linux-kernel - Re: [PATCH v2 1/8] selftests/mm: Add -Wunreachable-code and fix warnings

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Message-ID: <c09a2a13-8571-44e5-b780-c704598df764@arm.com>
Date: Mon, 18 Aug 2025 10:10:36 +0200
From: Kevin Brodsky <kevin.brodsky@....com>
To: Muhammad Usama Anjum <usama.anjum@...labora.com>,
 Andrew Morton <akpm@...ux-foundation.org>,
 David Hildenbrand <david@...hat.com>,
 Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
 "Liam R. Howlett" <Liam.Howlett@...cle.com>, Vlastimil Babka
 <vbabka@...e.cz>, Mike Rapoport <rppt@...nel.org>,
 Suren Baghdasaryan <surenb@...gle.com>, Michal Hocko <mhocko@...e.com>,
 Jason Gunthorpe <jgg@...pe.ca>, John Hubbard <jhubbard@...dia.com>,
 Peter Xu <peterx@...hat.com>, Leon Romanovsky <leon@...nel.org>,
 Zi Yan <ziy@...dia.com>, Baolin Wang <baolin.wang@...ux.alibaba.com>,
 Nico Pache <npache@...hat.com>, Ryan Roberts <ryan.roberts@....com>,
 Dev Jain <dev.jain@....com>, Barry Song <baohua@...nel.org>,
 Paul Walmsley <paul.walmsley@...ive.com>, Palmer Dabbelt
 <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>,
 Alexandre Ghiti <alex@...ti.fr>, linux-kselftest@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-mm@...ck.org,
 linux-riscv@...ts.infradead.org, Shuah Khan <shuah@...nel.org>
Cc: kernel@...labora.com
Subject: Re: [PATCH v2 1/8] selftests/mm: Add -Wunreachable-code and fix
 warnings

On 31/07/2025 18:01, Muhammad Usama Anjum wrote:
> [...]
>
> diff --git a/tools/testing/selftests/mm/pkey_sighandler_tests.c b/tools/testing/selftests/mm/pkey_sighandler_tests.c
> index b5e076a564c95..302fef54049c8 100644
> --- a/tools/testing/selftests/mm/pkey_sighandler_tests.c
> +++ b/tools/testing/selftests/mm/pkey_sighandler_tests.c
> @@ -41,7 +41,7 @@ static siginfo_t siginfo = {0};
>   * syscall will attempt to access the PLT in order to call a library function
>   * which is protected by MPK 0 which we don't have access to.
>   */
> -static inline __always_inline
> +static __always_inline

Thanks for this, I had this fix locally but never got to post it!

>  long syscall_raw(long n, long a1, long a2, long a3, long a4, long a5, long a6)
>  {
>  	unsigned long ret;
> diff --git a/tools/testing/selftests/mm/split_huge_page_test.c b/tools/testing/selftests/mm/split_huge_page_test.c
> index 05de1fc0005b7..a85b2e393e4e8 100644
> --- a/tools/testing/selftests/mm/split_huge_page_test.c
> +++ b/tools/testing/selftests/mm/split_huge_page_test.c
> @@ -296,10 +296,8 @@ void split_file_backed_thp(int order)
>  		ksft_exit_fail_msg("Unable to create a tmpfs for testing\n");
>  
>  	status = snprintf(testfile, INPUT_MAX, "%s/thp_file", tmpfs_loc);
> -	if (status >= INPUT_MAX) {
> +	if (status >= INPUT_MAX)
>  		ksft_exit_fail_msg("Fail to create file-backed THP split testing file\n");
> -		goto cleanup;

At that point the mount() call has succeeded so I think we do want to
keep the goto and just print the error message instead of calling
replace ksft_exit_fail_msg().

- Kevin

> -	}
>  
>  	fd = open(testfile, O_CREAT|O_RDWR, 0664);
>  	if (fd == -1) {