diff options
| author | Catalin Marinas <catalin.marinas@arm.com> | 2014-04-02 10:57:49 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2014-04-09 13:08:08 +0100 |
| commit | 0b1f68e836bcf1ca2861f95066985c57ecfb2f1a (patch) | |
| tree | 2cc6151c12ad8629834eefa35fc1f68442a16f73 | |
| parent | 39ad04ccd6e1b235601e9ac5a7f508d05728a97a (diff) | |
| download | rt-linux-0b1f68e836bcf1ca2861f95066985c57ecfb2f1a.tar.gz | |
ARM: 8018/1: Add {inc,dec}_preempt_count asm macros
The patch adds asm macros for inc_preempt_count and dec_preempt_count_ti
(which also gets the current thread_info) instead of open-coding them in
arch/arm/vfp/*.S files.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Tested-by: Arun KS <getarunks@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| -rw-r--r-- | arch/arm/include/asm/assembler.h | 32 | ||||
| -rw-r--r-- | arch/arm/vfp/entry.S | 20 | ||||
| -rw-r--r-- | arch/arm/vfp/vfphw.S | 14 |
3 files changed, 37 insertions, 29 deletions
diff --git a/arch/arm/include/asm/assembler.h b/arch/arm/include/asm/assembler.h index 9a4965ad6867d5..b974184f994188 100644 --- a/arch/arm/include/asm/assembler.h +++ b/arch/arm/include/asm/assembler.h @@ -23,6 +23,7 @@ #include <asm/ptrace.h> #include <asm/domain.h> #include <asm/opcodes-virt.h> +#include <asm/asm-offsets.h> #define IOMEM(x) (x) @@ -184,6 +185,37 @@ mov \rd, \rd, lsl #13 .endm +/* + * Increment/decrement the preempt count. + */ +#ifdef CONFIG_PREEMPT_COUNT + .macro inc_preempt_count, ti, tmp + ldr \tmp, [\ti, #TI_PREEMPT] @ get preempt count + add \tmp, \tmp, #1 @ increment it + str \tmp, [\ti, #TI_PREEMPT] + .endm + + .macro dec_preempt_count, ti, tmp + ldr \tmp, [\ti, #TI_PREEMPT] @ get preempt count + sub \tmp, \tmp, #1 @ decrement it + str \tmp, [\ti, #TI_PREEMPT] + .endm + + .macro dec_preempt_count_ti, ti, tmp + get_thread_info \ti + dec_preempt_count \ti, \tmp + .endm +#else + .macro inc_preempt_count, ti, tmp + .endm + + .macro dec_preempt_count, ti, tmp + .endm + + .macro dec_preempt_count_ti, ti, tmp + .endm +#endif + #define USER(x...) \ 9999: x; \ .pushsection __ex_table,"a"; \ diff --git a/arch/arm/vfp/entry.S b/arch/arm/vfp/entry.S index 9cc290ae4e3be2..f0759e70fb865b 100644 --- a/arch/arm/vfp/entry.S +++ b/arch/arm/vfp/entry.S @@ -25,11 +25,7 @@ @ IRQs disabled. @ ENTRY(do_vfp) -#ifdef CONFIG_PREEMPT_COUNT - ldr r4, [r10, #TI_PREEMPT] @ get preempt count - add r11, r4, #1 @ increment it - str r11, [r10, #TI_PREEMPT] -#endif + inc_preempt_count r10, r4 enable_irq ldr r4, .LCvfp ldr r11, [r10, #TI_CPU] @ CPU number @@ -38,12 +34,7 @@ ENTRY(do_vfp) ENDPROC(do_vfp) ENTRY(vfp_null_entry) -#ifdef CONFIG_PREEMPT_COUNT - get_thread_info r10 - ldr r4, [r10, #TI_PREEMPT] @ get preempt count - sub r11, r4, #1 @ decrement it - str r11, [r10, #TI_PREEMPT] -#endif + dec_preempt_count_ti r10, r4 mov pc, lr ENDPROC(vfp_null_entry) @@ -56,12 +47,7 @@ ENDPROC(vfp_null_entry) __INIT ENTRY(vfp_testing_entry) -#ifdef CONFIG_PREEMPT_COUNT - get_thread_info r10 - ldr r4, [r10, #TI_PREEMPT] @ get preempt count - sub r11, r4, #1 @ decrement it - str r11, [r10, #TI_PREEMPT] -#endif + dec_preempt_count_ti r10, r4 ldr r0, VFP_arch_address str r0, [r0] @ set to non-zero value mov pc, r9 @ we have handled the fault diff --git a/arch/arm/vfp/vfphw.S b/arch/arm/vfp/vfphw.S index 98f6246c90025b..be807625ed8c23 100644 --- a/arch/arm/vfp/vfphw.S +++ b/arch/arm/vfp/vfphw.S @@ -182,12 +182,7 @@ vfp_hw_state_valid: @ else it's one 32-bit instruction, so @ always subtract 4 from the following @ instruction address. -#ifdef CONFIG_PREEMPT_COUNT - get_thread_info r10 - ldr r4, [r10, #TI_PREEMPT] @ get preempt count - sub r11, r4, #1 @ decrement it - str r11, [r10, #TI_PREEMPT] -#endif + dec_preempt_count_ti r10, r4 mov pc, r9 @ we think we have handled things @@ -206,12 +201,7 @@ look_for_VFP_exceptions: @ not recognised by VFP DBGSTR "not VFP" -#ifdef CONFIG_PREEMPT_COUNT - get_thread_info r10 - ldr r4, [r10, #TI_PREEMPT] @ get preempt count - sub r11, r4, #1 @ decrement it - str r11, [r10, #TI_PREEMPT] -#endif + dec_preempt_count_ti r10, r4 mov pc, lr process_exception: |