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From: Arnd Bergmann <arnd@kernel.org>
To: Linus Walleij <linus.walleij@linaro.org>,
	Viresh Kumar <viresh.kumar@linaro.org>,
	Sudeep Holla <sudeep.holla@arm.com>
Cc: Arnd Bergmann <arnd@arndb.de>,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH] ARM: vexpress: spc: fix uniprocessor initialization
Date: Tue, 23 Mar 2021 13:56:38 +0100	[thread overview]
Message-ID: <20210323125649.1930186-1-arnd@kernel.org> (raw)

From: Arnd Bergmann <arnd@arndb.de>

When CONFIG_SMP is disabled, topology_physical_package_id()
returns -1 and gcc notices undefined behavior:

arch/arm/mach-versatile/spc.c: In function 've_spc_clk_init':
arch/arm/mach-versatile/spc.c:583:21: error: array subscript -1 is below array bounds of 'bool[2]' {aka '_Bool[2]'} [-Werror=array-bounds]
  583 |   if (init_opp_table[cluster])
      |       ~~~~~~~~~~~~~~^~~~~~~~~
arch/arm/mach-versatile/spc.c:556:7: note: while referencing 'init_opp_table'
  556 |  bool init_opp_table[MAX_CLUSTERS] = { false };
      |       ^~~~~~~~~~~~~~

It's not clear to me what the correct behavior should be, but
it seems safe to just not continue with the initialization.

Fixes: 2a76352ad2cc ("ARM: vexpress: Set-up shared OPP table instead of individual for each CPU")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 arch/arm/mach-versatile/spc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/mach-versatile/spc.c b/arch/arm/mach-versatile/spc.c
index 1da11bdb1dfb..1c6500c4e6a1 100644
--- a/arch/arm/mach-versatile/spc.c
+++ b/arch/arm/mach-versatile/spc.c
@@ -580,7 +580,7 @@ static int __init ve_spc_clk_init(void)
 		}
 
 		cluster = topology_physical_package_id(cpu_dev->id);
-		if (init_opp_table[cluster])
+		if (cluster < 0 || init_opp_table[cluster])
 			continue;
 
 		if (ve_init_opp_table(cpu_dev))
-- 
2.29.2


             reply	other threads:[~2021-03-23 12:57 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-23 12:56 Arnd Bergmann [this message]
2021-03-26 13:41 ` [PATCH] ARM: vexpress: spc: fix uniprocessor initialization Sudeep Holla

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