linux-kernel - Re: [PATCH 2/2] selftests/vDSO: make vDSO test work on s390x

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Date:   Tue, 28 Apr 2020 08:21:03 +0200
From:   Sven Schnelle <svens@...ux.ibm.com>
To:     Shuah Khan <shuah@...nel.org>
Cc:     svens@...ckframe.org, Thomas Gleixner <tglx@...utronix.de>,
        Steve Winslow <swinslow@...il.com>,
        Alexios Zavras <alexios.zavras@...el.com>,
        Allison Randal <allison@...utok.net>,
        linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] selftests/vDSO: make vDSO test work on s390x

On Sat, Apr 04, 2020 at 10:37:04PM +0200, Sven Schnelle wrote:
> s390x used 8 byte (Elf64_Xword) sized hash table entries.
> Add some code to the vdso test to handle that properly.

Ping?

> Signed-off-by: Sven Schnelle <svens@...ux.ibm.com>
> ---
>  tools/testing/selftests/vDSO/parse_vdso.c | 14 ++++++++++----
>  tools/testing/selftests/vDSO/vdso_test.c  | 11 +++++++----
>  2 files changed, 17 insertions(+), 8 deletions(-)
> 
> diff --git a/tools/testing/selftests/vDSO/parse_vdso.c b/tools/testing/selftests/vDSO/parse_vdso.c
> index 8e5a70a24d9a..2e1e88ebee3d 100644
> --- a/tools/testing/selftests/vDSO/parse_vdso.c
> +++ b/tools/testing/selftests/vDSO/parse_vdso.c
> @@ -58,6 +58,12 @@ extern void *vdso_sym(const char *version, const char *name);
>  #define ELF_BITS_XFORM(bits, x) ELF_BITS_XFORM2(bits, x)
>  #define ELF(x) ELF_BITS_XFORM(ELF_BITS, x)
>  
> +#if defined(__s390x__)
> +#define	ELF_HASH_TYPE ELF(Xword)
> +#else
> +#define	ELF_HASH_TYPE ELF(Word)
> +#endif
> +
>  static struct vdso_info
>  {
>  	bool valid;
> @@ -69,8 +75,8 @@ static struct vdso_info
>  	/* Symbol table */
>  	ELF(Sym) *symtab;
>  	const char *symstrings;
> -	ELF(Word) *bucket, *chain;
> -	ELF(Word) nbucket, nchain;
> +	ELF_HASH_TYPE *bucket, *chain;
> +	ELF_HASH_TYPE nbucket, nchain;
>  
>  	/* Version table */
>  	ELF(Versym) *versym;
> @@ -131,7 +137,7 @@ void vdso_init_from_sysinfo_ehdr(uintptr_t base)
>  	/*
>  	 * Fish out the useful bits of the dynamic table.
>  	 */
> -	ELF(Word) *hash = 0;
> +	ELF_HASH_TYPE *hash = 0;
>  	vdso_info.symstrings = 0;
>  	vdso_info.symtab = 0;
>  	vdso_info.versym = 0;
> @@ -149,7 +155,7 @@ void vdso_init_from_sysinfo_ehdr(uintptr_t base)
>  				 + vdso_info.load_offset);
>  			break;
>  		case DT_HASH:
> -			hash = (ELF(Word) *)
> +			hash = (ELF_HASH_TYPE *)
>  				((uintptr_t)dyn[i].d_un.d_ptr
>  				 + vdso_info.load_offset);
>  			break;
> diff --git a/tools/testing/selftests/vDSO/vdso_test.c b/tools/testing/selftests/vDSO/vdso_test.c
> index 719d5a6bd664..2b21261a5eba 100644
> --- a/tools/testing/selftests/vDSO/vdso_test.c
> +++ b/tools/testing/selftests/vDSO/vdso_test.c
> @@ -22,11 +22,14 @@ extern void vdso_init_from_sysinfo_ehdr(uintptr_t base);
>  extern void vdso_init_from_auxv(void *auxv);
>  
>  /*
> - * ARM64's vDSO exports its gettimeofday() implementation with a different
> - * name and version from other architectures, so we need to handle it as
> - * a special case.
> + * Both ARM64's and s390x' vDSO exports its gettimeofday() implementation
> + * with a different name and version from other architectures, so we need
> + * to handle them as a special case.
>   */
> -#if defined(__aarch64__)
> +#if defined(__s390x__)
> +const char *version = "LINUX_2.6.29";
> +const char *name = "__kernel_gettimeofday";
> +#elif defined(__aarch64__)
>  const char *version = "LINUX_2.6.39";
>  const char *name = "__kernel_gettimeofday";
>  #else
> -- 
> 2.17.1
>