diff options
Diffstat (limited to 'Documentation/bpf/kfuncs.rst')
| -rw-r--r-- | Documentation/bpf/kfuncs.rst | 21 |
1 files changed, 6 insertions, 15 deletions
diff --git a/Documentation/bpf/kfuncs.rst b/Documentation/bpf/kfuncs.rst index 3b42cfe12437..ea2516374d92 100644 --- a/Documentation/bpf/kfuncs.rst +++ b/Documentation/bpf/kfuncs.rst @@ -184,16 +184,7 @@ in. All copies of the pointer being released are invalidated as a result of invoking kfunc with this flag. KF_RELEASE kfuncs automatically receive the protection afforded by the KF_TRUSTED_ARGS flag described below. -2.4.4 KF_KPTR_GET flag ----------------------- - -The KF_KPTR_GET flag is used to indicate that the kfunc takes the first argument -as a pointer to kptr, safely increments the refcount of the object it points to, -and returns a reference to the user. The rest of the arguments may be normal -arguments of a kfunc. The KF_KPTR_GET flag should be used in conjunction with -KF_ACQUIRE and KF_RET_NULL flags. - -2.4.5 KF_TRUSTED_ARGS flag +2.4.4 KF_TRUSTED_ARGS flag -------------------------- The KF_TRUSTED_ARGS flag is used for kfuncs taking pointer arguments. It @@ -205,7 +196,7 @@ exception described below). There are two types of pointers to kernel objects which are considered "valid": 1. Pointers which are passed as tracepoint or struct_ops callback arguments. -2. Pointers which were returned from a KF_ACQUIRE or KF_KPTR_GET kfunc. +2. Pointers which were returned from a KF_ACQUIRE kfunc. Pointers to non-BTF objects (e.g. scalar pointers) may also be passed to KF_TRUSTED_ARGS kfuncs, and may have a non-zero offset. @@ -232,13 +223,13 @@ In other words, you must: 2. Specify the type and name of the trusted nested field. This field must match the field in the original type definition exactly. -2.4.6 KF_SLEEPABLE flag +2.4.5 KF_SLEEPABLE flag ----------------------- The KF_SLEEPABLE flag is used for kfuncs that may sleep. Such kfuncs can only be called by sleepable BPF programs (BPF_F_SLEEPABLE). -2.4.7 KF_DESTRUCTIVE flag +2.4.6 KF_DESTRUCTIVE flag -------------------------- The KF_DESTRUCTIVE flag is used to indicate functions calling which is @@ -247,7 +238,7 @@ rebooting or panicking. Due to this additional restrictions apply to these calls. At the moment they only require CAP_SYS_BOOT capability, but more can be added later. -2.4.8 KF_RCU flag +2.4.7 KF_RCU flag ----------------- The KF_RCU flag is a weaker version of KF_TRUSTED_ARGS. The kfuncs marked with @@ -260,7 +251,7 @@ also be KF_RET_NULL. .. _KF_deprecated_flag: -2.4.9 KF_DEPRECATED flag +2.4.8 KF_DEPRECATED flag ------------------------ The KF_DEPRECATED flag is used for kfuncs which are scheduled to be |