From: William Lee Irwin III <wli@holomorphy.com>
To: akpm@zip.com.au
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: i386 pgd_index() doesn't parenthesize its arg
Date: Thu, 16 Jan 2003 21:51:28 -0800 [thread overview]
Message-ID: <20030117055128.GP919@holomorphy.com> (raw)
pgd_index() doesn't parenthesize its argument. This is a bad idea for
macros, since it's legitimate to pass expressions to them that will
get misinterpreted given operator precedence and the shift.
vs. 2.5.59
-- wli
===== include/asm-i386/pgtable.h 1.22 vs edited =====
--- 1.22/include/asm-i386/pgtable.h Mon Nov 25 14:41:15 2002
+++ edited/include/asm-i386/pgtable.h Thu Jan 16 21:08:06 2003
@@ -242,7 +242,7 @@
((pmd_val(pmd) & (_PAGE_PSE|_PAGE_PRESENT)) == (_PAGE_PSE|_PAGE_PRESENT))
/* to find an entry in a page-table-directory. */
-#define pgd_index(address) ((address >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
+#define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
#define __pgd_offset(address) pgd_index(address)
WARNING: multiple messages have this Message-ID (diff)
From: William Lee Irwin III <wli@holomorphy.com>
To: akpm@zip.com.au
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: i386 pgd_index() doesn't parenthesize its arg
Date: Thu, 16 Jan 2003 21:51:28 -0800 [thread overview]
Message-ID: <20030117055128.GP919@holomorphy.com> (raw)
pgd_index() doesn't parenthesize its argument. This is a bad idea for
macros, since it's legitimate to pass expressions to them that will
get misinterpreted given operator precedence and the shift.
vs. 2.5.59
-- wli
===== include/asm-i386/pgtable.h 1.22 vs edited =====
--- 1.22/include/asm-i386/pgtable.h Mon Nov 25 14:41:15 2002
+++ edited/include/asm-i386/pgtable.h Thu Jan 16 21:08:06 2003
@@ -242,7 +242,7 @@
((pmd_val(pmd) & (_PAGE_PSE|_PAGE_PRESENT)) == (_PAGE_PSE|_PAGE_PRESENT))
/* to find an entry in a page-table-directory. */
-#define pgd_index(address) ((address >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
+#define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
#define __pgd_offset(address) pgd_index(address)
--
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next reply other threads:[~2003-01-17 5:42 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-01-17 5:51 William Lee Irwin III [this message]
2003-01-17 5:51 ` i386 pgd_index() doesn't parenthesize its arg William Lee Irwin III
2003-01-17 6:03 ` William Lee Irwin III
2003-01-17 6:03 ` William Lee Irwin III
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