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| author | Michael Holzheu <holzheu@linux.vnet.ibm.com> | 2015-07-29 21:15:15 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-07-29 23:59:58 +0200 |
| commit | 1df03ffdded54fbb6507ef494ece071f3501410e (patch) | |
| tree | 9dda9a51a73d972b187254856893c2516d8f2b51 /arch | |
| parent | s390/bpf: clear correct BPF accumulator register (diff) | |
| download | linux-1df03ffdded54fbb6507ef494ece071f3501410e.tar.xz linux-1df03ffdded54fbb6507ef494ece071f3501410e.zip | |
s390/bpf: Fix multiple macro expansions
The EMIT6_DISP_LH macro passes the "disp" parameter to the _EMIT6_DISP_LH
macro. The _EMIT6_DISP_LH macro uses the "disp" parameter twice:
unsigned int __disp_h = ((u32)disp) & 0xff000;
unsigned int __disp_l = ((u32)disp) & 0x00fff;
The EMIT6_DISP_LH is used several times with EMIT_CONST_U64() as "disp"
parameter. Therefore always two constants are created per usage of
EMIT6_DISP_LH.
Fix this and add variable "_disp" to avoid multiple expansions.
* v2: Move "_disp" to _EMIT6_DISP_LH as suggested by Joe Perches
Fixes: 054623105728 ("s390/bpf: Add s390x eBPF JIT compiler backend")
Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/s390/net/bpf_jit_comp.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/arch/s390/net/bpf_jit_comp.c b/arch/s390/net/bpf_jit_comp.c index 01ad16608f66..66926ab244c1 100644 --- a/arch/s390/net/bpf_jit_comp.c +++ b/arch/s390/net/bpf_jit_comp.c @@ -214,8 +214,9 @@ static inline void reg_set_seen(struct bpf_jit *jit, u32 b1) #define _EMIT6_DISP_LH(op1, op2, disp) \ ({ \ - unsigned int __disp_h = ((u32)disp) & 0xff000; \ - unsigned int __disp_l = ((u32)disp) & 0x00fff; \ + u32 _disp = (u32) disp; \ + unsigned int __disp_h = _disp & 0xff000; \ + unsigned int __disp_l = _disp & 0x00fff; \ _EMIT6(op1 | __disp_l, op2 | __disp_h >> 4); \ }) |