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Commit 091f0248 authored by Russell King's avatar Russell King
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ARM: net: bpf: clarify tail_call index 



As per 90caccdd ("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: 39c13c20 ("arm: eBPF JIT compiler")
Signed-off-by: default avatarRussell King <rmk+kernel@armlinux.org.uk>
parent ec19e02b

arch/arm/net/bpf_jit_32.c

+1 −1
Original line number Diff line number Diff line
@@ -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);