From: Christophe Leroy <christophe.leroy@c-s.fr>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>,
Michael Ellerman <mpe@ellerman.id.au>,
j.neuschaefer@gmx.net
Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org
Subject: [PATCH v1 11/13] powerpc/kconfig: define CONFIG_DATA_SHIFT and CONFIG_ETEXT_SHIFT
Date: Thu, 29 Nov 2018 19:00:32 +0000 (UTC) [thread overview]
Message-ID: <aa90e128e9822dc0f43f42941f339ae5edca9c63.1543517818.git.christophe.leroy@c-s.fr> (raw)
In-Reply-To: <cover.1543517818.git.christophe.leroy@c-s.fr>
CONFIG_STRICT_KERNEL_RWX requires a special alignment
for DATA for some subarches. Today it is just defined
as an #ifdef in vmlinux.lds.S
In order to get more flexibility, this patch moves the
definition of this alignment in Kconfig
On some subarches, CONFIG_STRICT_KERNEL_RWX will
require a special alignment of _etext.
This patch also adds a configuration item for it in Kconfig
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
---
arch/powerpc/Kconfig | 9 +++++++++
arch/powerpc/kernel/vmlinux.lds.S | 9 +++------
2 files changed, 12 insertions(+), 6 deletions(-)
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 4a81a80d0635..f3e420f3f1d7 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -728,6 +728,15 @@ config THREAD_SHIFT
Used to define the stack size. The default is almost always what you
want. Only change this if you know what you are doing.
+config ETEXT_SHIFT
+ int
+ default PPC_PAGE_SHIFT
+
+config DATA_SHIFT
+ int
+ default 24 if STRICT_KERNEL_RWX && PPC64
+ default PPC_PAGE_SHIFT
+
config FORCE_MAX_ZONEORDER
int "Maximum zone order"
range 8 9 if PPC64 && PPC_64K_PAGES
diff --git a/arch/powerpc/kernel/vmlinux.lds.S b/arch/powerpc/kernel/vmlinux.lds.S
index 1148c3c60c3b..d210dcfe915a 100644
--- a/arch/powerpc/kernel/vmlinux.lds.S
+++ b/arch/powerpc/kernel/vmlinux.lds.S
@@ -12,11 +12,8 @@
#include <asm/cache.h>
#include <asm/thread_info.h>
-#if defined(CONFIG_STRICT_KERNEL_RWX) && !defined(CONFIG_PPC32)
-#define STRICT_ALIGN_SIZE (1 << 24)
-#else
-#define STRICT_ALIGN_SIZE PAGE_SIZE
-#endif
+#define STRICT_ALIGN_SIZE (1 << CONFIG_DATA_SHIFT)
+#define ETEXT_ALIGN_SIZE (1 << CONFIG_ETEXT_SHIFT)
ENTRY(_stext)
@@ -131,7 +128,7 @@ SECTIONS
} :kernel
- . = ALIGN(PAGE_SIZE);
+ . = ALIGN(ETEXT_ALIGN_SIZE);
_etext = .;
PROVIDE32 (etext = .);
--
2.13.3
next prev parent reply other threads:[~2018-11-29 19:23 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-29 19:00 [PATCH v1 00/13] powerpc/32s: Use BATs for STRICT_KERNEL_RWX Christophe Leroy
2018-11-29 19:00 ` [PATCH v1 01/13] powerpc/mm: add exec protection on powerpc 603 Christophe Leroy
2018-11-29 19:00 ` [PATCH v1 02/13] powerpc/mm/32: add base address to mmu_mapin_ram() Christophe Leroy
2018-11-29 19:00 ` [PATCH v1 03/13] powerpc/mm/32s: rework mmu_mapin_ram() Christophe Leroy
2018-12-03 21:55 ` Jonathan Neuschäfer
2018-12-13 12:16 ` Christophe Leroy
2018-12-13 14:51 ` Christophe Leroy
2018-12-17 1:28 ` Jonathan Neuschäfer
2018-12-17 9:29 ` Christophe Leroy
2018-12-18 3:05 ` Jonathan Neuschäfer
2018-12-18 9:18 ` Christophe Leroy
2018-12-18 14:07 ` Jonathan Neuschäfer
2018-12-18 14:15 ` Christophe Leroy
2018-12-18 14:55 ` Christophe Leroy
2018-12-18 15:04 ` Christophe Leroy
2018-12-18 17:04 ` Jonathan Neuschäfer
2018-12-18 18:13 ` Christophe Leroy
2018-11-29 19:00 ` [PATCH v1 04/13] powerpc/mm/32s: use generic mmu_mapin_ram() for all blocks Christophe Leroy
2018-11-29 19:00 ` [PATCH v1 05/13] powerpc/wii: remove wii_mmu_mapin_mem2() Christophe Leroy
2018-11-29 19:00 ` [PATCH v1 06/13] powerpc/mm/32s: use _PAGE_EXEC in setbat() Christophe Leroy
2018-11-29 19:00 ` [PATCH v1 07/13] powerpc/mm/32s: add setibat() clearibat() and update_bats() Christophe Leroy
2018-11-29 19:00 ` [PATCH v1 08/13] powerpc/32: add helper to write into segment registers Christophe Leroy
2018-11-29 19:00 ` [PATCH v1 09/13] powerpc/mmu: add is_strict_kernel_rwx() helper Christophe Leroy
2018-11-29 19:00 ` [PATCH v1 10/13] powerpc/kconfig: define PAGE_SHIFT inside Kconfig Christophe Leroy
2018-11-29 19:00 ` Christophe Leroy [this message]
2018-11-29 19:00 ` [PATCH v1 12/13] powerpc/mm/32s: Use BATs for STRICT_KERNEL_RWX Christophe Leroy
2018-11-29 19:00 ` [PATCH v1 13/13] powerpc/kconfig: make _etext and data areas alignment configurable on Book3s 32 Christophe Leroy
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