It doesn't make any sense to have 2 versions of _register(). Note that
trace_uprobe_enable(), the only user of uprobe_register(), doesn't need
to check tu->ref_ctr_offset to decide which one should be used, it could
safely pass ref_ctr_offset == 0 to uprobe_register_refctr().
Add this argument to uprobe_register(), update the callers, and kill
uprobe_register_refctr().
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
---
include/linux/uprobes.h | 9 ++-------
kernel/events/uprobes.c | 23 +++++------------------
kernel/trace/bpf_trace.c | 2 +-
kernel/trace/trace_uprobe.c | 8 ++------
4 files changed, 10 insertions(+), 32 deletions(-)
diff --git a/include/linux/uprobes.h b/include/linux/uprobes.h
index f46e0ca0169c..aa89a8b67039 100644
--- a/include/linux/uprobes.h
+++ b/include/linux/uprobes.h
@@ -110,8 +110,7 @@ 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 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_register_refctr(struct inode *inode, loff_t offset, loff_t ref_ctr_offset, struct uprobe_consumer *uc);
+extern int uprobe_register(struct inode *inode, loff_t offset, loff_t ref_ctr_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);
extern int uprobe_mmap(struct vm_area_struct *vma);
@@ -149,11 +148,7 @@ static inline void uprobes_init(void)
#define uprobe_get_trap_addr(regs) instruction_pointer(regs)
static inline int
-uprobe_register(struct inode *inode, loff_t offset, struct uprobe_consumer *uc)
-{
- return -ENOSYS;
-}
-static inline int uprobe_register_refctr(struct inode *inode, loff_t offset, loff_t ref_ctr_offset, struct uprobe_consumer *uc)
+uprobe_register(struct inode *inode, loff_t offset, loff_t ref_ctr_offset, struct uprobe_consumer *uc)
{
return -ENOSYS;
}
diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index 1bdf386485d4..4950decebe5c 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -1120,25 +1120,25 @@ void uprobe_unregister(struct inode *inode, loff_t offset, struct uprobe_consume
EXPORT_SYMBOL_GPL(uprobe_unregister);
/*
- * __uprobe_register - register a probe
+ * 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)
*/
-static int __uprobe_register(struct inode *inode, loff_t offset,
- loff_t ref_ctr_offset, struct uprobe_consumer *uc)
+int uprobe_register(struct inode *inode, loff_t offset, loff_t ref_ctr_offset,
+ struct uprobe_consumer *uc)
{
struct uprobe *uprobe;
int ret;
@@ -1190,21 +1190,8 @@ static int __uprobe_register(struct inode *inode, loff_t offset,
goto retry;
return ret;
}
-
-int uprobe_register(struct inode *inode, loff_t offset,
- struct uprobe_consumer *uc)
-{
- return __uprobe_register(inode, offset, 0, uc);
-}
EXPORT_SYMBOL_GPL(uprobe_register);
-int uprobe_register_refctr(struct inode *inode, loff_t offset,
- loff_t ref_ctr_offset, struct uprobe_consumer *uc)
-{
- return __uprobe_register(inode, offset, ref_ctr_offset, uc);
-}
-EXPORT_SYMBOL_GPL(uprobe_register_refctr);
-
/*
* uprobe_apply - unregister an already registered probe.
* @inode: the file in which the probe has to be removed.
diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
index d1daeab1bbc1..467f358c8ce7 100644
--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c
@@ -3477,7 +3477,7 @@ int bpf_uprobe_multi_link_attach(const union bpf_attr *attr, struct bpf_prog *pr
&bpf_uprobe_multi_link_lops, prog);
for (i = 0; i < cnt; i++) {
- err = uprobe_register_refctr(d_real_inode(link->path.dentry),
+ err = uprobe_register(d_real_inode(link->path.dentry),
uprobes[i].offset,
uprobes[i].ref_ctr_offset,
&uprobes[i].consumer);
diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
index c98e3b3386ba..78a5c40e885a 100644
--- a/kernel/trace/trace_uprobe.c
+++ b/kernel/trace/trace_uprobe.c
@@ -1089,12 +1089,8 @@ static int trace_uprobe_enable(struct trace_uprobe *tu, filter_func_t filter)
tu->consumer.filter = filter;
tu->inode = d_real_inode(tu->path.dentry);
- if (tu->ref_ctr_offset)
- ret = uprobe_register_refctr(tu->inode, tu->offset,
- tu->ref_ctr_offset, &tu->consumer);
- else
- ret = uprobe_register(tu->inode, tu->offset, &tu->consumer);
-
+ ret = uprobe_register(tu->inode, tu->offset, tu->ref_ctr_offset,
+ &tu->consumer);
if (ret)
tu->inode = NULL;
--
2.25.1.362.g51ebf55On Wed, Jul 10, 2024 at 9:32 AM Oleg Nesterov <oleg@redhat.com> wrote:
>
> It doesn't make any sense to have 2 versions of _register(). Note that
> trace_uprobe_enable(), the only user of uprobe_register(), doesn't need
> to check tu->ref_ctr_offset to decide which one should be used, it could
> safely pass ref_ctr_offset == 0 to uprobe_register_refctr().
>
> Add this argument to uprobe_register(), update the callers, and kill
> uprobe_register_refctr().
>
> Signed-off-by: Oleg Nesterov <oleg@redhat.com>
> ---
> include/linux/uprobes.h | 9 ++-------
> kernel/events/uprobes.c | 23 +++++------------------
> kernel/trace/bpf_trace.c | 2 +-
> kernel/trace/trace_uprobe.c | 8 ++------
> 4 files changed, 10 insertions(+), 32 deletions(-)
>
LGTM with few nits below.
Acked-by: Andrii Nakryiko <andrii@kernel.org>
> /*
> * uprobe_apply - unregister an already registered probe.
> * @inode: the file in which the probe has to be removed.
> diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
> index d1daeab1bbc1..467f358c8ce7 100644
> --- a/kernel/trace/bpf_trace.c
> +++ b/kernel/trace/bpf_trace.c
> @@ -3477,7 +3477,7 @@ int bpf_uprobe_multi_link_attach(const union bpf_attr *attr, struct bpf_prog *pr
> &bpf_uprobe_multi_link_lops, prog);
>
> for (i = 0; i < cnt; i++) {
> - err = uprobe_register_refctr(d_real_inode(link->path.dentry),
> + err = uprobe_register(d_real_inode(link->path.dentry),
> uprobes[i].offset,
> uprobes[i].ref_ctr_offset,
> &uprobes[i].consumer);
please adjust indentation here
> diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
> index c98e3b3386ba..78a5c40e885a 100644
> --- a/kernel/trace/trace_uprobe.c
> +++ b/kernel/trace/trace_uprobe.c
> @@ -1089,12 +1089,8 @@ static int trace_uprobe_enable(struct trace_uprobe *tu, filter_func_t filter)
> tu->consumer.filter = filter;
> tu->inode = d_real_inode(tu->path.dentry);
>
> - if (tu->ref_ctr_offset)
> - ret = uprobe_register_refctr(tu->inode, tu->offset,
> - tu->ref_ctr_offset, &tu->consumer);
> - else
> - ret = uprobe_register(tu->inode, tu->offset, &tu->consumer);
> -
> + ret = uprobe_register(tu->inode, tu->offset, tu->ref_ctr_offset,
> + &tu->consumer);
doesn't fit under 100 characters? If it does, please keep as a single line.
> if (ret)
> tu->inode = NULL;
>
> --
> 2.25.1.362.g51ebf55
>
>
On 07/10, Andrii Nakryiko wrote:
>
> LGTM with few nits below.
>
> Acked-by: Andrii Nakryiko <andrii@kernel.org>
Thanks for looking at this.
> > @@ -3477,7 +3477,7 @@ int bpf_uprobe_multi_link_attach(const union bpf_attr *attr, struct bpf_prog *pr
> > &bpf_uprobe_multi_link_lops, prog);
> >
> > for (i = 0; i < cnt; i++) {
> > - err = uprobe_register_refctr(d_real_inode(link->path.dentry),
> > + err = uprobe_register(d_real_inode(link->path.dentry),
> > uprobes[i].offset,
> > uprobes[i].ref_ctr_offset,
> > &uprobes[i].consumer);
>
> please adjust indentation here
OK,
> > - if (tu->ref_ctr_offset)
> > - ret = uprobe_register_refctr(tu->inode, tu->offset,
> > - tu->ref_ctr_offset, &tu->consumer);
> > - else
> > - ret = uprobe_register(tu->inode, tu->offset, &tu->consumer);
> > -
> > + ret = uprobe_register(tu->inode, tu->offset, tu->ref_ctr_offset,
> > + &tu->consumer);
>
> doesn't fit under 100 characters? If it does, please keep as a single line.
OK, will do.
Oleg.
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