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authorCatalin Marinas <catalin.marinas@arm.com>2014-04-02 10:57:49 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2014-04-09 13:08:08 +0100
commit0b1f68e836bcf1ca2861f95066985c57ecfb2f1a (patch)
tree2cc6151c12ad8629834eefa35fc1f68442a16f73 /arch/arm
parent39ad04ccd6e1b235601e9ac5a7f508d05728a97a (diff)
downloadlinux-0b1f68e836bcf1ca2861f95066985c57ecfb2f1a.tar.bz2
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>
Diffstat (limited to 'arch/arm')
-rw-r--r--arch/arm/include/asm/assembler.h32
-rw-r--r--arch/arm/vfp/entry.S20
-rw-r--r--arch/arm/vfp/vfphw.S14
3 files changed, 37 insertions, 29 deletions
diff --git a/arch/arm/include/asm/assembler.h b/arch/arm/include/asm/assembler.h
index 9a4965ad6867..b974184f9941 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 9cc290ae4e3b..f0759e70fb86 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 98f6246c9002..be807625ed8c 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: