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Date: Thu, 2 Nov 2017 12:25:47 +0000 From: Vladimir Murzin <vladimir.murzin@....com> To: Arnd Bergmann <arnd@...db.de>, Russell King <linux@...linux.org.uk> Cc: Nicolas Pitre <nicolas.pitre@...aro.org>, afzal mohammed <afzal.mohd.ma@...il.com>, Laura Abbott <labbott@...hat.com>, linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH] ARM: NOMMU: work around maybe-uninitialized warning On 02/11/17 09:21, Arnd Bergmann wrote: > The reworked MPU code produces a new warning in some configurations, > presumably starting with the code move after the compiler now makes > different inlining decisions: > > arch/arm/mm/pmsa-v7.c: In function 'adjust_lowmem_bounds_mpu': > arch/arm/mm/pmsa-v7.c:310:5: error: 'specified_mem_size' may be used uninitialized in this function [-Werror=maybe-uninitialized] > > This appears to be harmless, as we know that there is always at > least one memblock, and the only way this could get triggered is > if the for_each_memblock() loop was never entered. > > I could not come up with a better workaround than initializing > the specified_mem_size to zero, but at least that is the value > that the variable would have in the hypothetical case of no > memblocks. > > Fixes: 877ec119dbbf ("ARM: 8706/1: NOMMU: Move out MPU setup in separate module") > Signed-off-by: Arnd Bergmann <arnd@...db.de> > --- > Vladimir, if this looks good to you, can you forward it to Russell's > patch tracker, or otherwise suggest a different fix? Accepted as patch 8719/1. Not sure if Russell will pick it up or not... anyway, thanks for the patch! Vladimir > --- > arch/arm/mm/pmsa-v7.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/arch/arm/mm/pmsa-v7.c b/arch/arm/mm/pmsa-v7.c > index 106ae1c435a3..976df60ac426 100644 > --- a/arch/arm/mm/pmsa-v7.c > +++ b/arch/arm/mm/pmsa-v7.c > @@ -234,7 +234,7 @@ static int __init allocate_region(phys_addr_t base, phys_addr_t size, > /* MPU initialisation functions */ > void __init adjust_lowmem_bounds_mpu(void) > { > - phys_addr_t specified_mem_size, total_mem_size = 0; > + phys_addr_t specified_mem_size = 0, total_mem_size = 0; > struct memblock_region *reg; > bool first = true; > phys_addr_t mem_start; >
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