diff mbox

[01/30] asm-generic: add .data.rel.ro sections to __ro_after_init

Message ID 20170814125411.22604-2-ard.biesheuvel@linaro.org
State New, archived
Headers show

Commit Message

Ard Biesheuvel Aug. 14, 2017, 12:53 p.m. UTC
When running in PIC mode, the compiler will emit const structures
containing runtime relocatable quantities into .data.rel.ro.* sections,
so that the linker can be smart about placing them together in a segment
that is read-write initially, and is remapped read-only afterwards. This
is exactly what __ro_after_init aims to provide, so move these sections
together.

Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
---
 include/asm-generic/vmlinux.lds.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Comments

Arnd Bergmann Aug. 14, 2017, 2:26 p.m. UTC | #1
On Mon, Aug 14, 2017 at 2:53 PM, Ard Biesheuvel
<ard.biesheuvel@linaro.org> wrote:
> When running in PIC mode, the compiler will emit const structures
> containing runtime relocatable quantities into .data.rel.ro.* sections,
> so that the linker can be smart about placing them together in a segment
> that is read-write initially, and is remapped read-only afterwards. This
> is exactly what __ro_after_init aims to provide, so move these sections
> together.
>
> Cc: Arnd Bergmann <arnd@arndb.de>
> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>

Acked-by: Arnd Bergmann <arnd@arndb.de>
diff mbox

Patch

diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
index da0be9a8d1de..d16537b0b102 100644
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -261,7 +261,7 @@ 
 #ifndef RO_AFTER_INIT_DATA
 #define RO_AFTER_INIT_DATA						\
 	VMLINUX_SYMBOL(__start_ro_after_init) = .;			\
-	*(.data..ro_after_init)						\
+	*(.data..ro_after_init .data.rel.ro.*)				\
 	VMLINUX_SYMBOL(__end_ro_after_init) = .;
 #endif