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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2014-11-15 15:45:07 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-11-15 15:45:07 -0800 |
| commit | 5f01feb8b97a4d65caa1456cb12f0f770497347f (patch) | |
| tree | 765682478831281bf8ce650def998a07839e04bd | |
| parent | 555e5986bab6715ad6e39a35aeb67a218cc80abf (diff) | |
| parent | 08b964ff3c51b10aaf2e6ba639f40054c09f0f7a (diff) | |
| download | lwn-5f01feb8b97a4d65caa1456cb12f0f770497347f.tar.gz lwn-5f01feb8b97a4d65caa1456cb12f0f770497347f.zip | |
Merge branch 'fixes' of git://ftp.arm.linux.org.uk/~rmk/linux-arm
Pull ARM fixes from Russell King:
"Two fixes this time, one to ensure that the kuser helper option
depends on MMU as they aren't available for noMMU targets (and if the
option is selected, we end up oopsing.)
The second fix plugs a corner case with the decompressor, ensuring
that the instruction stream can see the relocated code in every case
on ARMv7 CPUs"
* 'fixes' of git://ftp.arm.linux.org.uk/~rmk/linux-arm:
ARM: 8198/1: make kuser helpers depend on MMU
ARM: 8191/1: decompressor: ensure I-side picks up relocated code
| -rw-r--r-- | arch/arm/boot/compressed/head.S | 20 | ||||
| -rw-r--r-- | arch/arm/mm/Kconfig | 1 |
2 files changed, 17 insertions, 4 deletions
diff --git a/arch/arm/boot/compressed/head.S b/arch/arm/boot/compressed/head.S index 413fd94b5301..68be9017593d 100644 --- a/arch/arm/boot/compressed/head.S +++ b/arch/arm/boot/compressed/head.S @@ -397,8 +397,7 @@ dtb_check_done: add sp, sp, r6 #endif - tst r4, #1 - bleq cache_clean_flush + bl cache_clean_flush adr r0, BSYM(restart) add r0, r0, r6 @@ -1047,6 +1046,8 @@ cache_clean_flush: b call_cache_fn __armv4_mpu_cache_flush: + tst r4, #1 + movne pc, lr mov r2, #1 mov r3, #0 mcr p15, 0, ip, c7, c6, 0 @ invalidate D cache @@ -1064,6 +1065,8 @@ __armv4_mpu_cache_flush: mov pc, lr __fa526_cache_flush: + tst r4, #1 + movne pc, lr mov r1, #0 mcr p15, 0, r1, c7, c14, 0 @ clean and invalidate D cache mcr p15, 0, r1, c7, c5, 0 @ flush I cache @@ -1072,13 +1075,16 @@ __fa526_cache_flush: __armv6_mmu_cache_flush: mov r1, #0 - mcr p15, 0, r1, c7, c14, 0 @ clean+invalidate D + tst r4, #1 + mcreq p15, 0, r1, c7, c14, 0 @ clean+invalidate D mcr p15, 0, r1, c7, c5, 0 @ invalidate I+BTB - mcr p15, 0, r1, c7, c15, 0 @ clean+invalidate unified + mcreq p15, 0, r1, c7, c15, 0 @ clean+invalidate unified mcr p15, 0, r1, c7, c10, 4 @ drain WB mov pc, lr __armv7_mmu_cache_flush: + tst r4, #1 + bne iflush mrc p15, 0, r10, c0, c1, 5 @ read ID_MMFR1 tst r10, #0xf << 16 @ hierarchical cache (ARMv7) mov r10, #0 @@ -1139,6 +1145,8 @@ iflush: mov pc, lr __armv5tej_mmu_cache_flush: + tst r4, #1 + movne pc, lr 1: mrc p15, 0, r15, c7, c14, 3 @ test,clean,invalidate D cache bne 1b mcr p15, 0, r0, c7, c5, 0 @ flush I cache @@ -1146,6 +1154,8 @@ __armv5tej_mmu_cache_flush: mov pc, lr __armv4_mmu_cache_flush: + tst r4, #1 + movne pc, lr mov r2, #64*1024 @ default: 32K dcache size (*2) mov r11, #32 @ default: 32 byte line size mrc p15, 0, r3, c0, c0, 1 @ read cache type @@ -1179,6 +1189,8 @@ no_cache_id: __armv3_mmu_cache_flush: __armv3_mpu_cache_flush: + tst r4, #1 + movne pc, lr mov r1, #0 mcr p15, 0, r1, c7, c0, 0 @ invalidate whole cache v3 mov pc, lr diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig index ae69809a9e47..7eb94e6fc376 100644 --- a/arch/arm/mm/Kconfig +++ b/arch/arm/mm/Kconfig @@ -798,6 +798,7 @@ config NEED_KUSER_HELPERS config KUSER_HELPERS bool "Enable kuser helpers in vector page" if !NEED_KUSER_HELPERS + depends on MMU default y help Warning: disabling this option may break user programs. |