Merge tag 'arc-fixes-for-3.16' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc
Pull ARC fixes from Vineet Gupta:
"Some SMP changes, a ptrace request for NPTL debugging, bunch of build
breakages/warnings"
* tag 'arc-fixes-for-3.16' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc:
ARC: [SMP] Enable icache coherency
ARC: [SMP] Fix IPI IRQ registration
ARC: Implement ptrace(PTRACE_GET_THREAD_AREA)
ARC: optimize kernel bss clearing in early boot code
ARC: Fix build breakage for !CONFIG_ARC_DW2_UNWIND
ARC: fix build warning in devtree
ARC: remove checks for CONFIG_ARC_MMU_V4
diff --git a/arch/arc/include/asm/cache.h b/arch/arc/include/asm/cache.h
index c1d3d2d..b3c7509 100644
--- a/arch/arc/include/asm/cache.h
+++ b/arch/arc/include/asm/cache.h
@@ -60,7 +60,7 @@
#define ARC_REG_IC_IVIC 0x10
#define ARC_REG_IC_CTRL 0x11
#define ARC_REG_IC_IVIL 0x19
-#if defined(CONFIG_ARC_MMU_V3) || defined (CONFIG_ARC_MMU_V4)
+#if defined(CONFIG_ARC_MMU_V3)
#define ARC_REG_IC_PTAG 0x1E
#endif
@@ -74,7 +74,7 @@
#define ARC_REG_DC_IVDL 0x4A
#define ARC_REG_DC_FLSH 0x4B
#define ARC_REG_DC_FLDL 0x4C
-#if defined(CONFIG_ARC_MMU_V3) || defined (CONFIG_ARC_MMU_V4)
+#if defined(CONFIG_ARC_MMU_V3)
#define ARC_REG_DC_PTAG 0x5C
#endif
diff --git a/arch/arc/include/uapi/asm/ptrace.h b/arch/arc/include/uapi/asm/ptrace.h
index 2618cc13..76a7739 100644
--- a/arch/arc/include/uapi/asm/ptrace.h
+++ b/arch/arc/include/uapi/asm/ptrace.h
@@ -11,6 +11,7 @@
#ifndef _UAPI__ASM_ARC_PTRACE_H
#define _UAPI__ASM_ARC_PTRACE_H
+#define PTRACE_GET_THREAD_AREA 25
#ifndef __ASSEMBLY__
/*
diff --git a/arch/arc/kernel/ctx_sw_asm.S b/arch/arc/kernel/ctx_sw_asm.S
index 2ff0347..e248594 100644
--- a/arch/arc/kernel/ctx_sw_asm.S
+++ b/arch/arc/kernel/ctx_sw_asm.S
@@ -10,9 +10,9 @@
* -This is the more "natural" hand written assembler
*/
+#include <linux/linkage.h>
#include <asm/entry.h> /* For the SAVE_* macros */
#include <asm/asm-offsets.h>
-#include <asm/linkage.h>
#define KSP_WORD_OFF ((TASK_THREAD + THREAD_KSP) / 4)
diff --git a/arch/arc/kernel/devtree.c b/arch/arc/kernel/devtree.c
index 0b3ef40..fffdb5e 100644
--- a/arch/arc/kernel/devtree.c
+++ b/arch/arc/kernel/devtree.c
@@ -41,7 +41,7 @@
{
const struct machine_desc *mdesc;
unsigned long dt_root;
- void *clk;
+ const void *clk;
int len;
if (!early_init_dt_scan(dt))
diff --git a/arch/arc/kernel/head.S b/arch/arc/kernel/head.S
index 07a58f2..4d2481b 100644
--- a/arch/arc/kernel/head.S
+++ b/arch/arc/kernel/head.S
@@ -77,10 +77,11 @@
; Clear BSS before updating any globals
; XXX: use ZOL here
mov r5, __bss_start
- mov r6, __bss_stop
+ sub r6, __bss_stop, r5
+ lsr.f lp_count, r6, 2
+ lpnz 1f
+ st.ab 0, [r5, 4]
1:
- st.ab 0, [r5,4]
- brlt r5, r6, 1b
; Uboot - kernel ABI
; r0 = [0] No uboot interaction, [1] cmdline in r2, [2] DTB in r2
diff --git a/arch/arc/kernel/ptrace.c b/arch/arc/kernel/ptrace.c
index 5d76706..13b3ffb 100644
--- a/arch/arc/kernel/ptrace.c
+++ b/arch/arc/kernel/ptrace.c
@@ -146,6 +146,10 @@
pr_debug("REQ=%ld: ADDR =0x%lx, DATA=0x%lx)\n", request, addr, data);
switch (request) {
+ case PTRACE_GET_THREAD_AREA:
+ ret = put_user(task_thread_info(child)->thr_ptr,
+ (unsigned long __user *)data);
+ break;
default:
ret = ptrace_request(child, request, addr, data);
break;
diff --git a/arch/arc/kernel/smp.c b/arch/arc/kernel/smp.c
index cf90b6f..c802bb5 100644
--- a/arch/arc/kernel/smp.c
+++ b/arch/arc/kernel/smp.c
@@ -337,8 +337,19 @@
* API called by platform code to hookup arch-common ISR to their IPI IRQ
*/
static DEFINE_PER_CPU(int, ipi_dev);
+
+static struct irqaction arc_ipi_irq = {
+ .name = "IPI Interrupt",
+ .flags = IRQF_PERCPU,
+ .handler = do_IPI,
+};
+
int smp_ipi_irq_setup(int cpu, int irq)
{
- int *dev_id = &per_cpu(ipi_dev, smp_processor_id());
- return request_percpu_irq(irq, do_IPI, "IPI Interrupt", dev_id);
+ if (!cpu)
+ return setup_irq(irq, &arc_ipi_irq);
+ else
+ arch_unmask_irq(irq);
+
+ return 0;
}
diff --git a/arch/arc/kernel/vmlinux.lds.S b/arch/arc/kernel/vmlinux.lds.S
index 2555f58..dd35bde 100644
--- a/arch/arc/kernel/vmlinux.lds.S
+++ b/arch/arc/kernel/vmlinux.lds.S
@@ -116,7 +116,7 @@
_edata = .;
- BSS_SECTION(0, 0, 0)
+ BSS_SECTION(4, 4, 4)
#ifdef CONFIG_ARC_DW2_UNWIND
. = ALIGN(PAGE_SIZE);
diff --git a/arch/arc/mm/cache_arc700.c b/arch/arc/mm/cache_arc700.c
index 1f676c4..353b202 100644
--- a/arch/arc/mm/cache_arc700.c
+++ b/arch/arc/mm/cache_arc700.c
@@ -389,7 +389,7 @@
/***********************************************************
* Machine specific helper for per line I-Cache invalidate.
*/
-static void __ic_line_inv_vaddr(unsigned long paddr, unsigned long vaddr,
+static void __ic_line_inv_vaddr_local(unsigned long paddr, unsigned long vaddr,
unsigned long sz)
{
unsigned long flags;
@@ -405,6 +405,23 @@
read_aux_reg(ARC_REG_IC_CTRL); /* blocks */
}
+struct ic_line_inv_vaddr_ipi {
+ unsigned long paddr, vaddr;
+ int sz;
+};
+
+static void __ic_line_inv_vaddr_helper(void *info)
+{
+ struct ic_line_inv_vaddr_ipi *ic_inv = (struct ic_line_inv_vaddr_ipi*) info;
+ __ic_line_inv_vaddr_local(ic_inv->paddr, ic_inv->vaddr, ic_inv->sz);
+}
+
+static void __ic_line_inv_vaddr(unsigned long paddr, unsigned long vaddr,
+ unsigned long sz)
+{
+ struct ic_line_inv_vaddr_ipi ic_inv = { paddr, vaddr , sz};
+ on_each_cpu(__ic_line_inv_vaddr_helper, &ic_inv, 1);
+}
#else
#define __ic_entire_inv()
@@ -553,12 +570,8 @@
*/
void __sync_icache_dcache(unsigned long paddr, unsigned long vaddr, int len)
{
- unsigned long flags;
-
- local_irq_save(flags);
- __ic_line_inv_vaddr(paddr, vaddr, len);
__dc_line_op(paddr, vaddr, len, OP_FLUSH_N_INV);
- local_irq_restore(flags);
+ __ic_line_inv_vaddr(paddr, vaddr, len);
}
/* wrapper to compile time eliminate alignment checks in flush loop */