diff options
| author | Catalin Marinas <catalin.marinas@arm.com> | 2014-04-22 16:14:27 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2014-04-25 12:06:37 +0100 |
| commit | 431a84b1a4f7d1a0085d5b91330c5053cc8e8b12 (patch) | |
| tree | c4291aef9feb162eefe9cad19b290231f0c4d6f9 /arch/arm/kernel | |
| parent | a05e54c103b0b8e1dab5d04b411f1d48387c4903 (diff) | |
ARM: 8034/1: Disable preemption in iwmmxt_task_enable()
This patch is in preparation for calling the iwmmxt_task_enable()
function with interrupts enabled.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/kernel')
| -rw-r--r-- | arch/arm/kernel/iwmmxt.S | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/arch/arm/kernel/iwmmxt.S b/arch/arm/kernel/iwmmxt.S index a08783823b3..fcb33a70a35 100644 --- a/arch/arm/kernel/iwmmxt.S +++ b/arch/arm/kernel/iwmmxt.S @@ -18,6 +18,7 @@ #include <asm/ptrace.h> #include <asm/thread_info.h> #include <asm/asm-offsets.h> +#include <asm/assembler.h> #if defined(CONFIG_CPU_PJ4) #define PJ4(code...) code @@ -65,13 +66,14 @@ */ ENTRY(iwmmxt_task_enable) + inc_preempt_count r10, r3 XSC(mrc p15, 0, r2, c15, c1, 0) PJ4(mrc p15, 0, r2, c1, c0, 2) @ CP0 and CP1 accessible? XSC(tst r2, #0x3) PJ4(tst r2, #0xf) - movne pc, lr @ if so no business here + bne 4f @ if so no business here @ enable access to CP0 and CP1 XSC(orr r2, r2, #0x3) XSC(mcr p15, 0, r2, c15, c1, 0) @@ -132,7 +134,7 @@ concan_dump: wstrd wR15, [r1, #MMX_WR15] 2: teq r0, #0 @ anything to load? - moveq pc, lr + beq 3f concan_load: @@ -165,8 +167,14 @@ concan_load: @ clear CUP/MUP (only if r1 != 0) teq r1, #0 mov r2, #0 - moveq pc, lr + beq 3f tmcr wCon, r2 + +3: +#ifdef CONFIG_PREEMPT_COUNT + get_thread_info r10 +#endif +4: dec_preempt_count r10, r3 mov pc, lr /* |