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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2013-10-04 11:12:16 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2013-10-24 17:16:59 +0200
commit6cef30034c32ebe448c844089c4168c411feeb63 (patch)
tree618a8ed3f69e1c3298d0c50342782e2c7f0387fa /arch/s390/net
parent12325f097898c120c6cd89797aae97836783b5ef (diff)
downloadlinux-6cef30034c32ebe448c844089c4168c411feeb63.tar.gz
s390/bpf,jit: fix prolog oddity
The prolog of functions generated by the bpf jit compiler uses an instruction sequence with an "ahi" instruction to create stack space instead of using an "aghi" instruction. Using the 32-bit "ahi" is not wrong as the stack we are operating on is an order-4 allocation which is always aligned to 16KB. But it is more consistent to use an "aghi" as the stack pointer is a 64-bit value. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/net')
-rw-r--r--arch/s390/net/bpf_jit_comp.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/s390/net/bpf_jit_comp.c b/arch/s390/net/bpf_jit_comp.c
index 49425ca801d5..16871da37371 100644
--- a/arch/s390/net/bpf_jit_comp.c
+++ b/arch/s390/net/bpf_jit_comp.c
@@ -156,8 +156,8 @@ static void bpf_jit_prologue(struct bpf_jit *jit)
EMIT6(0xeb8ff058, 0x0024);
/* lgr %r14,%r15 */
EMIT4(0xb90400ef);
- /* ahi %r15,<offset> */
- EMIT4_IMM(0xa7fa0000, (jit->seen & SEEN_MEM) ? -112 : -80);
+ /* aghi %r15,<offset> */
+ EMIT4_IMM(0xa7fb0000, (jit->seen & SEEN_MEM) ? -112 : -80);
/* stg %r14,152(%r15) */
EMIT6(0xe3e0f098, 0x0024);
} else if ((jit->seen & SEEN_XREG) && (jit->seen & SEEN_LITERAL))