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| author | Rodrigo Vivi <rodrigo.vivi@intel.com> | 2021-01-08 06:03:51 -0500 |
|---|---|---|
| committer | Rodrigo Vivi <rodrigo.vivi@intel.com> | 2021-01-08 06:03:51 -0500 |
| commit | 10205618052908770451acd33eaeaa7685e97ed2 (patch) | |
| tree | 4d025943e32f343fa917db7abed8a606faa17775 /kernel/livepatch | |
| parent | 6fdb335f1c9c0845b50625de1624d8445c4c4a07 (diff) | |
| parent | cb3cfbf79aff7decb4e5ee69a7c74864497f61dc (diff) | |
| download | cachepc-linux-10205618052908770451acd33eaeaa7685e97ed2.tar.gz cachepc-linux-10205618052908770451acd33eaeaa7685e97ed2.zip | |
Merge drm/drm-next into drm-intel-next
sync-up to not fall too much behind.
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Diffstat (limited to 'kernel/livepatch')
| -rw-r--r-- | kernel/livepatch/Kconfig | 2 | ||||
| -rw-r--r-- | kernel/livepatch/patch.c | 15 |
2 files changed, 12 insertions, 5 deletions
diff --git a/kernel/livepatch/Kconfig b/kernel/livepatch/Kconfig index 54102deb50ba..53d51ed619a3 100644 --- a/kernel/livepatch/Kconfig +++ b/kernel/livepatch/Kconfig @@ -6,7 +6,7 @@ config HAVE_LIVEPATCH config LIVEPATCH bool "Kernel Live Patching" - depends on DYNAMIC_FTRACE_WITH_REGS + depends on DYNAMIC_FTRACE_WITH_REGS || DYNAMIC_FTRACE_WITH_ARGS depends on MODULES depends on SYSFS depends on KALLSYMS_ALL diff --git a/kernel/livepatch/patch.c b/kernel/livepatch/patch.c index b552cf2d85f8..e8029aea67f1 100644 --- a/kernel/livepatch/patch.c +++ b/kernel/livepatch/patch.c @@ -40,14 +40,18 @@ struct klp_ops *klp_find_ops(void *old_func) static void notrace klp_ftrace_handler(unsigned long ip, unsigned long parent_ip, struct ftrace_ops *fops, - struct pt_regs *regs) + struct ftrace_regs *fregs) { struct klp_ops *ops; struct klp_func *func; int patch_state; + int bit; ops = container_of(fops, struct klp_ops, fops); + bit = ftrace_test_recursion_trylock(ip, parent_ip); + if (WARN_ON_ONCE(bit < 0)) + return; /* * A variant of synchronize_rcu() is used to allow patching functions * where RCU is not watching, see klp_synchronize_transition(). @@ -113,10 +117,11 @@ static void notrace klp_ftrace_handler(unsigned long ip, if (func->nop) goto unlock; - klp_arch_set_pc(regs, (unsigned long)func->new_func); + klp_arch_set_pc(fregs, (unsigned long)func->new_func); unlock: preempt_enable_notrace(); + ftrace_test_recursion_unlock(bit); } /* @@ -194,8 +199,10 @@ static int klp_patch_func(struct klp_func *func) return -ENOMEM; ops->fops.func = klp_ftrace_handler; - ops->fops.flags = FTRACE_OPS_FL_SAVE_REGS | - FTRACE_OPS_FL_DYNAMIC | + ops->fops.flags = FTRACE_OPS_FL_DYNAMIC | +#ifndef CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS + FTRACE_OPS_FL_SAVE_REGS | +#endif FTRACE_OPS_FL_IPMODIFY | FTRACE_OPS_FL_PERMANENT; |