AcoSail/kernel_optimize_test
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uprobes: Do not setup ->active_uprobe/state prematurely

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handle_swbp() sets utask->active_uprobe before handler_chain(),
and UTASK_SSTEP before pre_ssout(). This complicates the code
for no reason,  arch_ hooks or consumer->handler() should not
(and can't) use this info.

Change handle_swbp() to initialize them after pre_ssout(), and
remove the no longer needed cleanup-utask code.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
cked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
This commit is contained in:
Oleg Nesterov 2012-09-14 18:23:51 +02:00
parent 79d54b249c
commit 746a9e6ba2
1 changed files with 3 additions and 6 deletions
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9
kernel/events/uprobes.c
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@ -1496,22 +1496,19 @@ static void handle_swbp(struct pt_regs *regs)
if (!utask)
goto cleanup_ret;
}
utask->active_uprobe = uprobe;
handler_chain(uprobe, regs);
if (uprobe->flags & UPROBE_SKIP_SSTEP && can_skip_sstep(uprobe, regs))
goto cleanup_ret;
utask->state = UTASK_SSTEP;
if (!pre_ssout(uprobe, regs, bp_vaddr)) {
arch_uprobe_enable_step(&uprobe->arch);
utask->active_uprobe = uprobe;
utask->state = UTASK_SSTEP;
return;
}
cleanup_ret:
if (utask) {
utask->active_uprobe = NULL;
utask->state = UTASK_RUNNING;
}
if (!(uprobe->flags & UPROBE_SKIP_SSTEP))
/*