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sections: disable const sections for PA-RISC v2 

The PA-RISC tool chain seems to have some problem with correct
read/write attributes on sections.  This causes problems when the const
sections are fixed up for other architecture to only contain truly
read-only data.

Disable const sections for PA-RISC

This can cause a bit of noise with modpost.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Cc: "James E.J. Bottomley" <jejb@parisc-linux.org>
Cc: Helge Deller <deller@gmx.de>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andi Kleen 2012-10-04 17:11:27 -07:00 committed by Linus Torvalds
parent 0f6d93aa9d
commit 754b7b63d1
3 changed files with 26 additions and 8 deletions
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1
arch/parisc/Kconfig
View File

@ -13,6 +13,7 @@ config PARISC
select HAVE_PERF_EVENTS
select GENERIC_ATOMIC64 if !64BIT
select HAVE_GENERIC_HARDIRQS
select BROKEN_RODATA
select GENERIC_IRQ_PROBE
select GENERIC_PCI_IOMAP
select IRQ_PER_CPU

27
include/linux/init.h
View File

@ -43,10 +43,21 @@
discard it in modules) */
#define __init __section(.init.text) __cold notrace
#define __initdata __section(.init.data)
#define __initconst __section(.init.rodata)
#define __initconst __constsection(.init.rodata)
#define __exitdata __section(.exit.data)
#define __exit_call __used __section(.exitcall.exit)
/*
* Some architecture have tool chains which do not handle rodata attributes
* correctly. For those disable special sections for const, so that other
* architectures can annotate correctly.
*/
#ifdef CONFIG_BROKEN_RODATA
#define __constsection(x)
#else
#define __constsection(x) __section(x)
#endif
/*
* modpost check for section mismatches during the kernel build.
* A section mismatch happens when there are references from a
@ -66,7 +77,7 @@
*/
#define __ref __section(.ref.text) noinline
#define __refdata __section(.ref.data)
#define __refconst __section(.ref.rodata)
#define __refconst __constsection(.ref.rodata)
/* compatibility defines */
#define __init_refok __ref
@ -85,26 +96,26 @@
/* Used for HOTPLUG */
#define __devinit __section(.devinit.text) __cold notrace
#define __devinitdata __section(.devinit.data)
#define __devinitconst __section(.devinit.rodata)
#define __devinitconst __constsection(.devinit.rodata)
#define __devexit __section(.devexit.text) __exitused __cold notrace
#define __devexitdata __section(.devexit.data)
#define __devexitconst __section(.devexit.rodata)
#define __devexitconst __constsection(.devexit.rodata)
/* Used for HOTPLUG_CPU */
#define __cpuinit __section(.cpuinit.text) __cold notrace
#define __cpuinitdata __section(.cpuinit.data)
#define __cpuinitconst __section(.cpuinit.rodata)
#define __cpuinitconst __constsection(.cpuinit.rodata)
#define __cpuexit __section(.cpuexit.text) __exitused __cold notrace
#define __cpuexitdata __section(.cpuexit.data)
#define __cpuexitconst __section(.cpuexit.rodata)
#define __cpuexitconst __constsection(.cpuexit.rodata)
/* Used for MEMORY_HOTPLUG */
#define __meminit __section(.meminit.text) __cold notrace
#define __meminitdata __section(.meminit.data)
#define __meminitconst __section(.meminit.rodata)
#define __meminitconst __constsection(.meminit.rodata)
#define __memexit __section(.memexit.text) __exitused __cold notrace
#define __memexitdata __section(.memexit.data)
#define __memexitconst __section(.memexit.rodata)
#define __memexitconst __constsection(.memexit.rodata)
/* For assembly routines */
#define __HEAD .section ".head.text","ax"

6
init/Kconfig
View File

@ -1581,4 +1581,10 @@ config PADATA
depends on SMP
bool
# Can be selected by architectures with broken toolchains
# that get confused by correct const<->read_only section
# mappings
config BROKEN_RODATA
bool
source "kernel/Kconfig.locks"