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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: 0546231057 ("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>
This commit is contained in:
Michael Holzheu 2015-07-29 21:15:15 +02:00 committed by David S. Miller
parent f75298f5c3
commit 1df03ffdde
1 changed files with 3 additions and 2 deletions
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5
arch/s390/net/bpf_jit_comp.c
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@ -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); \
})