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Message-ID: <CAJF2gTRj3DN4YJCM2VXqpyJNY7G-PCG4APcLkMk0CKzg-+SsdA@mail.gmail.com>
Date:   Tue, 1 Feb 2022 11:02:59 +0800
From:   Guo Ren <guoren@...nel.org>
To:     Christoph Hellwig <hch@....de>
Cc:     Arnd Bergmann <arnd@...db.de>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "open list:BROADCOM NVRAM DRIVER" <linux-mips@...r.kernel.org>,
        Parisc List <linux-parisc@...r.kernel.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        linux-s390 <linux-s390@...r.kernel.org>,
        sparclinux <sparclinux@...r.kernel.org>,
        linux-arch <linux-arch@...r.kernel.org>
Subject: Re: [PATCH 4/5] uapi: always define F_GETLK64/F_SETLK64/F_SETLKW64 in fcntl.h

On Mon, Jan 31, 2022 at 2:49 PM Christoph Hellwig <hch@....de> wrote:
>
> The F_GETLK64/F_SETLK64/F_SETLKW64 fcntl opcodes are only implemented
> for the 32-bit syscall APIs, but are also needed for compat handling
> on 64-bit kernels.
>
> Consolidate them in unistd.h instead of definining the internal compat
> definitions in compat.h, which is rather errror prone (e.g. parisc
> gets the values wrong currently).
>
> Note that before this change they were never visible to userspace due
> to the fact that CONFIG_64BIT is only set for kernel builds.
>
> Signed-off-by: Christoph Hellwig <hch@....de>
> ---
>  arch/arm64/include/asm/compat.h        | 4 ----
>  arch/mips/include/asm/compat.h         | 4 ----
>  arch/mips/include/uapi/asm/fcntl.h     | 4 ++--
>  arch/powerpc/include/asm/compat.h      | 4 ----
>  arch/s390/include/asm/compat.h         | 4 ----
>  arch/sparc/include/asm/compat.h        | 4 ----
>  arch/x86/include/asm/compat.h          | 4 ----
>  include/uapi/asm-generic/fcntl.h       | 4 ++--
>  tools/include/uapi/asm-generic/fcntl.h | 2 --
>  9 files changed, 4 insertions(+), 30 deletions(-)
>
> diff --git a/arch/arm64/include/asm/compat.h b/arch/arm64/include/asm/compat.h
> index eaa6ca062d89b..2763287654081 100644
> --- a/arch/arm64/include/asm/compat.h
> +++ b/arch/arm64/include/asm/compat.h
> @@ -73,10 +73,6 @@ struct compat_flock {
>         compat_pid_t    l_pid;
>  };
>
> -#define F_GETLK64      12      /*  using 'struct flock64' */
> -#define F_SETLK64      13
> -#define F_SETLKW64     14
> -
>  struct compat_flock64 {
>         short           l_type;
>         short           l_whence;
> diff --git a/arch/mips/include/asm/compat.h b/arch/mips/include/asm/compat.h
> index bbb3bc5a42fd8..6a350c1f70d7e 100644
> --- a/arch/mips/include/asm/compat.h
> +++ b/arch/mips/include/asm/compat.h
> @@ -65,10 +65,6 @@ struct compat_flock {
>         s32             pad[4];
>  };
>
> -#define F_GETLK64      33
> -#define F_SETLK64      34
> -#define F_SETLKW64     35
Oops we can't remove above, right?

> -
>  struct compat_flock64 {
>         short           l_type;
>         short           l_whence;
> diff --git a/arch/mips/include/uapi/asm/fcntl.h b/arch/mips/include/uapi/asm/fcntl.h
> index 9e44ac810db94..0369a38e3d4f2 100644
> --- a/arch/mips/include/uapi/asm/fcntl.h
> +++ b/arch/mips/include/uapi/asm/fcntl.h
> @@ -44,11 +44,11 @@
>  #define F_SETOWN       24      /*  for sockets. */
>  #define F_GETOWN       23      /*  for sockets. */
>
> -#ifndef __mips64
> +#if __BITS_PER_LONG == 32 || defined(__KERNEL__)
>  #define F_GETLK64      33      /*  using 'struct flock64' */
>  #define F_SETLK64      34
>  #define F_SETLKW64     35
> -#endif
> +#endif /* __BITS_PER_LONG == 32 || defined(__KERNEL__) */
>
>  #if _MIPS_SIM != _MIPS_SIM_ABI64
>  #define __ARCH_FLOCK_EXTRA_SYSID       long l_sysid;
> diff --git a/arch/powerpc/include/asm/compat.h b/arch/powerpc/include/asm/compat.h
> index 7afc96fb6524b..83d8f70779cbc 100644
> --- a/arch/powerpc/include/asm/compat.h
> +++ b/arch/powerpc/include/asm/compat.h
> @@ -52,10 +52,6 @@ struct compat_flock {
>         compat_pid_t    l_pid;
>  };
>
> -#define F_GETLK64      12      /*  using 'struct flock64' */
> -#define F_SETLK64      13
> -#define F_SETLKW64     14
> -
>  struct compat_flock64 {
>         short           l_type;
>         short           l_whence;
> diff --git a/arch/s390/include/asm/compat.h b/arch/s390/include/asm/compat.h
> index cdc7ae72529d8..0f14b3188b1bb 100644
> --- a/arch/s390/include/asm/compat.h
> +++ b/arch/s390/include/asm/compat.h
> @@ -110,10 +110,6 @@ struct compat_flock {
>         compat_pid_t    l_pid;
>  };
>
> -#define F_GETLK64       12
> -#define F_SETLK64       13
> -#define F_SETLKW64      14
> -
>  struct compat_flock64 {
>         short           l_type;
>         short           l_whence;
> diff --git a/arch/sparc/include/asm/compat.h b/arch/sparc/include/asm/compat.h
> index bd949fcf9d63b..108078751bb5a 100644
> --- a/arch/sparc/include/asm/compat.h
> +++ b/arch/sparc/include/asm/compat.h
> @@ -84,10 +84,6 @@ struct compat_flock {
>         short           __unused;
>  };
>
> -#define F_GETLK64      12
> -#define F_SETLK64      13
> -#define F_SETLKW64     14
> -
>  struct compat_flock64 {
>         short           l_type;
>         short           l_whence;
> diff --git a/arch/x86/include/asm/compat.h b/arch/x86/include/asm/compat.h
> index 7516e4199b3c6..8d19a212f4f26 100644
> --- a/arch/x86/include/asm/compat.h
> +++ b/arch/x86/include/asm/compat.h
> @@ -58,10 +58,6 @@ struct compat_flock {
>         compat_pid_t    l_pid;
>  };
>
> -#define F_GETLK64      12      /*  using 'struct flock64' */
> -#define F_SETLK64      13
> -#define F_SETLKW64     14
> -
>  /*
>   * IA32 uses 4 byte alignment for 64 bit quantities,
>   * so we need to pack this structure.
> diff --git a/include/uapi/asm-generic/fcntl.h b/include/uapi/asm-generic/fcntl.h
> index 98f4ff165b776..8c05d3d89ff18 100644
> --- a/include/uapi/asm-generic/fcntl.h
> +++ b/include/uapi/asm-generic/fcntl.h
> @@ -116,13 +116,13 @@
>  #define F_GETSIG       11      /* for sockets. */
>  #endif
>
> -#ifndef CONFIG_64BIT
> +#if __BITS_PER_LONG == 32 || defined(__KERNEL__)
>  #ifndef F_GETLK64
>  #define F_GETLK64      12      /*  using 'struct flock64' */
>  #define F_SETLK64      13
>  #define F_SETLKW64     14
>  #endif
> -#endif
> +#endif /* __BITS_PER_LONG == 32 || defined(__KERNEL__) */
>
>  #ifndef F_SETOWN_EX
>  #define F_SETOWN_EX    15
> diff --git a/tools/include/uapi/asm-generic/fcntl.h b/tools/include/uapi/asm-generic/fcntl.h
> index bf961a71802e0..6e16722026f39 100644
> --- a/tools/include/uapi/asm-generic/fcntl.h
> +++ b/tools/include/uapi/asm-generic/fcntl.h
> @@ -115,13 +115,11 @@
>  #define F_GETSIG       11      /* for sockets. */
>  #endif
>
> -#ifndef CONFIG_64BIT
>  #ifndef F_GETLK64
>  #define F_GETLK64      12      /*  using 'struct flock64' */
>  #define F_SETLK64      13
>  #define F_SETLKW64     14
>  #endif
> -#endif
>
>  #ifndef F_SETOWN_EX
>  #define F_SETOWN_EX    15
> --
> 2.30.2
>


-- 
Best Regards
 Guo Ren

ML: https://lore.kernel.org/linux-csky/

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