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Re: [PATCH] arm64: fix warning about swapper_pg_dir overflow

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On Tue, Feb 14, 2017 at 10:27:01PM +0100, Arnd Bergmann wrote:
> With 4 levels of 16KB pages, we get this warning about the fact that we are
> copying a whole page into an array that is declared as having only two pointers
> for the top level of the page table:
> 
> arch/arm64/mm/mmu.c: In function 'paging_init':
> arch/arm64/mm/mmu.c:528:2: error: 'memcpy' writing 16384 bytes into a region of size 16 overflows the destination [-Werror=stringop-overflow=]
> 
> This is harmless since we actually reserve a whole page in the definition of the
> array that comes from, and just the extern declaration is short. The pgdir
> is initialized to zero either way, so copying the actual entries here seems
> like the best solution.

Thanks, I'll queue this up for 4.11 with the acks.

Will

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[PATCH] arm64: fix warning about swapper_pg_dir overflow Arnd Bergmann <arnd@arndb.de> - 2017-02-14 22:30 +0100
  Re: [PATCH] arm64: fix warning about swapper_pg_dir overflow Ard Biesheuvel <ard.biesheuvel@linaro.org> - 2017-02-14 22:40 +0100
    Re: [PATCH] arm64: fix warning about swapper_pg_dir overflow Arnd Bergmann <arnd@arndb.de> - 2017-02-14 23:10 +0100
  Re: [PATCH] arm64: fix warning about swapper_pg_dir overflow Will Deacon <will.deacon@arm.com> - 2017-02-15 12:40 +0100

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