linux-kernel - [PATCH] arm64: delete dead code in this_cpu_set

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Message-ID: <73859c9e-dea0-4764-bf01-7ae694fa2e37@kili.mountain>
Date:   Wed, 19 Apr 2023 10:58:43 +0300
From:   Dan Carpenter <dan.carpenter@...aro.org>
To:     James Morse <james.morse@....com>
Cc:     Will Deacon <will@...nel.org>,
        Kristina Martsenko <kristina.martsenko@....com>,
        Mark Rutland <mark.rutland@....com>,
        Mark Brown <broonie@...nel.org>,
        Ard Biesheuvel <ardb@...nel.org>,
        Liu Song <liusong@...ux.alibaba.com>,
        D Scott Phillips <scott@...amperecomputing.com>,
        James Morse <james.morse@....com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: [PATCH] arm64: delete dead code in this_cpu_set_vectors()

The "slot" variable is an enum, and in this context it is an unsigned
int.  So the type means it can never be negative and also we never pass
invalid data to this function.  If something did pass invalid data then
this check would be insufficient protection.

Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
---
 arch/arm64/kernel/proton-pack.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/arch/arm64/kernel/proton-pack.c b/arch/arm64/kernel/proton-pack.c
index fca9cc6f5581..05f40c4e18fd 100644
--- a/arch/arm64/kernel/proton-pack.c
+++ b/arch/arm64/kernel/proton-pack.c
@@ -966,9 +966,6 @@ static void this_cpu_set_vectors(enum arm64_bp_harden_el1_vectors slot)
 {
 	const char *v = arm64_get_bp_hardening_vector(slot);
 
-	if (slot < 0)
-		return;
-
 	__this_cpu_write(this_cpu_vector, v);
 
 	/*
-- 
2.39.2