linux-kernel - [PATCH AUTOSEL 4.19 081/158] x86/cacheinfo: Fix a -Wtype-limits warning

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Message-Id: <20190715141809.8445-81-sashal@kernel.org>
Date:   Mon, 15 Jul 2019 10:16:52 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Qian Cai <cai@....pw>, Borislav Petkov <bp@...e.de>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Pu Wen <puwen@...on.cn>,
        Suravee Suthikulpanit <suravee.suthikulpanit@....com>,
        Thomas Gleixner <tglx@...utronix.de>, x86-ml <x86@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 4.19 081/158] x86/cacheinfo: Fix a -Wtype-limits warning

From: Qian Cai <cai@....pw>

[ Upstream commit 1b7aebf0487613033aff26420e32fa2076d52846 ]

cpuinfo_x86.x86_model is an unsigned type, so comparing against zero
will generate a compilation warning:

  arch/x86/kernel/cpu/cacheinfo.c: In function 'cacheinfo_amd_init_llc_id':
  arch/x86/kernel/cpu/cacheinfo.c:662:19: warning: comparison is always true \
    due to limited range of data type [-Wtype-limits]

Remove the unnecessary lower bound check.

 [ bp: Massage. ]

Fixes: 68091ee7ac3c ("x86/CPU/AMD: Calculate last level cache ID from number of sharing threads")
Signed-off-by: Qian Cai <cai@....pw>
Signed-off-by: Borislav Petkov <bp@...e.de>
Reviewed-by: Sean Christopherson <sean.j.christopherson@...el.com>
Cc: "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Cc: "H. Peter Anvin" <hpa@...or.com>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Masami Hiramatsu <mhiramat@...nel.org>
Cc: Pu Wen <puwen@...on.cn>
Cc: Suravee Suthikulpanit <suravee.suthikulpanit@....com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: x86-ml <x86@...nel.org>
Link: https://lkml.kernel.org/r/1560954773-11967-1-git-send-email-cai@lca.pw
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/x86/kernel/cpu/cacheinfo.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/arch/x86/kernel/cpu/cacheinfo.c b/arch/x86/kernel/cpu/cacheinfo.c
index 0c5fcbd998cf..9d863e8f9b3f 100644
--- a/arch/x86/kernel/cpu/cacheinfo.c
+++ b/arch/x86/kernel/cpu/cacheinfo.c
@@ -651,8 +651,7 @@ void cacheinfo_amd_init_llc_id(struct cpuinfo_x86 *c, int cpu, u8 node_id)
 	if (c->x86 < 0x17) {
 		/* LLC is at the node level. */
 		per_cpu(cpu_llc_id, cpu) = node_id;
-	} else if (c->x86 == 0x17 &&
-		   c->x86_model >= 0 && c->x86_model <= 0x1F) {
+	} else if (c->x86 == 0x17 && c->x86_model <= 0x1F) {
 		/*
 		 * LLC is at the core complex level.
 		 * Core complex ID is ApicId[3] for these processors.
-- 
2.20.1