[patch 07/24] Text Edit Lock - kprobes architecture independent support
Use the mutual exclusion provided by the text edit lock in the kprobes code. It allows coherent manipulation of the kernel code by other subsystems. Changelog: Move the kernel_text_lock/unlock out of the for loops. Signed-off-by: Mathieu Desnoyers <[EMAIL PROTECTED]> Acked-by: Ananth N Mavinakayanahalli <[EMAIL PROTECTED]> CC: [EMAIL PROTECTED] CC: [EMAIL PROTECTED] CC: [EMAIL PROTECTED] CC: [EMAIL PROTECTED] CC: Roel Kluin <[EMAIL PROTECTED]> --- kernel/kprobes.c | 19 +-- 1 file changed, 13 insertions(+), 6 deletions(-) Index: linux-2.6-lttng/kernel/kprobes.c === --- linux-2.6-lttng.orig/kernel/kprobes.c 2007-11-16 13:40:06.0 -0500 +++ linux-2.6-lttng/kernel/kprobes.c2007-11-17 10:00:23.0 -0500 @@ -43,6 +43,7 @@ #include #include #include +#include #include #include @@ -568,9 +569,10 @@ static int __kprobes __register_kprobe(s goto out; } + kernel_text_lock(); ret = arch_prepare_kprobe(p); if (ret) - goto out; + goto out_unlock_text; INIT_HLIST_NODE(>hlist); hlist_add_head_rcu(>hlist, @@ -578,7 +580,8 @@ static int __kprobes __register_kprobe(s if (kprobe_enabled) arch_arm_kprobe(p); - +out_unlock_text: + kernel_text_unlock(); out: mutex_unlock(_mutex); @@ -621,8 +624,11 @@ valid_p: * enabled - otherwise, the breakpoint would already have * been removed. We save on flushing icache. */ - if (kprobe_enabled) + if (kprobe_enabled) { + kernel_text_lock(); arch_disarm_kprobe(p); + kernel_text_unlock(); + } hlist_del_rcu(_p->hlist); cleanup_p = 1; } else { @@ -644,9 +650,7 @@ valid_p: list_del_rcu(>list); kfree(old_p); } - mutex_lock(_mutex); arch_remove_kprobe(p); - mutex_unlock(_mutex); } else { mutex_lock(_mutex); if (p->break_handler) @@ -717,7 +721,6 @@ static int __kprobes pre_handler_kretpro ri->rp = rp; ri->task = current; arch_prepare_kretprobe(ri, regs); - /* XXX(hch): why is there no hlist_move_head? */ hlist_del(>uflist); hlist_add_head(>uflist, >rp->used_instances); @@ -938,11 +941,13 @@ static void __kprobes enable_all_kprobes if (kprobe_enabled) goto already_enabled; + kernel_text_lock(); for (i = 0; i < KPROBE_TABLE_SIZE; i++) { head = _table[i]; hlist_for_each_entry_rcu(p, node, head, hlist) arch_arm_kprobe(p); } + kernel_text_unlock(); kprobe_enabled = true; printk(KERN_INFO "Kprobes globally enabled\n"); @@ -967,6 +972,7 @@ static void __kprobes disable_all_kprobe kprobe_enabled = false; printk(KERN_INFO "Kprobes globally disabled\n"); + kernel_text_lock(); for (i = 0; i < KPROBE_TABLE_SIZE; i++) { head = _table[i]; hlist_for_each_entry_rcu(p, node, head, hlist) { @@ -974,6 +980,7 @@ static void __kprobes disable_all_kprobe arch_disarm_kprobe(p); } } + kernel_text_unlock(); mutex_unlock(_mutex); /* Allow all currently running kprobes to complete */ -- Mathieu Desnoyers Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
[patch 07/24] Text Edit Lock - kprobes architecture independent support
Use the mutual exclusion provided by the text edit lock in the kprobes code. It allows coherent manipulation of the kernel code by other subsystems. Changelog: Move the kernel_text_lock/unlock out of the for loops. Signed-off-by: Mathieu Desnoyers [EMAIL PROTECTED] Acked-by: Ananth N Mavinakayanahalli [EMAIL PROTECTED] CC: [EMAIL PROTECTED] CC: [EMAIL PROTECTED] CC: [EMAIL PROTECTED] CC: [EMAIL PROTECTED] CC: Roel Kluin [EMAIL PROTECTED] --- kernel/kprobes.c | 19 +-- 1 file changed, 13 insertions(+), 6 deletions(-) Index: linux-2.6-lttng/kernel/kprobes.c === --- linux-2.6-lttng.orig/kernel/kprobes.c 2007-11-16 13:40:06.0 -0500 +++ linux-2.6-lttng/kernel/kprobes.c2007-11-17 10:00:23.0 -0500 @@ -43,6 +43,7 @@ #include linux/seq_file.h #include linux/debugfs.h #include linux/kdebug.h +#include linux/memory.h #include asm-generic/sections.h #include asm/cacheflush.h @@ -568,9 +569,10 @@ static int __kprobes __register_kprobe(s goto out; } + kernel_text_lock(); ret = arch_prepare_kprobe(p); if (ret) - goto out; + goto out_unlock_text; INIT_HLIST_NODE(p-hlist); hlist_add_head_rcu(p-hlist, @@ -578,7 +580,8 @@ static int __kprobes __register_kprobe(s if (kprobe_enabled) arch_arm_kprobe(p); - +out_unlock_text: + kernel_text_unlock(); out: mutex_unlock(kprobe_mutex); @@ -621,8 +624,11 @@ valid_p: * enabled - otherwise, the breakpoint would already have * been removed. We save on flushing icache. */ - if (kprobe_enabled) + if (kprobe_enabled) { + kernel_text_lock(); arch_disarm_kprobe(p); + kernel_text_unlock(); + } hlist_del_rcu(old_p-hlist); cleanup_p = 1; } else { @@ -644,9 +650,7 @@ valid_p: list_del_rcu(p-list); kfree(old_p); } - mutex_lock(kprobe_mutex); arch_remove_kprobe(p); - mutex_unlock(kprobe_mutex); } else { mutex_lock(kprobe_mutex); if (p-break_handler) @@ -717,7 +721,6 @@ static int __kprobes pre_handler_kretpro 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); @@ -938,11 +941,13 @@ static void __kprobes enable_all_kprobes if (kprobe_enabled) goto already_enabled; + kernel_text_lock(); for (i = 0; i KPROBE_TABLE_SIZE; i++) { head = kprobe_table[i]; hlist_for_each_entry_rcu(p, node, head, hlist) arch_arm_kprobe(p); } + kernel_text_unlock(); kprobe_enabled = true; printk(KERN_INFO Kprobes globally enabled\n); @@ -967,6 +972,7 @@ static void __kprobes disable_all_kprobe kprobe_enabled = false; printk(KERN_INFO Kprobes globally disabled\n); + kernel_text_lock(); for (i = 0; i KPROBE_TABLE_SIZE; i++) { head = kprobe_table[i]; hlist_for_each_entry_rcu(p, node, head, hlist) { @@ -974,6 +980,7 @@ static void __kprobes disable_all_kprobe arch_disarm_kprobe(p); } } + kernel_text_unlock(); mutex_unlock(kprobe_mutex); /* Allow all currently running kprobes to complete */ -- Mathieu Desnoyers Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68 -- To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/