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authorRussell King <rmk+kernel@armlinux.org.uk>2018-01-13 12:11:26 +0000
committerRussell King <rmk+kernel@armlinux.org.uk>2018-01-17 19:39:10 +0000
commit091f02483df7b56615b524491f404e574c5e0668 (patch)
treecaafcf8aaad2b90c0ee983f87aee1b92bbb01c75 /arch/arm/net
parentec19e02b343db991d2d1610c409efefebf4e2ca9 (diff)
downloadlinux-091f02483df7b56615b524491f404e574c5e0668.tar.bz2
ARM: net: bpf: clarify tail_call index
As per 90caccdd8cc0 ("bpf: fix bpf_tail_call() x64 JIT"), the index used for array lookup is defined to be 32-bit wide. Update a misleading comment that suggests it is 64-bit wide. Fixes: 39c13c204bb1 ("arm: eBPF JIT compiler") Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Diffstat (limited to 'arch/arm/net')
-rw-r--r--arch/arm/net/bpf_jit_32.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm/net/bpf_jit_32.c b/arch/arm/net/bpf_jit_32.c
index 715e7250de86..323a4df59a6c 100644
--- a/arch/arm/net/bpf_jit_32.c
+++ b/arch/arm/net/bpf_jit_32.c
@@ -1016,7 +1016,7 @@ static int emit_bpf_tail_call(struct jit_ctx *ctx)
emit_a32_mov_i(tmp[1], off, false, ctx);
emit(ARM_LDR_I(tmp2[1], ARM_SP, STACK_VAR(r2[1])), ctx);
emit(ARM_LDR_R(tmp[1], tmp2[1], tmp[1]), ctx);
- /* index (64 bit) */
+ /* index is 32-bit for arrays */
emit(ARM_LDR_I(tmp2[1], ARM_SP, STACK_VAR(r3[1])), ctx);
/* index >= array->map.max_entries */
emit(ARM_CMP_R(tmp2[1], tmp[1]), ctx);