mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
synced 2024-12-18 23:38:26 +02:00
316a885776
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@11209 3c298f89-4303-0410-b956-a3cf2f4a3e73
39 lines
1.7 KiB
Diff
39 lines
1.7 KiB
Diff
Change the default alingment handling to not be silent failure
|
|
Index: linux-2.6.21.7/arch/arm/mm/alignment.c
|
|
===================================================================
|
|
--- linux-2.6.21.7.orig/arch/arm/mm/alignment.c
|
|
+++ linux-2.6.21.7/arch/arm/mm/alignment.c
|
|
@@ -797,6 +797,8 @@ static int __init alignment_init(void)
|
|
res->write_proc = proc_alignment_write;
|
|
#endif
|
|
|
|
+ ai_usermode = CONFIG_ALIGNMENT_HANDLING;
|
|
+
|
|
hook_fault_code(1, do_alignment, SIGILL, "alignment exception");
|
|
hook_fault_code(3, do_alignment, SIGILL, "alignment exception");
|
|
|
|
Index: linux-2.6.21.7/arch/arm/Kconfig
|
|
===================================================================
|
|
--- linux-2.6.21.7.orig/arch/arm/Kconfig
|
|
+++ linux-2.6.21.7/arch/arm/Kconfig
|
|
@@ -709,6 +709,19 @@ config ALIGNMENT_TRAP
|
|
correct operation of some network protocols. With an IP-only
|
|
configuration it is safe to say N, otherwise say Y.
|
|
|
|
+config ALIGNMENT_HANDLING
|
|
+ hex "Userspace alignment trap handling"
|
|
+ default "0x3"
|
|
+ depends on ALIGNMENT_TRAP
|
|
+ help
|
|
+ How should we handle alignment errors in userspace by default? This is a bitfield where:
|
|
+ 0 - silently ignore alignment errors (will lead to unexpected results)
|
|
+ 1 - report alignment errors through printk (will lead to unexpected results, but you'll know about them)
|
|
+ 2 - fix the alignment and make things work properly (performance degradation for un-aligned code)
|
|
+ 4 - raise SIGBUS on alignment traps
|
|
+ A good number to choose is probably either 3 (work slowly but log message) or 5 (log message and SIGBUS).
|
|
+ You can change the behavior at runtime through /proc/cpu/alignment if you have PROC_FS enabled.
|
|
+
|
|
endmenu
|
|
|
|
menu "Boot options"
|