* [for-next][PATCH 1/2] Uprobes: Simplify uprobe_register() body
2018-08-14 15:28 [for-next][PATCH 0/2] tracing: A couple of uprobe updates for 4.19 Steven Rostedt
@ 2018-08-14 15:28 ` Steven Rostedt
2018-08-14 15:28 ` [for-next][PATCH 2/2] Uprobe: Additional argument arch_uprobe to uprobe_write_opcode() Steven Rostedt
1 sibling, 0 replies; 3+ messages in thread
From: Steven Rostedt @ 2018-08-14 15:28 UTC (permalink / raw)
To: linux-kernel
Cc: Ingo Molnar, Andrew Morton, Song Liu, Srikar Dronamraju, Ravi Bangoria
From: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
Simplify uprobe_register() function body and let __uprobe_register()
handle everything. Also move dependency functions around to avoid build
failures.
Link: http://lkml.kernel.org/r/20180809041856.1547-2-ravi.bangoria@linux.ibm.com
Reviewed-by: Song Liu <songliubraving@fb.com>
Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
kernel/events/uprobes.c | 69 +++++++++++++++++++++--------------------
1 file changed, 36 insertions(+), 33 deletions(-)
diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index ccc579a7d32e..471eac896635 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -840,13 +840,8 @@ register_for_each_vma(struct uprobe *uprobe, struct uprobe_consumer *new)
return err;
}
-static int __uprobe_register(struct uprobe *uprobe, struct uprobe_consumer *uc)
-{
- consumer_add(uprobe, uc);
- return register_for_each_vma(uprobe, uc);
-}
-
-static void __uprobe_unregister(struct uprobe *uprobe, struct uprobe_consumer *uc)
+static void
+__uprobe_unregister(struct uprobe *uprobe, struct uprobe_consumer *uc)
{
int err;
@@ -860,24 +855,46 @@ static void __uprobe_unregister(struct uprobe *uprobe, struct uprobe_consumer *u
}
/*
- * uprobe_register - register a probe
+ * uprobe_unregister - unregister a already registered probe.
+ * @inode: the file in which the probe has to be removed.
+ * @offset: offset from the start of the file.
+ * @uc: identify which probe if multiple probes are colocated.
+ */
+void uprobe_unregister(struct inode *inode, loff_t offset, struct uprobe_consumer *uc)
+{
+ struct uprobe *uprobe;
+
+ uprobe = find_uprobe(inode, offset);
+ if (WARN_ON(!uprobe))
+ return;
+
+ down_write(&uprobe->register_rwsem);
+ __uprobe_unregister(uprobe, uc);
+ up_write(&uprobe->register_rwsem);
+ put_uprobe(uprobe);
+}
+EXPORT_SYMBOL_GPL(uprobe_unregister);
+
+/*
+ * __uprobe_register - register a probe
* @inode: the file in which the probe has to be placed.
* @offset: offset from the start of the file.
* @uc: information on howto handle the probe..
*
- * Apart from the access refcount, uprobe_register() takes a creation
+ * Apart from the access refcount, __uprobe_register() takes a creation
* refcount (thro alloc_uprobe) if and only if this @uprobe is getting
* inserted into the rbtree (i.e first consumer for a @inode:@offset
* tuple). Creation refcount stops uprobe_unregister from freeing the
* @uprobe even before the register operation is complete. Creation
* refcount is released when the last @uc for the @uprobe
- * unregisters. Caller of uprobe_register() is required to keep @inode
+ * unregisters. Caller of __uprobe_register() is required to keep @inode
* (and the containing mount) referenced.
*
* Return errno if it cannot successully install probes
* else return 0 (success)
*/
-int uprobe_register(struct inode *inode, loff_t offset, struct uprobe_consumer *uc)
+static int __uprobe_register(struct inode *inode, loff_t offset,
+ struct uprobe_consumer *uc)
{
struct uprobe *uprobe;
int ret;
@@ -904,7 +921,8 @@ int uprobe_register(struct inode *inode, loff_t offset, struct uprobe_consumer *
down_write(&uprobe->register_rwsem);
ret = -EAGAIN;
if (likely(uprobe_is_active(uprobe))) {
- ret = __uprobe_register(uprobe, uc);
+ consumer_add(uprobe, uc);
+ ret = register_for_each_vma(uprobe, uc);
if (ret)
__uprobe_unregister(uprobe, uc);
}
@@ -915,6 +933,12 @@ int uprobe_register(struct inode *inode, loff_t offset, struct uprobe_consumer *
goto retry;
return ret;
}
+
+int uprobe_register(struct inode *inode, loff_t offset,
+ struct uprobe_consumer *uc)
+{
+ return __uprobe_register(inode, offset, uc);
+}
EXPORT_SYMBOL_GPL(uprobe_register);
/*
@@ -946,27 +970,6 @@ int uprobe_apply(struct inode *inode, loff_t offset,
return ret;
}
-/*
- * uprobe_unregister - unregister a already registered probe.
- * @inode: the file in which the probe has to be removed.
- * @offset: offset from the start of the file.
- * @uc: identify which probe if multiple probes are colocated.
- */
-void uprobe_unregister(struct inode *inode, loff_t offset, struct uprobe_consumer *uc)
-{
- struct uprobe *uprobe;
-
- uprobe = find_uprobe(inode, offset);
- if (WARN_ON(!uprobe))
- return;
-
- down_write(&uprobe->register_rwsem);
- __uprobe_unregister(uprobe, uc);
- up_write(&uprobe->register_rwsem);
- put_uprobe(uprobe);
-}
-EXPORT_SYMBOL_GPL(uprobe_unregister);
-
static int unapply_uprobe(struct uprobe *uprobe, struct mm_struct *mm)
{
struct vm_area_struct *vma;
--
2.18.0
^ permalink raw reply related [flat|nested] 3+ messages in thread* [for-next][PATCH 2/2] Uprobe: Additional argument arch_uprobe to uprobe_write_opcode()
2018-08-14 15:28 [for-next][PATCH 0/2] tracing: A couple of uprobe updates for 4.19 Steven Rostedt
2018-08-14 15:28 ` [for-next][PATCH 1/2] Uprobes: Simplify uprobe_register() body Steven Rostedt
@ 2018-08-14 15:28 ` Steven Rostedt
1 sibling, 0 replies; 3+ messages in thread
From: Steven Rostedt @ 2018-08-14 15:28 UTC (permalink / raw)
To: linux-kernel
Cc: Ingo Molnar, Andrew Morton, Song Liu, Srikar Dronamraju, Ravi Bangoria
From: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
Add addition argument 'arch_uprobe' to uprobe_write_opcode().
We need this in later set of patches.
Link: http://lkml.kernel.org/r/20180809041856.1547-3-ravi.bangoria@linux.ibm.com
Reviewed-by: Song Liu <songliubraving@fb.com>
Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
arch/arm/probes/uprobes/core.c | 2 +-
arch/mips/kernel/uprobes.c | 2 +-
include/linux/uprobes.h | 2 +-
kernel/events/uprobes.c | 9 +++++----
4 files changed, 8 insertions(+), 7 deletions(-)
diff --git a/arch/arm/probes/uprobes/core.c b/arch/arm/probes/uprobes/core.c
index d1329f1ba4e4..bf992264060e 100644
--- a/arch/arm/probes/uprobes/core.c
+++ b/arch/arm/probes/uprobes/core.c
@@ -32,7 +32,7 @@ bool is_swbp_insn(uprobe_opcode_t *insn)
int set_swbp(struct arch_uprobe *auprobe, struct mm_struct *mm,
unsigned long vaddr)
{
- return uprobe_write_opcode(mm, vaddr,
+ return uprobe_write_opcode(auprobe, mm, vaddr,
__opcode_to_mem_arm(auprobe->bpinsn));
}
diff --git a/arch/mips/kernel/uprobes.c b/arch/mips/kernel/uprobes.c
index f7a0645ccb82..4aaff3b3175c 100644
--- a/arch/mips/kernel/uprobes.c
+++ b/arch/mips/kernel/uprobes.c
@@ -224,7 +224,7 @@ unsigned long arch_uretprobe_hijack_return_addr(
int __weak set_swbp(struct arch_uprobe *auprobe, struct mm_struct *mm,
unsigned long vaddr)
{
- return uprobe_write_opcode(mm, vaddr, UPROBE_SWBP_INSN);
+ return uprobe_write_opcode(auprobe, mm, vaddr, UPROBE_SWBP_INSN);
}
void arch_uprobe_copy_ixol(struct page *page, unsigned long vaddr,
diff --git a/include/linux/uprobes.h b/include/linux/uprobes.h
index 0a294e950df8..bb9d2084af03 100644
--- a/include/linux/uprobes.h
+++ b/include/linux/uprobes.h
@@ -121,7 +121,7 @@ extern bool is_swbp_insn(uprobe_opcode_t *insn);
extern bool is_trap_insn(uprobe_opcode_t *insn);
extern unsigned long uprobe_get_swbp_addr(struct pt_regs *regs);
extern unsigned long uprobe_get_trap_addr(struct pt_regs *regs);
-extern int uprobe_write_opcode(struct mm_struct *mm, unsigned long vaddr, uprobe_opcode_t);
+extern int uprobe_write_opcode(struct arch_uprobe *auprobe, struct mm_struct *mm, unsigned long vaddr, uprobe_opcode_t);
extern int uprobe_register(struct inode *inode, loff_t offset, struct uprobe_consumer *uc);
extern int uprobe_apply(struct inode *inode, loff_t offset, struct uprobe_consumer *uc, bool);
extern void uprobe_unregister(struct inode *inode, loff_t offset, struct uprobe_consumer *uc);
diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index 471eac896635..c0418ba52ba8 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -299,8 +299,8 @@ static int verify_opcode(struct page *page, unsigned long vaddr, uprobe_opcode_t
* Called with mm->mmap_sem held for write.
* Return 0 (success) or a negative errno.
*/
-int uprobe_write_opcode(struct mm_struct *mm, unsigned long vaddr,
- uprobe_opcode_t opcode)
+int uprobe_write_opcode(struct arch_uprobe *auprobe, struct mm_struct *mm,
+ unsigned long vaddr, uprobe_opcode_t opcode)
{
struct page *old_page, *new_page;
struct vm_area_struct *vma;
@@ -351,7 +351,7 @@ int uprobe_write_opcode(struct mm_struct *mm, unsigned long vaddr,
*/
int __weak set_swbp(struct arch_uprobe *auprobe, struct mm_struct *mm, unsigned long vaddr)
{
- return uprobe_write_opcode(mm, vaddr, UPROBE_SWBP_INSN);
+ return uprobe_write_opcode(auprobe, mm, vaddr, UPROBE_SWBP_INSN);
}
/**
@@ -366,7 +366,8 @@ int __weak set_swbp(struct arch_uprobe *auprobe, struct mm_struct *mm, unsigned
int __weak
set_orig_insn(struct arch_uprobe *auprobe, struct mm_struct *mm, unsigned long vaddr)
{
- return uprobe_write_opcode(mm, vaddr, *(uprobe_opcode_t *)&auprobe->insn);
+ return uprobe_write_opcode(auprobe, mm, vaddr,
+ *(uprobe_opcode_t *)&auprobe->insn);
}
static struct uprobe *get_uprobe(struct uprobe *uprobe)
--
2.18.0
^ permalink raw reply related [flat|nested] 3+ messages in thread