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ARM: net: bpf: clarify tail_call index 

As per 90caccdd8c ("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: 39c13c204b ("arm: eBPF JIT compiler")
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
This commit is contained in:
Russell King 2018-01-13 12:11:26 +00:00
parent ec19e02b34
commit 091f02483d
1 changed files with 1 additions and 1 deletions
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2
arch/arm/net/bpf_jit_32.c
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@ -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);