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authorRussell King <rmk+kernel@arm.linux.org.uk>2015-08-19 21:23:48 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2015-08-21 13:55:49 +0100
commit1eef5d2f1b461c120bcd82077edee5ec706ac53b (patch)
treeb95a7132189a44d9a826e7b44fbbe5cae74d75fb /arch/arm/kernel/entry-armv.S
parentd770e558e21961ad6cfdf0ff7df0eb5d7d4f0754 (diff)
downloadlinux-linaro-stable-1eef5d2f1b461c120bcd82077edee5ec706ac53b.tar.gz
ARM: domains: switch to keeping domain value in register
Rather than modifying both the domain access control register and our per-thread copy, modify only the domain access control register, and use the per-thread copy to save and restore the register over context switches. We can also avoid the explicit initialisation of the init thread_info structure. This allows us to avoid needing to gain access to the thread information at the uaccess control sites. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/kernel/entry-armv.S')
-rw-r--r--arch/arm/kernel/entry-armv.S2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S
index 7dac3086e361..d19adcf6c580 100644
--- a/arch/arm/kernel/entry-armv.S
+++ b/arch/arm/kernel/entry-armv.S
@@ -770,6 +770,8 @@ ENTRY(__switch_to)
ldr r4, [r2, #TI_TP_VALUE]
ldr r5, [r2, #TI_TP_VALUE + 4]
#ifdef CONFIG_CPU_USE_DOMAINS
+ mrc p15, 0, r6, c3, c0, 0 @ Get domain register
+ str r6, [r1, #TI_CPU_DOMAIN] @ Save old domain register
ldr r6, [r2, #TI_CPU_DOMAIN]
#endif
switch_tls r1, r4, r5, r3, r7