From: Seth Jennings <sjenning@linux.vnet.ibm.com>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Seth Jennings <sjenning@linux.vnet.ibm.com>,
Dan Magenheimer <dan.magenheimer@oracle.com>,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
Nitin Gupta <ngupta@vflare.org>,
Robert Jennings <rcj@linux.vnet.ibm.com>,
devel@driverdev.osuosl.org, linux-kernel@vger.kernel.org,
linux-mm@kvack.org
Subject: [PATCH 4/5] staging: zsmalloc: change ZS_MIN_ALLOC_SIZE
Date: Mon, 5 Mar 2012 11:33:23 -0600 [thread overview]
Message-ID: <1330968804-8098-5-git-send-email-sjenning@linux.vnet.ibm.com> (raw)
In-Reply-To: <1330968804-8098-1-git-send-email-sjenning@linux.vnet.ibm.com>
This patch ensures that the value of ZS_MIN_ALLOC_SIZE, for the
PAGE_SIZE and MAX_PHYSMEM_BITS on the system, allows for all
possible object ids in the lowest storage class to be encoded
in the object handle.
Signed-off-by: Seth Jennings <sjenning@linux.vnet.ibm.com>
---
drivers/staging/zsmalloc/zsmalloc_int.h | 4 +++-
1 files changed, 3 insertions(+), 1 deletions(-)
diff --git a/drivers/staging/zsmalloc/zsmalloc_int.h b/drivers/staging/zsmalloc/zsmalloc_int.h
index ffb272f..92eefc6 100644
--- a/drivers/staging/zsmalloc/zsmalloc_int.h
+++ b/drivers/staging/zsmalloc/zsmalloc_int.h
@@ -58,8 +58,10 @@
#define OBJ_INDEX_BITS (BITS_PER_LONG - _PFN_BITS)
#define OBJ_INDEX_MASK ((_AC(1, UL) << OBJ_INDEX_BITS) - 1)
+#define MAX(a, b) ((a) >= (b) ? (a) : (b))
/* ZS_MIN_ALLOC_SIZE must be multiple of ZS_ALIGN */
-#define ZS_MIN_ALLOC_SIZE 32
+#define ZS_MIN_ALLOC_SIZE \
+ MAX(32, (ZS_MAX_PAGES_PER_ZSPAGE << PAGE_SHIFT >> OBJ_INDEX_BITS))
#define ZS_MAX_ALLOC_SIZE PAGE_SIZE
/*
--
1.7.5.4
next prev parent reply other threads:[~2012-03-05 17:34 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-05 17:33 [PATCH 0/5] staging: zsmalloc: remove SPARSEMEM dependency Seth Jennings
2012-03-05 17:33 ` [PATCH 1/5] staging: zsmalloc: move object/handle masking defines Seth Jennings
2012-03-05 17:33 ` [PATCH 2/5] staging: zsmalloc: add ZS_MAX_PAGES_PER_ZSPAGE Seth Jennings
2012-03-05 17:33 ` [PATCH 3/5] staging: zsmalloc: calculate MAX_PHYSMEM_BITS if not defined Seth Jennings
2012-03-05 17:33 ` Seth Jennings [this message]
2012-03-05 17:33 ` [PATCH 5/5] staging: zsmalloc: remove SPARSEMEM dep from Kconfig Seth Jennings
2012-03-05 18:07 ` [PATCH 0/5] staging: zsmalloc: remove SPARSEMEM dependency Nitin Gupta
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