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>

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: