[Xen-devel] [PATCH 01/10] remove dead code in pgtable_cache_init

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

The conversion from using a slab cache to quicklist left some residual
dead code.

I note that in the conversion it now always allocates a whole page for
the pgd, rather than the 32 bytes needed for a PAE pgd.  Was this
intended?

Signed-off-by: Jeremy Fitzhardinge <jeremy@xxxxxxxxxxxxx>
Cc: Christoph Lameter <clameter@xxxxxxx>
Cc: Andi Kleen <ak@xxxxxxx>
Cc: William Lee Irwin III <wli@xxxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>

---
 arch/i386/mm/init.c |   22 +++++-----------------
 1 file changed, 5 insertions(+), 17 deletions(-)

===================================================================
--- a/arch/i386/mm/init.c
+++ b/arch/i386/mm/init.c
@@ -746,24 +746,12 @@ struct kmem_cache *pmd_cache;
 
 void __init pgtable_cache_init(void)
 {
-       size_t pgd_size = PTRS_PER_PGD*sizeof(pgd_t);
-
-       if (PTRS_PER_PMD > 1) {
+       if (PTRS_PER_PMD > 1)
                pmd_cache = kmem_cache_create("pmd",
-                                       PTRS_PER_PMD*sizeof(pmd_t),
-                                       PTRS_PER_PMD*sizeof(pmd_t),
-                                       SLAB_PANIC,
-                                       pmd_ctor);
-               if (!SHARED_KERNEL_PMD) {
-                       /* If we're in PAE mode and have a non-shared
-                          kernel pmd, then the pgd size must be a
-                          page size.  This is because the pgd_list
-                          links through the page structure, so there
-                          can only be one pgd per page for this to
-                          work. */
-                       pgd_size = PAGE_SIZE;
-               }
-       }
+                                             PTRS_PER_PMD*sizeof(pmd_t),
+                                             PTRS_PER_PMD*sizeof(pmd_t),
+                                             SLAB_PANIC,
+                                             pmd_ctor);
 }
 
 /*

-- 


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