linux-kernel - Re: [PATCH 5/5] tools: selftests: riscv: Fix compile warnings in mm tests

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Message-ID: <0b4f729b-fe97-4a42-b00c-d3e908cb3839@ghiti.fr>
Date: Fri, 15 Dec 2023 14:50:47 +0100
From: Alexandre Ghiti <alex@...ti.fr>
To: Christoph Muellner <christoph.muellner@...ll.eu>,
 linux-riscv@...ts.infradead.org, linux-kselftest@...r.kernel.org,
 linux-kernel@...r.kernel.org, Palmer Dabbelt <palmer@...belt.com>,
 Paul Walmsley <paul.walmsley@...ive.com>, Albert Ou <aou@...s.berkeley.edu>,
 Shuah Khan <shuah@...nel.org>
Cc: Philipp Tomsich <philipp.tomsich@...ll.eu>,
 Andrew Jones <ajones@...tanamicro.com>, Evan Green <evan@...osinc.com>,
 Xiao Wang <xiao.w.wang@...el.com>, Alexandre Ghiti <alexghiti@...osinc.com>,
 Andy Chiu <andy.chiu@...ive.com>, Björn Töpel
 <bjorn@...osinc.com>, Charlie Jenkins <charlie@...osinc.com>
Subject: Re: [PATCH 5/5] tools: selftests: riscv: Fix compile warnings in mm
 tests

On 23/11/2023 19:58, Christoph Muellner wrote:
> From: Christoph Müllner <christoph.muellner@...ll.eu>
>
> When building the mm tests with a riscv32 compiler, we see a range
> of shift-count-overflow errors from shifting 1UL by more than 32 bits
> in do_mmaps(). Since, the relevant code is only called from code that
> is gated by `__riscv_xlen == 64`, we can just apply the same gating
> to do_mmaps().
>
> Signed-off-by: Christoph Müllner <christoph.muellner@...ll.eu>
> ---
>   tools/testing/selftests/riscv/mm/mmap_test.h | 3 +++
>   1 file changed, 3 insertions(+)
>
> diff --git a/tools/testing/selftests/riscv/mm/mmap_test.h b/tools/testing/selftests/riscv/mm/mmap_test.h
> index 9b8434f62f57..2e0db9c5be6c 100644
> --- a/tools/testing/selftests/riscv/mm/mmap_test.h
> +++ b/tools/testing/selftests/riscv/mm/mmap_test.h
> @@ -18,6 +18,8 @@ struct addresses {
>   	int *on_56_addr;
>   };
>   
> +// Only works on 64 bit
> +#if __riscv_xlen == 64
>   static inline void do_mmaps(struct addresses *mmap_addresses)
>   {
>   	/*
> @@ -50,6 +52,7 @@ static inline void do_mmaps(struct addresses *mmap_addresses)
>   	mmap_addresses->on_56_addr =
>   		mmap(on_56_bits, 5 * sizeof(int), prot, flags, 0, 0);
>   }
> +#endif /* __riscv_xlen == 64 */
>   
>   static inline int memory_layout(void)
>   {


You can add:

Reviewed-by: Alexandre Ghiti <alexghiti@...osinc.com>

Thanks!

Alex