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| author | Michael Holzheu <holzheu@linux.vnet.ibm.com> | 2017-11-07 19:16:25 +0100 |
|---|---|---|
| committer | Heiko Carstens <heiko.carstens@de.ibm.com> | 2017-11-10 18:57:37 +0100 |
| commit | 78372709bf95c2ef5c886780efc268f7f052168a (patch) | |
| tree | 11f908545f711b32ab60a2dd2ce2f749c1b26f44 /arch/s390/net/bpf_jit.h | |
| parent | 22841cea1a10832d07f16720c718f6795f35fe2a (diff) | |
| download | linux-78372709bf95c2ef5c886780efc268f7f052168a.tar.gz linux-78372709bf95c2ef5c886780efc268f7f052168a.tar.bz2 linux-78372709bf95c2ef5c886780efc268f7f052168a.zip | |
s390/bpf: take advantage of stack_depth tracking
Make use of the "stack_depth" tracking feature introduced with
commit 8726679a0fa31 ("bpf: teach verifier to track stack depth") for the
s390 JIT, so that stack usage can be reduced.
Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Diffstat (limited to 'arch/s390/net/bpf_jit.h')
| -rw-r--r-- | arch/s390/net/bpf_jit.h | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/arch/s390/net/bpf_jit.h b/arch/s390/net/bpf_jit.h index fda605dbc1b4..5057728b300e 100644 --- a/arch/s390/net/bpf_jit.h +++ b/arch/s390/net/bpf_jit.h @@ -52,10 +52,13 @@ extern u8 sk_load_word[], sk_load_half[], sk_load_byte[]; * * We get 160 bytes stack space from calling function, but only use * 12 * 8 byte for old backchain, r15..r6, and tail_call_cnt. + * + * The stack size used by the BPF program ("BPF stack" above) is passed + * via "aux->stack_depth". */ -#define STK_SPACE (MAX_BPF_STACK + 8 + 8 + 4 + 4 + 160) +#define STK_SPACE_ADD (8 + 8 + 4 + 4 + 160) #define STK_160_UNUSED (160 - 12 * 8) -#define STK_OFF (STK_SPACE - STK_160_UNUSED) +#define STK_OFF (STK_SPACE_ADD - STK_160_UNUSED) #define STK_OFF_TMP 160 /* Offset of tmp buffer on stack */ #define STK_OFF_HLEN 168 /* Offset of SKB header length on stack */ #define STK_OFF_SKBP 176 /* Offset of SKB pointer on stack */ |