From: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>
Two files that get included when building the multi_v7_defconfig target
fail to build when selecting THUMB2_KERNEL for this configuration.
In both cases, we can just build the file as ARM code, as none of its
symbols are exported to modules, so there are no interworking concerns.
In the iwmmxt.S case, add ENDPROC() declarations so the symbols are
annotated as functions, resulting in the linker to emit the appropriate
mode switches.
Acked-by: Nicolas Pitre <nico@xxxxxxxxxx>
Tested-by: Olof Johansson <olof@xxxxxxxxx>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>
Signed-off-by: Russell King <rmk+kernel@xxxxxxxxxxxxxxxx>
(cherry picked from commit 13d1b9575ac2c2da143cd2236b6cf0fc314570f8)
Cc: <stable@xxxxxxxxxxxxxxx> # v3.18+
Signed-off-by: Kevin Hilman <khilman@xxxxxxxxxx>
---
arch/arm/kernel/Makefile | 1 +
arch/arm/kernel/iwmmxt.S | 13 +++++++++++++
2 files changed, 14 insertions(+)
diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile
index 03120e656aea..2ecc7d15bc09 100644
--- a/arch/arm/kernel/Makefile
+++ b/arch/arm/kernel/Makefile
@@ -84,6 +84,7 @@ obj-$(CONFIG_CPU_PJ4B) += pj4-cp0.o
obj-$(CONFIG_IWMMXT) += iwmmxt.o
obj-$(CONFIG_PERF_EVENTS) += perf_regs.o
obj-$(CONFIG_HW_PERF_EVENTS) += perf_event.o perf_event_cpu.o
+CFLAGS_pj4-cp0.o := -marm
AFLAGS_iwmmxt.o := -Wa,-mcpu=iwmmxt
obj-$(CONFIG_ARM_CPU_TOPOLOGY) += topology.o
diff --git a/arch/arm/kernel/iwmmxt.S b/arch/arm/kernel/iwmmxt.S
index ad58e565fe98..49fadbda8c63 100644
--- a/arch/arm/kernel/iwmmxt.S
+++ b/arch/arm/kernel/iwmmxt.S
@@ -58,6 +58,7 @@
#define MMX_SIZE (0x98)
.text
+ .arm
/*
* Lazy switching of Concan coprocessor context
@@ -182,6 +183,8 @@ concan_load:
tmcr wCon, r2
ret lr
+ENDPROC(iwmmxt_task_enable)
+
/*
* Back up Concan regs to save area and disable access to them
* (mainly for gdb or sleep mode usage)
@@ -232,6 +235,8 @@ ENTRY(iwmmxt_task_disable)
1: msr cpsr_c, ip @ restore interrupt mode
ldmfd sp!, {r4, pc}
+ENDPROC(iwmmxt_task_disable)
+
/*
* Copy Concan state to given memory address
*
@@ -268,6 +273,8 @@ ENTRY(iwmmxt_task_copy)
msr cpsr_c, ip @ restore interrupt mode
ret r3
+ENDPROC(iwmmxt_task_copy)
+
/*
* Restore Concan state from given memory address
*
@@ -304,6 +311,8 @@ ENTRY(iwmmxt_task_restore)
msr cpsr_c, ip @ restore interrupt mode
ret r3
+ENDPROC(iwmmxt_task_restore)
+
/*
* Concan handling on task switch
*
@@ -335,6 +344,8 @@ ENTRY(iwmmxt_task_switch)
mrc p15, 0, r1, c2, c0, 0
sub pc, lr, r1, lsr #32 @ cpwait and return
+ENDPROC(iwmmxt_task_switch)
+
/*
* Remove Concan ownership of given task
*
@@ -353,6 +364,8 @@ ENTRY(iwmmxt_task_release)
msr cpsr_c, r2 @ restore interrupts
ret lr
+ENDPROC(iwmmxt_task_release)
+
.data
concan_owner:
.word 0
--
2.3.1
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