[PARISC] Ensure Space ID hashing is turned off

Check PDC_CACHE to see if spaceid hashing is turned on, and fail to
boot if that is the case.

However, some old machines do not implement the PDC_CACHE_RET_SPID
firmware call, so continue to boot if the call fails because of
PDC_BAD_OPTION (but fail in all other error returns).

Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>

1 files changed, 9 insertions, 1 deletions

diff --git a/arch/parisc/kernel/cache.c b/arch/parisc/kernel/cache.c
index 851519cbad6f..bc7c4a4e26a1 100644
--- a/arch/parisc/kernel/cache.c
+++ b/arch/parisc/kernel/cache.c
@@ -236,7 +236,8 @@ parisc_cache_init(void)
 
 void disable_sr_hashing(void)
 {
-        int srhash_type;
+        int srhash_type, retval;
+        unsigned long space_bits;
 
         switch (boot_cpu_data.cpu_type) {
         case pcx: /* We shouldn't get this far.  setup.c should prevent it. */
@@ -262,6 +263,13 @@ void disable_sr_hashing(void)
         }
 
         disable_sr_hashing_asm(srhash_type);
+
+        retval = pdc_spaceid_bits(&space_bits);
+        /* If this procedure isn't implemented, don't panic. */
+        if (retval < 0 && retval != PDC_BAD_OPTION)
+                panic("pdc_spaceid_bits call failed.\n");
+        if (space_bits != 0)
+                panic("SpaceID hashing is still on!\n");
 }
 
 void flush_dcache_page(struct page *page)