The patch titled
kprobes: kretprobes simplifications
has been removed from the -mm tree. Its filename was
kprobes-kretprobes-simplifcations.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
Subject: kprobes: kretprobes simplifications
From: Christoph Hellwig <[EMAIL PROTECTED]>
- consolidate duplicate code in all arch_prepare_kretprobe instances
into common code
- replace various odd helpers that use hlist_for_each_entry to get
the first elemenet of a list with either a hlist_for_each_entry_save
or an opencoded access to the first element in the caller
- inline add_rp_inst into it's only remaining caller
- use kretprobe_inst_table_head instead of opencoding it
Signed-off-by: Christoph Hellwig <[EMAIL PROTECTED]>
Cc: Prasanna S Panchamukhi <[EMAIL PROTECTED]>
Acked-by: Ananth N Mavinakayanahalli <[EMAIL PROTECTED]>
Cc: Anil S Keshavamurthy <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
---
arch/i386/kernel/kprobes.c | 17 ++------
arch/ia64/kernel/kprobes.c | 18 ++-------
arch/powerpc/kernel/kprobes.c | 17 ++------
arch/s390/kernel/kprobes.c | 18 ++-------
arch/x86_64/kernel/kprobes.c | 17 ++------
include/linux/kprobes.h | 5 +-
kernel/kprobes.c | 64 ++++++++++----------------------
7 files changed, 43 insertions(+), 113 deletions(-)
diff -puN arch/i386/kernel/kprobes.c~kprobes-kretprobes-simplifcations
arch/i386/kernel/kprobes.c
--- a/arch/i386/kernel/kprobes.c~kprobes-kretprobes-simplifcations
+++ a/arch/i386/kernel/kprobes.c
@@ -226,24 +226,15 @@ static void __kprobes prepare_singlestep
}
/* Called with kretprobe_lock held */
-void __kprobes arch_prepare_kretprobe(struct kretprobe *rp,
+void __kprobes arch_prepare_kretprobe(struct kretprobe_instance *ri,
struct pt_regs *regs)
{
unsigned long *sara = (unsigned long *)®s->esp;
- struct kretprobe_instance *ri;
+ ri->ret_addr = (kprobe_opcode_t *) *sara;
- if ((ri = get_free_rp_inst(rp)) != NULL) {
- ri->rp = rp;
- ri->task = current;
- ri->ret_addr = (kprobe_opcode_t *) *sara;
-
- /* Replace the return addr with trampoline addr */
- *sara = (unsigned long) &kretprobe_trampoline;
- add_rp_inst(ri);
- } else {
- rp->nmissed++;
- }
+ /* Replace the return addr with trampoline addr */
+ *sara = (unsigned long) &kretprobe_trampoline;
}
/*
diff -puN arch/ia64/kernel/kprobes.c~kprobes-kretprobes-simplifcations
arch/ia64/kernel/kprobes.c
--- a/arch/ia64/kernel/kprobes.c~kprobes-kretprobes-simplifcations
+++ a/arch/ia64/kernel/kprobes.c
@@ -465,23 +465,13 @@ int __kprobes trampoline_probe_handler(s
}
/* Called with kretprobe_lock held */
-void __kprobes arch_prepare_kretprobe(struct kretprobe *rp,
+void __kprobes arch_prepare_kretprobe(struct kretprobe_instance *ri,
struct pt_regs *regs)
{
- struct kretprobe_instance *ri;
+ ri->ret_addr = (kprobe_opcode_t *)regs->b0;
- if ((ri = get_free_rp_inst(rp)) != NULL) {
- ri->rp = rp;
- ri->task = current;
- ri->ret_addr = (kprobe_opcode_t *)regs->b0;
-
- /* Replace the return addr with trampoline addr */
- regs->b0 = ((struct fnptr *)kretprobe_trampoline)->ip;
-
- add_rp_inst(ri);
- } else {
- rp->nmissed++;
- }
+ /* Replace the return addr with trampoline addr */
+ regs->b0 = ((struct fnptr *)kretprobe_trampoline)->ip;
}
int __kprobes arch_prepare_kprobe(struct kprobe *p)
diff -puN arch/powerpc/kernel/kprobes.c~kprobes-kretprobes-simplifcations
arch/powerpc/kernel/kprobes.c
--- a/arch/powerpc/kernel/kprobes.c~kprobes-kretprobes-simplifcations
+++ a/arch/powerpc/kernel/kprobes.c
@@ -126,22 +126,13 @@ static void __kprobes set_current_kprobe
}
/* Called with kretprobe_lock held */
-void __kprobes arch_prepare_kretprobe(struct kretprobe *rp,
+void __kprobes arch_prepare_kretprobe(struct kretprobe_instance *ri,
struct pt_regs *regs)
{
- struct kretprobe_instance *ri;
+ ri->ret_addr = (kprobe_opcode_t *)regs->link;
- if ((ri = get_free_rp_inst(rp)) != NULL) {
- ri->rp = rp;
- ri->task = current;
- ri->ret_addr = (kprobe_opcode_t *)regs->link;
-
- /* Replace the return addr with trampoline addr */
- regs->link = (unsigned long)kretprobe_trampoline;
- add_rp_inst(ri);
- } else {
- rp->nmissed++;
- }
+ /* Replace the return addr with trampoline addr */
+ regs->link = (unsigned long)kretprobe_trampoline;
}
static int __kprobes kprobe_handler(struct pt_regs *regs)
diff -puN arch/s390/kernel/kprobes.c~kprobes-kretprobes-simplifcations
arch/s390/kernel/kprobes.c
--- a/arch/s390/kernel/kprobes.c~kprobes-kretprobes-simplifcations
+++ a/arch/s390/kernel/kprobes.c
@@ -271,23 +271,13 @@ static void __kprobes set_current_kprobe
}
/* Called with kretprobe_lock held */
-void __kprobes arch_prepare_kretprobe(struct kretprobe *rp,
+void __kprobes arch_prepare_kretprobe(struct kretprobe_instance *ri,
struct pt_regs *regs)
{
- struct kretprobe_instance *ri;
+ ri->ret_addr = (kprobe_opcode_t *) regs->gprs[14];
- if ((ri = get_free_rp_inst(rp)) != NULL) {
- ri->rp = rp;
- ri->task = current;
- ri->ret_addr = (kprobe_opcode_t *) regs->gprs[14];
-
- /* Replace the return addr with trampoline addr */
- regs->gprs[14] = (unsigned long)&kretprobe_trampoline;
-
- add_rp_inst(ri);
- } else {
- rp->nmissed++;
- }
+ /* Replace the return addr with trampoline addr */
+ regs->gprs[14] = (unsigned long)&kretprobe_trampoline;
}
static int __kprobes kprobe_handler(struct pt_regs *regs)
diff -puN arch/x86_64/kernel/kprobes.c~kprobes-kretprobes-simplifcations
arch/x86_64/kernel/kprobes.c
--- a/arch/x86_64/kernel/kprobes.c~kprobes-kretprobes-simplifcations
+++ a/arch/x86_64/kernel/kprobes.c
@@ -266,23 +266,14 @@ static void __kprobes prepare_singlestep
}
/* Called with kretprobe_lock held */
-void __kprobes arch_prepare_kretprobe(struct kretprobe *rp,
+void __kprobes arch_prepare_kretprobe(struct kretprobe_instance *ri,
struct pt_regs *regs)
{
unsigned long *sara = (unsigned long *)regs->rsp;
- struct kretprobe_instance *ri;
- if ((ri = get_free_rp_inst(rp)) != NULL) {
- ri->rp = rp;
- ri->task = current;
- ri->ret_addr = (kprobe_opcode_t *) *sara;
-
- /* Replace the return addr with trampoline addr */
- *sara = (unsigned long) &kretprobe_trampoline;
- add_rp_inst(ri);
- } else {
- rp->nmissed++;
- }
+ ri->ret_addr = (kprobe_opcode_t *) *sara;
+ /* Replace the return addr with trampoline addr */
+ *sara = (unsigned long) &kretprobe_trampoline;
}
int __kprobes kprobe_handler(struct pt_regs *regs)
diff -puN include/linux/kprobes.h~kprobes-kretprobes-simplifcations
include/linux/kprobes.h
--- a/include/linux/kprobes.h~kprobes-kretprobes-simplifcations
+++ a/include/linux/kprobes.h
@@ -123,7 +123,8 @@ DECLARE_PER_CPU(struct kprobe *, current
DECLARE_PER_CPU(struct kprobe_ctlblk, kprobe_ctlblk);
#ifdef ARCH_SUPPORTS_KRETPROBES
-extern void arch_prepare_kretprobe(struct kretprobe *rp, struct pt_regs *regs);
+extern void arch_prepare_kretprobe(struct kretprobe_instance *ri,
+ struct pt_regs *regs);
#else /* ARCH_SUPPORTS_KRETPROBES */
static inline void arch_prepare_kretprobe(struct kretprobe *rp,
struct pt_regs *regs)
@@ -209,8 +210,6 @@ void jprobe_return(void);
int register_kretprobe(struct kretprobe *rp);
void unregister_kretprobe(struct kretprobe *rp);
-struct kretprobe_instance *get_free_rp_inst(struct kretprobe *rp);
-void add_rp_inst(struct kretprobe_instance *ri);
void kprobe_flush_task(struct task_struct *tk);
void recycle_rp_inst(struct kretprobe_instance *ri, struct hlist_head *head);
#else /* CONFIG_KPROBES */
diff -puN kernel/kprobes.c~kprobes-kretprobes-simplifcations kernel/kprobes.c
--- a/kernel/kprobes.c~kprobes-kretprobes-simplifcations
+++ a/kernel/kprobes.c
@@ -358,46 +358,6 @@ void __kprobes kprobes_inc_nmissed_count
}
/* Called with kretprobe_lock held */
-struct kretprobe_instance __kprobes *get_free_rp_inst(struct kretprobe *rp)
-{
- struct hlist_node *node;
- struct kretprobe_instance *ri;
- hlist_for_each_entry(ri, node, &rp->free_instances, uflist)
- return ri;
- return NULL;
-}
-
-/* Called with kretprobe_lock held */
-static struct kretprobe_instance __kprobes *get_used_rp_inst(struct kretprobe
- *rp)
-{
- struct hlist_node *node;
- struct kretprobe_instance *ri;
- hlist_for_each_entry(ri, node, &rp->used_instances, uflist)
- return ri;
- return NULL;
-}
-
-/* Called with kretprobe_lock held */
-void __kprobes add_rp_inst(struct kretprobe_instance *ri)
-{
- /*
- * Remove rp inst off the free list -
- * Add it back when probed function returns
- */
- hlist_del(&ri->uflist);
-
- /* Add rp inst onto table */
- INIT_HLIST_NODE(&ri->hlist);
- hlist_add_head(&ri->hlist,
- &kretprobe_inst_table[hash_ptr(ri->task,
KPROBE_HASH_BITS)]);
-
- /* Also add this rp inst to the used list. */
- INIT_HLIST_NODE(&ri->uflist);
- hlist_add_head(&ri->uflist, &ri->rp->used_instances);
-}
-
-/* Called with kretprobe_lock held */
void __kprobes recycle_rp_inst(struct kretprobe_instance *ri,
struct hlist_head *head)
{
@@ -450,7 +410,9 @@ void __kprobes kprobe_flush_task(struct
static inline void free_rp_inst(struct kretprobe *rp)
{
struct kretprobe_instance *ri;
- while ((ri = get_free_rp_inst(rp)) != NULL) {
+ struct hlist_node *pos, *next;
+
+ hlist_for_each_entry_safe(ri, pos, next, &rp->free_instances, uflist) {
hlist_del(&ri->uflist);
kfree(ri);
}
@@ -732,7 +694,21 @@ static int __kprobes pre_handler_kretpro
/*TODO: consider to only swap the RA after the last pre_handler fired */
spin_lock_irqsave(&kretprobe_lock, flags);
- arch_prepare_kretprobe(rp, regs);
+ if (!hlist_empty(&rp->free_instances)) {
+ struct kretprobe_instance *ri;
+
+ ri = hlist_entry(rp->free_instances.first,
+ struct kretprobe_instance, uflist);
+ ri->rp = rp;
+ ri->task = current;
+ arch_prepare_kretprobe(ri, regs);
+
+ /* XXX(hch): why is there no hlist_move_head? */
+ hlist_del(&ri->uflist);
+ hlist_add_head(&ri->uflist, &ri->rp->used_instances);
+ hlist_add_head(&ri->hlist, kretprobe_inst_table_head(ri->task));
+ } else
+ rp->nmissed++;
spin_unlock_irqrestore(&kretprobe_lock, flags);
return 0;
}
@@ -795,11 +771,13 @@ void __kprobes unregister_kretprobe(stru
{
unsigned long flags;
struct kretprobe_instance *ri;
+ struct hlist_node *pos, *next;
unregister_kprobe(&rp->kp);
+
/* No race here */
spin_lock_irqsave(&kretprobe_lock, flags);
- while ((ri = get_used_rp_inst(rp)) != NULL) {
+ hlist_for_each_entry_safe(ri, pos, next, &rp->used_instances, uflist) {
ri->rp = NULL;
hlist_del(&ri->uflist);
}
_
Patches currently in -mm which might be from [EMAIL PROTECTED] are
origin.patch
dont-force-uclinux-mtd-map-to-be-root-dev.patch
git-scsi-misc.patch
knfsd-trivial-makefile-cleanup.patch
aio-is-unlikely.patch
revoke-special-mmap-handling.patch
revoke-core-code.patch
revoke-support-for-ext2-and-ext3.patch
revoke-add-documentation.patch
revoke-wire-up-i386-system-calls.patch
unprivileged-mounts-add-user-mounts-to-the-kernel.patch
unprivileged-mounts-allow-unprivileged-umount.patch
unprivileged-mounts-account-user-mounts.patch
unprivileged-mounts-propagate-error-values-from-clone_mnt.patch
unprivileged-mounts-allow-unprivileged-bind-mounts.patch
unprivileged-mounts-put-declaration-of-put_filesystem-in-fsh.patch
unprivileged-mounts-allow-unprivileged-mounts.patch
unprivileged-mounts-allow-unprivileged-fuse-mounts.patch
unprivileged-mounts-propagation-inherit-owner-from-parent.patch
unprivileged-mounts-add-no-submounts-flag.patch
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