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bpf: Use migrate_disable/enable in array macros and cgroup/lirc code. 

Replace the preemption disable/enable with migrate_disable/enable() to
reflect the actual requirement and to allow PREEMPT_RT to substitute it
with an actual migration disable mechanism which does not disable
preemption.

Including the code paths that go via __bpf_prog_run_save_cb().

Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
This commit is contained in:
David Miller 2020-02-24 15:01:46 +01:00 committed by Alibek Omarov
parent 8884961ecd
commit 01b782ec6a
2 changed files with 7 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
include/linux/bpf.h
View File

@ -541,7 +541,7 @@ int bpf_prog_array_copy(struct bpf_prog_array *old_array,
struct bpf_prog *_prog; \
struct bpf_prog_array *_array; \
u32 _ret = 1; \
preempt_disable(); \
migrate_disable(); \
rcu_read_lock(); \
_array = rcu_dereference(array); \
if (unlikely(check_non_null && !_array))\
@ -555,7 +555,7 @@ int bpf_prog_array_copy(struct bpf_prog_array *old_array,
} \
_out: \
rcu_read_unlock(); \
preempt_enable(); \
migrate_enable(); \
_ret; \
})
@ -589,7 +589,7 @@ _out: \
u32 ret; \
u32 _ret = 1; \
u32 _cn = 0; \
preempt_disable(); \
migrate_disable(); \
rcu_read_lock(); \
_array = rcu_dereference(array); \
_item = &_array->items[0]; \
@ -601,7 +601,7 @@ _out: \
_item++; \
} \
rcu_read_unlock(); \
preempt_enable(); \
migrate_enable(); \
if (_ret) \
_ret = (_cn ? NET_XMIT_CN : NET_XMIT_SUCCESS); \
else \

5
include/linux/filter.h
View File

@ -684,6 +684,7 @@ static inline u8 *bpf_skb_cb(struct sk_buff *skb)
return qdisc_skb_cb(skb)->data;
}
/* Must be invoked with migration disabled */
static inline u32 __bpf_prog_run_save_cb(const struct bpf_prog *prog,
struct sk_buff *skb)
{
@ -709,9 +710,9 @@ static inline u32 bpf_prog_run_save_cb(const struct bpf_prog *prog,
{
u32 res;
preempt_disable();
migrate_disable();
res = __bpf_prog_run_save_cb(prog, skb);
preempt_enable();
migrate_enable();
return res;
}