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authorLinus Torvalds <torvalds@linux-foundation.org>2015-09-19 21:05:02 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2015-09-19 21:05:02 -0700
commit99bc7215bc60f6cd414cf1b85cd9d52cc596cccb (patch)
tree8bba8cc01d6494acd2443ccce4dfba1612d58981
parent30ec56824897fc70f668dcb302f08cc9080eadfa (diff)
parent7ae85dc7687c7e7119053d83d02c560ea217b772 (diff)
Merge branch 'fixes' of git://ftp.arm.linux.org.uk/~rmk/linux-arm
Pull ARM fixes from Russell King: "Three fixes and a resulting cleanup for -rc2: - Andre Przywara reported that he was seeing a warning with the new cast inside DMA_ERROR_CODE's definition, and fixed the incorrect use. - Doug Anderson noticed that kgdb causes a "scheduling while atomic" bug. - OMAP5 folk noticed that their Thumb-2 compiled X servers crashed when enabling support to cover ARMv6 CPUs due to a kernel bug leaking some conditional context into the signal handler" * 'fixes' of git://ftp.arm.linux.org.uk/~rmk/linux-arm: ARM: 8425/1: kgdb: Don't try to stop the machine when setting breakpoints ARM: 8437/1: dma-mapping: fix build warning with new DMA_ERROR_CODE definition ARM: get rid of needless #if in signal handling code ARM: fix Thumb2 signal handling when ARMv6 is enabled
-rw-r--r--arch/arm/kernel/kgdb.c8
-rw-r--r--arch/arm/kernel/signal.c15
-rw-r--r--arch/arm/mm/dma-mapping.c4
3 files changed, 17 insertions, 10 deletions
diff --git a/arch/arm/kernel/kgdb.c b/arch/arm/kernel/kgdb.c
index a6ad93c9bce3..fd9eefce0a7b 100644
--- a/arch/arm/kernel/kgdb.c
+++ b/arch/arm/kernel/kgdb.c
@@ -259,15 +259,17 @@ int kgdb_arch_set_breakpoint(struct kgdb_bkpt *bpt)
if (err)
return err;
- patch_text((void *)bpt->bpt_addr,
- *(unsigned int *)arch_kgdb_ops.gdb_bpt_instr);
+ /* Machine is already stopped, so we can use __patch_text() directly */
+ __patch_text((void *)bpt->bpt_addr,
+ *(unsigned int *)arch_kgdb_ops.gdb_bpt_instr);
return err;
}
int kgdb_arch_remove_breakpoint(struct kgdb_bkpt *bpt)
{
- patch_text((void *)bpt->bpt_addr, *(unsigned int *)bpt->saved_instr);
+ /* Machine is already stopped, so we can use __patch_text() directly */
+ __patch_text((void *)bpt->bpt_addr, *(unsigned int *)bpt->saved_instr);
return 0;
}
diff --git a/arch/arm/kernel/signal.c b/arch/arm/kernel/signal.c
index b6cda06b455f..7b8f2141427b 100644
--- a/arch/arm/kernel/signal.c
+++ b/arch/arm/kernel/signal.c
@@ -343,15 +343,18 @@ setup_return(struct pt_regs *regs, struct ksignal *ksig,
*/
thumb = handler & 1;
-#if __LINUX_ARM_ARCH__ >= 7
/*
- * Clear the If-Then Thumb-2 execution state
- * ARM spec requires this to be all 000s in ARM mode
- * Snapdragon S4/Krait misbehaves on a Thumb=>ARM
- * signal transition without this.
+ * Clear the If-Then Thumb-2 execution state. ARM spec
+ * requires this to be all 000s in ARM mode. Snapdragon
+ * S4/Krait misbehaves on a Thumb=>ARM signal transition
+ * without this.
+ *
+ * We must do this whenever we are running on a Thumb-2
+ * capable CPU, which includes ARMv6T2. However, we elect
+ * to always do this to simplify the code; this field is
+ * marked UNK/SBZP for older architectures.
*/
cpsr &= ~PSR_IT_MASK;
-#endif
if (thumb) {
cpsr |= PSR_T_BIT;
diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index e62604384945..1a7815e5421b 100644
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c
@@ -1249,7 +1249,7 @@ __iommu_create_mapping(struct device *dev, struct page **pages, size_t size)
struct dma_iommu_mapping *mapping = to_dma_iommu_mapping(dev);
unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT;
dma_addr_t dma_addr, iova;
- int i, ret = DMA_ERROR_CODE;
+ int i;
dma_addr = __alloc_iova(mapping, size);
if (dma_addr == DMA_ERROR_CODE)
@@ -1257,6 +1257,8 @@ __iommu_create_mapping(struct device *dev, struct page **pages, size_t size)
iova = dma_addr;
for (i = 0; i < count; ) {
+ int ret;
+
unsigned int next_pfn = page_to_pfn(pages[i]) + 1;
phys_addr_t phys = page_to_phys(pages[i]);
unsigned int len, j;