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From:   Masahiro Yamada <yamada.masahiro@socionext.com>
Date:   Thu, 7 Jun 2018 13:58:45 +0900
Message-ID: <CAK7LNAR+P68OrNfhkY3p05mqrr3OMb53DQNMR01_WRP79gW_bQ@mail.gmail.com>
Subject: Re: [PATCH] uapi: Make generic uapi headers compile standalone.
To:     Jayant Chowdhary <jchowdhary@google.com>
Cc:     Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        kernel-team@android.com,
        Linux Kbuild mailing list <linux-kbuild@vger.kernel.org>
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Sender: linux-kernel-owner@vger.kernel.org
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Hi.


2018-06-07 8:16 GMT+09:00 Jayant Chowdhary <jchowdhary@google.com>:
> In order for static analysis tools to analyze each of the uapi headers,
> we need to enable them to compile stand-alone. Some uapi headers were
> missing dependencies which would not make them compile stand-alone in
> user-land. This patch adds those dependencies.
>
> Test: make defconfig; make -j64
>
> Test: make ARCH=arm64 defconfig;
>       ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- make -j64  all
>
> Test: ran header-abi-dumper[1] on all the affected headers with
>       appropriate include paths[2] for arm64. eg: for drm_fourcc.h,
>
> $HEADER_ABI_DUMPER -o drm_fourcc.h.sdump \
> include/uapi/drm/drm_fourcc.h -- -target aarch64-linux-android -std=gnu99 \
> -isystem $CLANG_INCLUDE_PATH \
> -I include/uapi/ -I arch/arm64/include/generated/uapi \
> -I arch/arm64/include/uapi -I private-compiler-headers
> -I include/generated/uapi \
> -I include/uapi/../../arch/arm/include/uapi


First of all, is this check sensible?

scripts/headers_install.sh manipulates exported headers.

So, shouldn't you do this check after "make headers_install"?


You are adding around <linux/compiler.h> to various UAPI headers.
Could you tell me why it was added?

The tool rips off <linux/compiler.h> anyway when exporting UAPI headers:
https://github.com/torvalds/linux/blob/v4.17/scripts/headers_install.sh#L37


Also, you are adding <stdint.h> to several headers.
Please do not pull it in to the kernel space.
The kernel space defines fixed-width types in its headers.

For example, you added <stdint.h> to include/uapi/scsi/scsi_netlink.h

In my opinion, the correct fix is to replace uint8_t with __u8 or __uint8_t.


> where
> HEADER_ABI_DUMPER=\
> $ANDROID_BUILD_TOP/prebuilts/clang-tools/linux-x86/bin/header-abi-dumper
>
> CLANG_INCLUDE_PATH=\
> $ANDROID_BUILD_TOP/prebuilts/clang/host/linux-x86/clang-3289846/bin/../lib64/clang/3.8/include
>
> on a lunched aosp tree [3]
>
> [1]
> header-abi-dumper is a clang based static analysis tool, used by android's build
> system which parses a C/C++ source file and emits information about the data
> types included in the source. More information can be found at
> https://android.googlesource.com/platform/development/+/master/vndk/tools/header-checker/README.md
>
> [2]
> Some  headers, eg: compiler_types.h, compiler.h, sys/socket.h are not in the
> set of uapi headers, even though they are included by uapi headers(
> include/uapi/linux/types.h, include/uapi/asm-generic/signal-defs.h etc). The
> 'private-compiler-headers' in the test clause was included with private copies
> of these headers. libc distributions (eg: bionic) often have their
> copies of these headers as well.
>
> [3]
> https://source.android.com/setup/build/downloading
>
> Cc: akpm@linux-foundation.org
> Cc: kernel-team@android.com
> Cc: linux-kbuild@vger.kernel.org
> Signed-off-by: Jayant Chowdhary <jchowdhary@google.com>
> ---
>  include/uapi/asm-generic/ipcbuf.h              | 2 ++
>  include/uapi/asm-generic/msgbuf.h              | 3 +++
>  include/uapi/asm-generic/sembuf.h              | 2 ++
>  include/uapi/asm-generic/shmbuf.h              | 2 ++
>  include/uapi/asm-generic/ucontext.h            | 5 +++++
>  include/uapi/linux/agpgart.h                   | 1 -
>  include/uapi/linux/android/binder.h            | 1 +
>  include/uapi/linux/chio.h                      | 6 ++++++
>  include/uapi/linux/coda_psdev.h                | 1 +
>  include/uapi/linux/dvb/dmx.h                   | 3 ---
>  include/uapi/linux/dvb/video.h                 | 3 ---
>  include/uapi/linux/errqueue.h                  | 1 +
>  include/uapi/linux/kexec.h                     | 1 +
>  include/uapi/linux/kfd_ioctl.h                 | 1 +
>  include/uapi/linux/lightnvm.h                  | 1 -
>  include/uapi/linux/ndctl.h                     | 1 +
>  include/uapi/linux/netfilter_bridge/ebtables.h | 1 +
>  include/uapi/linux/nfs4_mount.h                | 3 +++
>  include/uapi/linux/psp-sev.h                   | 1 +
>  include/uapi/linux/scc.h                       | 2 +-
>  include/uapi/linux/sctp.h                      | 3 +++
>  include/uapi/linux/sdla.h                      | 2 ++
>  include/uapi/linux/socket.h                    | 4 ++++
>  include/uapi/linux/stddef.h                    | 5 +++++
>  include/uapi/linux/sysctl.h                    | 1 +
>  include/uapi/linux/types.h                     | 1 +
>  include/uapi/linux/vbox_vmmdev_types.h         | 1 +
>  include/uapi/linux/vboxguest.h                 | 1 +
>  include/uapi/rdma/hfi/hfi1_user.h              | 1 +
>  include/uapi/scsi/scsi_bsg_fc.h                | 2 ++
>  include/uapi/scsi/scsi_netlink.h               | 1 +
>  include/uapi/sound/asound.h                    | 2 +-
>  32 files changed, 55 insertions(+), 10 deletions(-)
>
> diff --git a/include/uapi/asm-generic/ipcbuf.h b/include/uapi/asm-generic/ipcbuf.h
> index 7d80dbd336fb..41a01b494fc7 100644
> --- a/include/uapi/asm-generic/ipcbuf.h
> +++ b/include/uapi/asm-generic/ipcbuf.h
> @@ -2,6 +2,8 @@
>  #ifndef __ASM_GENERIC_IPCBUF_H
>  #define __ASM_GENERIC_IPCBUF_H
>
> +#include <linux/posix_types.h>
> +
>  /*
>   * The generic ipc64_perm structure:
>   * Note extra padding because this structure is passed back and forth
> diff --git a/include/uapi/asm-generic/msgbuf.h b/include/uapi/asm-generic/msgbuf.h
> index fb306ebdb36f..8cdd7ca75df6 100644
> --- a/include/uapi/asm-generic/msgbuf.h
> +++ b/include/uapi/asm-generic/msgbuf.h
> @@ -3,6 +3,9 @@
>  #define __ASM_GENERIC_MSGBUF_H
>
>  #include <asm/bitsperlong.h>
> +#include <asm-generic/ipcbuf.h>
> +#include <linux/posix_types.h>
> +
>  /*
>   * generic msqid64_ds structure.
>   *
> diff --git a/include/uapi/asm-generic/sembuf.h b/include/uapi/asm-generic/sembuf.h
> index cbf9cfe977d6..7f37edb95d9f 100644
> --- a/include/uapi/asm-generic/sembuf.h
> +++ b/include/uapi/asm-generic/sembuf.h
> @@ -3,6 +3,8 @@
>  #define __ASM_GENERIC_SEMBUF_H
>
>  #include <asm/bitsperlong.h>
> +#include <asm-generic/ipcbuf.h>
> +#include <linux/posix_types.h>
>
>  /*
>   * The semid64_ds structure for x86 architecture.
> diff --git a/include/uapi/asm-generic/shmbuf.h b/include/uapi/asm-generic/shmbuf.h
> index 2b6c3bb97f97..1c5e7165fca5 100644
> --- a/include/uapi/asm-generic/shmbuf.h
> +++ b/include/uapi/asm-generic/shmbuf.h
> @@ -3,6 +3,8 @@
>  #define __ASM_GENERIC_SHMBUF_H
>
>  #include <asm/bitsperlong.h>
> +#include <asm-generic/ipcbuf.h>
> +#include <stddef.h>
>
>  /*
>   * The shmid64_ds structure for x86 architecture.
> diff --git a/include/uapi/asm-generic/ucontext.h b/include/uapi/asm-generic/ucontext.h
> index 351868a72168..19199f45c523 100644
> --- a/include/uapi/asm-generic/ucontext.h
> +++ b/include/uapi/asm-generic/ucontext.h
> @@ -2,6 +2,11 @@
>  #ifndef __ASM_GENERIC_UCONTEXT_H
>  #define __ASM_GENERIC_UCONTEXT_H
>
> +#ifndef __KERNEL__
> +#include <asm-generic/signal.h>
> +#include <asm/sigcontext.h>
> +#endif
> +
>  struct ucontext {
>         unsigned long     uc_flags;
>         struct ucontext  *uc_link;
> diff --git a/include/uapi/linux/agpgart.h b/include/uapi/linux/agpgart.h
> index f5251045181a..4e828cf487bc 100644
> --- a/include/uapi/linux/agpgart.h
> +++ b/include/uapi/linux/agpgart.h
> @@ -52,7 +52,6 @@
>
>  #ifndef __KERNEL__
>  #include <linux/types.h>
> -#include <stdlib.h>
>
>  struct agp_version {
>         __u16 major;
> diff --git a/include/uapi/linux/android/binder.h b/include/uapi/linux/android/binder.h
> index bfaec6903b8b..fd6de2203057 100644
> --- a/include/uapi/linux/android/binder.h
> +++ b/include/uapi/linux/android/binder.h
> @@ -23,6 +23,7 @@
>
>  #include <linux/types.h>
>  #include <linux/ioctl.h>
> +#include <sys/types.h>
>
>  #define B_PACK_CHARS(c1, c2, c3, c4) \
>         ((((c1)<<24)) | (((c2)<<16)) | (((c3)<<8)) | (c4))
> diff --git a/include/uapi/linux/chio.h b/include/uapi/linux/chio.h
> index 689fc93fafda..5e63753a0d53 100644
> --- a/include/uapi/linux/chio.h
> +++ b/include/uapi/linux/chio.h
> @@ -3,6 +3,11 @@
>   * ioctl interface for the scsi media changer driver
>   */
>
> +#ifndef _UAPI_CHIO_H
> +#define _UAPI_CHIO_H
> +
> +#include <linux/compiler.h>
> +
>  /* changer element types */
>  #define CHET_MT   0    /* media transport element (robot) */
>  #define CHET_ST   1    /* storage element (media slots) */
> @@ -167,3 +172,4 @@ struct changer_set_voltag {
>   * c-basic-offset: 8
>   * End:
>   */
> +#endif
> diff --git a/include/uapi/linux/coda_psdev.h b/include/uapi/linux/coda_psdev.h
> index aa6623efd2dd..31b1867021b7 100644
> --- a/include/uapi/linux/coda_psdev.h
> +++ b/include/uapi/linux/coda_psdev.h
> @@ -3,6 +3,7 @@
>  #define _UAPI__CODA_PSDEV_H
>
>  #include <linux/magic.h>
> +#include <sys/types.h>
>
>  #define CODA_PSDEV_MAJOR 67
>  #define MAX_CODADEVS  5           /* how many do we allow */
> diff --git a/include/uapi/linux/dvb/dmx.h b/include/uapi/linux/dvb/dmx.h
> index b4112f0b6dd3..ce30e9f6145a 100644
> --- a/include/uapi/linux/dvb/dmx.h
> +++ b/include/uapi/linux/dvb/dmx.h
> @@ -26,9 +26,6 @@
>  #define _UAPI_DVBDMX_H_
>
>  #include <linux/types.h>
> -#ifndef __KERNEL__
> -#include <time.h>
> -#endif
>
>
>  #define DMX_FILTER_SIZE 16
> diff --git a/include/uapi/linux/dvb/video.h b/include/uapi/linux/dvb/video.h
> index df3d7028c807..8f3a485b9988 100644
> --- a/include/uapi/linux/dvb/video.h
> +++ b/include/uapi/linux/dvb/video.h
> @@ -26,9 +26,6 @@
>  #define _UAPI_DVBVIDEO_H_
>
>  #include <linux/types.h>
> -#ifndef __KERNEL__
> -#include <time.h>
> -#endif
>
>  typedef enum {
>         VIDEO_FORMAT_4_3,     /* Select 4:3 format */
> diff --git a/include/uapi/linux/errqueue.h b/include/uapi/linux/errqueue.h
> index dc64cfaf13da..ad2421e3d613 100644
> --- a/include/uapi/linux/errqueue.h
> +++ b/include/uapi/linux/errqueue.h
> @@ -2,6 +2,7 @@
>  #ifndef _UAPI_LINUX_ERRQUEUE_H
>  #define _UAPI_LINUX_ERRQUEUE_H
>
> +#include <linux/time.h>
>  #include <linux/types.h>
>
>  struct sock_extended_err {
> diff --git a/include/uapi/linux/kexec.h b/include/uapi/linux/kexec.h
> index 6d112868272d..49d50d469723 100644
> --- a/include/uapi/linux/kexec.h
> +++ b/include/uapi/linux/kexec.h
> @@ -8,6 +8,7 @@
>   */
>
>  #include <linux/types.h>
> +#include <stddef.h>
>
>  /* kexec flags for different usage scenarios */
>  #define KEXEC_ON_CRASH         0x00000001
> diff --git a/include/uapi/linux/kfd_ioctl.h b/include/uapi/linux/kfd_ioctl.h
> index b4f5073dbac2..4a882a133b69 100644
> --- a/include/uapi/linux/kfd_ioctl.h
> +++ b/include/uapi/linux/kfd_ioctl.h
> @@ -25,6 +25,7 @@
>
>  #include <drm/drm.h>
>  #include <linux/ioctl.h>
> +#include <stdint.h>
>
>  #define KFD_IOCTL_MAJOR_VERSION 1
>  #define KFD_IOCTL_MINOR_VERSION 1
> diff --git a/include/uapi/linux/lightnvm.h b/include/uapi/linux/lightnvm.h
> index f9a1be7fc696..af28d32b0ac3 100644
> --- a/include/uapi/linux/lightnvm.h
> +++ b/include/uapi/linux/lightnvm.h
> @@ -24,7 +24,6 @@
>  #include <linux/kernel.h>
>  #include <linux/ioctl.h>
>  #else /* __KERNEL__ */
> -#include <stdio.h>
>  #include <sys/ioctl.h>
>  #define DISK_NAME_LEN 32
>  #endif /* __KERNEL__ */
> diff --git a/include/uapi/linux/ndctl.h b/include/uapi/linux/ndctl.h
> index 7e27070b9440..a89a294e5ca5 100644
> --- a/include/uapi/linux/ndctl.h
> +++ b/include/uapi/linux/ndctl.h
> @@ -13,6 +13,7 @@
>  #ifndef __NDCTL_H__
>  #define __NDCTL_H__
>
> +#include <linux/compiler.h>
>  #include <linux/types.h>
>
>  struct nd_cmd_dimm_flags {
> diff --git a/include/uapi/linux/netfilter_bridge/ebtables.h b/include/uapi/linux/netfilter_bridge/ebtables.h
> index 0c7dc8315013..c57850b90b50 100644
> --- a/include/uapi/linux/netfilter_bridge/ebtables.h
> +++ b/include/uapi/linux/netfilter_bridge/ebtables.h
> @@ -16,6 +16,7 @@
>  #include <linux/types.h>
>  #include <linux/if.h>
>  #include <linux/netfilter_bridge.h>
> +#include <stdint.h>
>
>  #define EBT_TABLE_MAXNAMELEN 32
>  #define EBT_CHAIN_MAXNAMELEN EBT_TABLE_MAXNAMELEN
> diff --git a/include/uapi/linux/nfs4_mount.h b/include/uapi/linux/nfs4_mount.h
> index d20bb869bb99..6c9792073b19 100644
> --- a/include/uapi/linux/nfs4_mount.h
> +++ b/include/uapi/linux/nfs4_mount.h
> @@ -19,6 +19,9 @@
>   */
>  #define NFS4_MOUNT_VERSION     1
>
> +#include <linux/socket.h> /* for struct sockaddr. */
> +#include <linux/compiler.h>
> +
>  struct nfs_string {
>         unsigned int len;
>         const char __user * data;
> diff --git a/include/uapi/linux/psp-sev.h b/include/uapi/linux/psp-sev.h
> index 9008f31c7eb6..c796f1b194a3 100644
> --- a/include/uapi/linux/psp-sev.h
> +++ b/include/uapi/linux/psp-sev.h
> @@ -18,6 +18,7 @@
>  #define __PSP_SEV_USER_H__
>
>  #include <linux/types.h>
> +#include <linux/compiler.h>
>
>  /**
>   * SEV platform commands
> diff --git a/include/uapi/linux/scc.h b/include/uapi/linux/scc.h
> index c5bc7f747755..9122d48a4227 100644
> --- a/include/uapi/linux/scc.h
> +++ b/include/uapi/linux/scc.h
> @@ -4,7 +4,7 @@
>  #ifndef _UAPI_SCC_H
>  #define _UAPI_SCC_H
>
> -
> +#include <linux/sockios.h>
>  /* selection of hardware types */
>
>  #define PA0HZP         0x00    /* hardware type for PA0HZP SCC card and compatible */
> diff --git a/include/uapi/linux/sctp.h b/include/uapi/linux/sctp.h
> index b64d583bf053..de4675d92e9f 100644
> --- a/include/uapi/linux/sctp.h
> +++ b/include/uapi/linux/sctp.h
> @@ -56,6 +56,9 @@
>
>  #include <linux/types.h>
>  #include <linux/socket.h>
> +#ifndef __KERNEL__
> +#include <stdint.h>
> +#endif
>
>  typedef __s32 sctp_assoc_t;
>
> diff --git a/include/uapi/linux/sdla.h b/include/uapi/linux/sdla.h
> index 1e3735be6511..2a0dc687aa49 100644
> --- a/include/uapi/linux/sdla.h
> +++ b/include/uapi/linux/sdla.h
> @@ -24,6 +24,8 @@
>  #ifndef _UAPISDLA_H
>  #define _UAPISDLA_H
>
> +#include <linux/compiler.h>
> +
>  /* adapter type */
>  #define SDLA_TYPES
>  #define SDLA_S502A                     5020
> diff --git a/include/uapi/linux/socket.h b/include/uapi/linux/socket.h
> index 8eb96021709c..51c11f6b26e6 100644
> --- a/include/uapi/linux/socket.h
> +++ b/include/uapi/linux/socket.h
> @@ -11,6 +11,10 @@
>
>  typedef unsigned short __kernel_sa_family_t;
>
> +#ifndef __KERNEL__
> +#include <sys/socket.h>                        /* for struct sockaddr.         */
> +#endif
> +
>  struct __kernel_sockaddr_storage {
>         __kernel_sa_family_t    ss_family;              /* address family */
>         /* Following field(s) are implementation specific */
> diff --git a/include/uapi/linux/stddef.h b/include/uapi/linux/stddef.h
> index ee8220f8dcf5..c949a6836417 100644
> --- a/include/uapi/linux/stddef.h
> +++ b/include/uapi/linux/stddef.h
> @@ -1,6 +1,11 @@
>  /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
> +#ifndef __UAPI_STDDEF_H__
> +#define __UAPI_STDDEF_H__
> +
>  #include <linux/compiler_types.h>
>
>  #ifndef __always_inline
>  #define __always_inline inline
>  #endif
> +
> +#endif // __UAPI_STDDEF_H__
> diff --git a/include/uapi/linux/sysctl.h b/include/uapi/linux/sysctl.h
> index 6b58371b1f0d..fac6c1c7def2 100644
> --- a/include/uapi/linux/sysctl.h
> +++ b/include/uapi/linux/sysctl.h
> @@ -26,6 +26,7 @@
>  #include <linux/kernel.h>
>  #include <linux/types.h>
>  #include <linux/compiler.h>
> +#include <stddef.h>
>
>  #define CTL_MAXNAME 10         /* how many path components do we allow in a
>                                    call to sysctl?   In other words, what is
> diff --git a/include/uapi/linux/types.h b/include/uapi/linux/types.h
> index cd4f0b897a48..d61eb82432be 100644
> --- a/include/uapi/linux/types.h
> +++ b/include/uapi/linux/types.h
> @@ -11,6 +11,7 @@
>  #endif /* __EXPORTED_HEADERS__ */
>  #endif
>
> +#include <linux/compiler_types.h>
>  #include <linux/posix_types.h>
>
>
> diff --git a/include/uapi/linux/vbox_vmmdev_types.h b/include/uapi/linux/vbox_vmmdev_types.h
> index 0e68024f36c7..26d0e69f6fdc 100644
> --- a/include/uapi/linux/vbox_vmmdev_types.h
> +++ b/include/uapi/linux/vbox_vmmdev_types.h
> @@ -11,6 +11,7 @@
>
>  #include <asm/bitsperlong.h>
>  #include <linux/types.h>
> +#include <linux/compiler.h>
>
>  /*
>   * We cannot use linux' compiletime_assert here because it expects to be used
> diff --git a/include/uapi/linux/vboxguest.h b/include/uapi/linux/vboxguest.h
> index 612f0c7d3558..44606c96f830 100644
> --- a/include/uapi/linux/vboxguest.h
> +++ b/include/uapi/linux/vboxguest.h
> @@ -9,6 +9,7 @@
>  #define __UAPI_VBOXGUEST_H__
>
>  #include <asm/bitsperlong.h>
> +#include <linux/compiler.h>
>  #include <linux/ioctl.h>
>  #include <linux/vbox_err.h>
>  #include <linux/vbox_vmmdev_types.h>
> diff --git a/include/uapi/rdma/hfi/hfi1_user.h b/include/uapi/rdma/hfi/hfi1_user.h
> index c6a984c0c881..6f5e461b8015 100644
> --- a/include/uapi/rdma/hfi/hfi1_user.h
> +++ b/include/uapi/rdma/hfi/hfi1_user.h
> @@ -58,6 +58,7 @@
>  #define _LINUX__HFI1_USER_H
>
>  #include <linux/types.h>
> +#include <linux/compiler.h>
>  #include <rdma/rdma_user_ioctl.h>
>
>  /*
> diff --git a/include/uapi/scsi/scsi_bsg_fc.h b/include/uapi/scsi/scsi_bsg_fc.h
> index 62597d86beed..23971d00c46d 100644
> --- a/include/uapi/scsi/scsi_bsg_fc.h
> +++ b/include/uapi/scsi/scsi_bsg_fc.h
> @@ -23,6 +23,8 @@
>  #ifndef SCSI_BSG_FC_H
>  #define SCSI_BSG_FC_H
>
> +#include <stdint.h>
> +
>  /*
>   * This file intended to be included by both kernel and user space
>   */
> diff --git a/include/uapi/scsi/scsi_netlink.h b/include/uapi/scsi/scsi_netlink.h
> index 5ccc2333acab..37d39eb671cc 100644
> --- a/include/uapi/scsi/scsi_netlink.h
> +++ b/include/uapi/scsi/scsi_netlink.h
> @@ -25,6 +25,7 @@
>
>  #include <linux/netlink.h>
>  #include <linux/types.h>
> +#include <stdint.h>
>
>  /*
>   * This file intended to be included by both kernel and user space
> diff --git a/include/uapi/sound/asound.h b/include/uapi/sound/asound.h
> index ed0a120d4f08..b569f0eb3a7f 100644
> --- a/include/uapi/sound/asound.h
> +++ b/include/uapi/sound/asound.h
> @@ -31,7 +31,7 @@
>  #endif
>
>  #ifndef __KERNEL__
> -#include <stdlib.h>
> +#include<linux/time.h>
>  #endif
>
>  /*
> --
> 2.17.1.1185.g55be947832-goog
>
> --
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-- 
Best Regards
Masahiro Yamada