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Commit bf14e3b9 authored by Vineet Gupta's avatar Vineet Gupta
Browse files

sysctl: Enable PARISC "unaligned-trap" to be used cross-arch 



PARISC defines /proc/sys/kernel/unaligned-trap to runtime toggle
unaligned access emulation.

The exact mechanics of enablig/disabling are still arch specific, we can
make the sysctl usable by other arches.

Signed-off-by: default avatarVineet Gupta <vgupta@synopsys.com>
Acked-by: default avatarHelge Deller <deller@gmx.de>
Cc: "James E.J. Bottomley" <jejb@parisc-linux.org>
Cc: Helge Deller <deller@gmx.de>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Serge Hallyn <serge.hallyn@canonical.com>
parent 4d86dfbb

arch/parisc/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -20,6 +20,7 @@ config PARISC 
	select ARCH_HAVE_NMI_SAFE_CMPXCHG

	select GENERIC_SMP_IDLE_THREAD

	select GENERIC_STRNCPY_FROM_USER

	select SYSCTL_ARCH_UNALIGN_ALLOW

	select HAVE_MOD_ARCH_SPECIFIC

	select MODULES_USE_ELF_RELA

	select CLONE_BACKWARDS

init/Kconfig

+8 −0
Original line number Diff line number Diff line
@@ -1232,6 +1232,14 @@ config SYSCTL_EXCEPTION_TRACE 
	help

	  Enable support for /proc/sys/debug/exception-trace.



config SYSCTL_ARCH_UNALIGN_ALLOW

	bool

	help

	  Enable support for /proc/sys/kernel/unaligned-trap

	  Allows arches to define/use @unaligned_enabled to runtime toggle

	  the unaligned access emulation.

	  see arch/parisc/kernel/unaligned.c for reference



config KALLSYMS

	 bool "Load all symbols for debugging/ksymoops" if EXPERT

	 default y

kernel/sysctl.c

+5 −0
Original line number Diff line number Diff line
@@ -157,6 +157,9 @@ extern int sysctl_tsb_ratio; 


#ifdef __hppa__

extern int pwrsw_enabled;

#endif



#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW

extern int unaligned_enabled;

#endif
@@ -545,6 +548,8 @@ static struct ctl_table kern_table[] = { 
	 	.mode		= 0644,

		.proc_handler	= proc_dointvec,

	},

#endif

#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW

	{

		.procname	= "unaligned-trap",

		.data		= &unaligned_enabled,