP_START),\tmp
 #if defined(CONFIG_64BIT) && (TMPALIAS_MAP_START >= 0x80000000)
@@ -581,11 +581,15 @@
         */
        cmpiclr,=       0x01,\tmp,%r0
        ldi             (_PAGE_DIRTY|_PAGE_READ|_PAGE_WRITE),\prot
-#ifdef CONFIG_64BIT
+.ifc \patype,20
        depd,z          \prot,8,7,\prot
-#else
+.else
+.ifc \patype,11
        depw,z          \prot,8,7,\prot
-#endif
+.else
+       .error "undefined PA type to do_alias"
+.endif
+.endif
        /*
         * OK, it is in the temp alias region, check whether "from" or "to".
         * Check "subtle" note in pacache.S re: r23/r26.
@@ -1189,7 +1193,7 @@ dtlb_miss_20w:
        nop
 
 dtlb_check_alias_20w:
-       do_alias        spc,t0,t1,va,pte,prot,dtlb_fault
+       do_alias        spc,t0,t1,va,pte,prot,dtlb_fault,20
 
        idtlbt          pte,prot
 
@@ -1213,7 +1217,7 @@ nadtlb_miss_20w:
        nop
 
 nadtlb_check_alias_20w:
-       do_alias        spc,t0,t1,va,pte,prot,nadtlb_emulate
+       do_alias        spc,t0,t1,va,pte,prot,nadtlb_emulate,20
 
        idtlbt          pte,prot
 
@@ -1245,7 +1249,7 @@ dtlb_miss_11:
        nop
 
 dtlb_check_alias_11:
-       do_alias        spc,t0,t1,va,pte,prot,dtlb_fault
+       do_alias        spc,t0,t1,va,pte,prot,dtlb_fault,11
 
        idtlba          pte,(va)
        idtlbp          prot,(va)
@@ -1277,7 +1281,7 @@ nadtlb_miss_11:
        nop
 
 nadtlb_check_alias_11:
-       do_alias        spc,t0,t1,va,pte,prot,nadtlb_emulate
+       do_alias        spc,t0,t1,va,pte,prot,nadtlb_emulate,11
 
        idtlba          pte,(va)
        idtlbp          prot,(va)
@@ -1304,7 +1308,7 @@ dtlb_miss_20:
        nop
 
 dtlb_check_alias_20:
-       do_alias        spc,t0,t1,va,pte,prot,dtlb_fault
+       do_alias        spc,t0,t1,va,pte,prot,dtlb_fault,20
        
        idtlbt          pte,prot
 
@@ -1330,7 +1334,7 @@ nadtlb_miss_20:
        nop
 
 nadtlb_check_alias_20:
-       do_alias        spc,t0,t1,va,pte,prot,nadtlb_emulate
+       do_alias        spc,t0,t1,va,pte,prot,nadtlb_emulate,20
 
        idtlbt          pte,prot
 
@@ -1457,7 +1461,7 @@ naitlb_miss_20w:
        nop
 
 naitlb_check_alias_20w:
-       do_alias        spc,t0,t1,va,pte,prot,naitlb_fault
+       do_alias        spc,t0,t1,va,pte,prot,naitlb_fault,20
 
        iitlbt          pte,prot
 
@@ -1511,7 +1515,7 @@ naitlb_miss_11:
        nop
 
 naitlb_check_alias_11:
-       do_alias        spc,t0,t1,va,pte,prot,itlb_fault
+       do_alias        spc,t0,t1,va,pte,prot,itlb_fault,11
 
        iitlba          pte,(%sr0, va)
        iitlbp          prot,(%sr0, va)
@@ -1557,7 +1561,7 @@ naitlb_miss_20:
        nop
 
 naitlb_check_alias_20:
-       do_alias        spc,t0,t1,va,pte,prot,naitlb_fault
+       do_alias        spc,t0,t1,va,pte,prot,naitlb_fault,20
 
        iitlbt          pte,prot