linux-kernel - [PATCH] i386: remove dead code in pgtable_cache

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Date:	Wed, 10 Oct 2007 13:38:30 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Christoph Lameter <clameter@....com>
CC:	Andi Kleen <ak@...e.de>,
	William Lee Irwin III <wli@...omorphy.com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [PATCH] i386:  remove dead code in pgtable_cache_init

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@...source.com>
Cc: Christoph Lameter <clameter@....com>
Cc: Andi Kleen <ak@...e.de>
Cc: William Lee Irwin III <wli@...omorphy.com>
Cc: Ingo Molnar <mingo@...e.hu>
Cc: Thomas Gleixner <tglx@...utronix.de>

---
 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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