From: "Philippe Mathieu-Daudé" <philmd@redhat.com> To: qemu-devel@nongnu.org Cc: "Fam Zheng" <fam@euphon.net>, "Peter Maydell" <peter.maydell@linaro.org>, "Marc-André Lureau" <marcandre.lureau@redhat.com>, "David Hildenbrand" <david@redhat.com>, "Jason Wang" <jasowang@redhat.com>, "Yuval Shaia" <yuval.shaia.ml@gmail.com>, "Gerd Hoffmann" <kraxel@redhat.com>, "Stefano Stabellini" <sstabellini@kernel.org>, qemu-block@nongnu.org, "Paul Durrant" <paul@xen.org>, "Halil Pasic" <pasic@linux.ibm.com>, "Christian Borntraeger" <borntraeger@de.ibm.com>, "Gonglei (Arei)" <arei.gonglei@huawei.com>, "Anthony Perard" <anthony.perard@citrix.com>, xen-devel@lists.xenproject.org, "Philippe Mathieu-Daudé" <philmd@redhat.com>, "Thomas Huth" <thuth@redhat.com>, "Eduardo Habkost" <ehabkost@redhat.com>, "Eric Auger" <eric.auger@redhat.com>, qemu-s390x@nongnu.org, qemu-arm@nongnu.org, "Igor Mammedov" <imammedo@redhat.com>, "John Snow" <jsnow@redhat.com>, "Richard Henderson" <rth@twiddle.net>, "Kevin Wolf" <kwolf@redhat.com>, "Xiao Guangrong" <xiaoguangrong.eric@gmail.com>, "Cornelia Huck" <cohuck@redhat.com>, "Laurent Vivier" <laurent@vivier.eu>, "Max Reitz" <mreitz@redhat.com>, "Michael S. Tsirkin" <mst@redhat.com>, "Paolo Bonzini" <pbonzini@redhat.com> Subject: [PATCH 0/2] misc: Replace zero-length arrays with flexible array member Date: Wed, 4 Mar 2020 16:35:59 +0100 [thread overview] Message-ID: <20200304153601.23423-1-philmd@redhat.com> (raw) v2: - do not modify qed.h (structure with single member) - based on hw/scsi/spapr_vscsi fix series This is a tree-wide cleanup inspired by a Linux kernel commit (from Gustavo A. R. Silva). --v-- description start --v-- The current codebase makes use of the zero-length array language extension to the C90 standard, but the preferred mechanism to declare variable-length types such as these ones is a flexible array member [1], introduced in C99: struct foo { int stuff; struct boo array[]; }; By making use of the mechanism above, we will get a compiler warning in case the flexible array does not occur last in the structure, which will help us prevent some kind of undefined behavior bugs from being unadvertenly introduced [2] to the Linux codebase from now on. --^-- description end --^-- Do the similar housekeeping in the QEMU codebase (which uses C99 since commit 7be41675f7cb). The first patch is done with the help of a coccinelle semantic patch. However Coccinelle does not recognize: struct foo { int stuff; struct boo array[]; } QEMU_PACKED; but does recognize: struct QEMU_PACKED foo { int stuff; struct boo array[]; }; I'm not sure why, neither it is worth refactoring all QEMU structures to use the attributes before the structure name, so I did the 2nd patch manually. Anyway this is annoying, because many structures are not handled by coccinelle. Maybe this needs to be reported to upstream coccinelle? I used spatch 1.0.8 with: -I include --include-headers \ --macro-file scripts/cocci-macro-file.h \ --keep-comments --indent 4 Regards, Phil. Based-on: <20200304153311.22959-1-philmd@redhat.com> Supersedes: <20200304005105.27454-1-philmd@redhat.com> Philippe Mathieu-Daudé (2): misc: Replace zero-length arrays with flexible array member (automatic) misc: Replace zero-length arrays with flexible array member (manual) docs/interop/vhost-user.rst | 4 ++-- bsd-user/qemu.h | 2 +- contrib/libvhost-user/libvhost-user.h | 2 +- hw/m68k/bootinfo.h | 2 +- hw/scsi/srp.h | 6 +++--- hw/xen/xen_pt.h | 2 +- include/hw/acpi/acpi-defs.h | 16 ++++++++-------- include/hw/arm/smmu-common.h | 2 +- include/hw/boards.h | 2 +- include/hw/i386/intel_iommu.h | 3 ++- include/hw/s390x/event-facility.h | 2 +- include/hw/s390x/sclp.h | 8 ++++---- include/hw/virtio/virtio-iommu.h | 2 +- include/sysemu/cryptodev.h | 2 +- include/tcg/tcg.h | 2 +- pc-bios/s390-ccw/bootmap.h | 2 +- pc-bios/s390-ccw/sclp.h | 2 +- tests/qtest/libqos/ahci.h | 2 +- block/linux-aio.c | 2 +- block/vmdk.c | 2 +- hw/acpi/nvdimm.c | 6 +++--- hw/char/sclpconsole-lm.c | 2 +- hw/char/sclpconsole.c | 2 +- hw/dma/soc_dma.c | 2 +- hw/i386/x86.c | 2 +- hw/misc/omap_l4.c | 2 +- hw/nvram/eeprom93xx.c | 2 +- hw/rdma/vmw/pvrdma_qp_ops.c | 4 ++-- hw/s390x/virtio-ccw.c | 2 +- hw/usb/dev-network.c | 2 +- hw/usb/dev-smartcard-reader.c | 4 ++-- hw/virtio/virtio.c | 4 ++-- net/queue.c | 2 +- target/s390x/ioinst.c | 2 +- 34 files changed, 53 insertions(+), 52 deletions(-) -- 2.21.1
WARNING: multiple messages have this Message-ID (diff)
From: "Philippe Mathieu-Daudé" <philmd@redhat.com> To: qemu-devel@nongnu.org Cc: "Fam Zheng" <fam@euphon.net>, "Peter Maydell" <peter.maydell@linaro.org>, "Marc-André Lureau" <marcandre.lureau@redhat.com>, "David Hildenbrand" <david@redhat.com>, "Jason Wang" <jasowang@redhat.com>, "Yuval Shaia" <yuval.shaia.ml@gmail.com>, "Gerd Hoffmann" <kraxel@redhat.com>, "Stefano Stabellini" <sstabellini@kernel.org>, qemu-block@nongnu.org, "Paul Durrant" <paul@xen.org>, "Halil Pasic" <pasic@linux.ibm.com>, "Christian Borntraeger" <borntraeger@de.ibm.com>, "Gonglei (Arei)" <arei.gonglei@huawei.com>, "Marcel Apfelbaum" <marcel.apfelbaum@gmail.com>, "Anthony Perard" <anthony.perard@citrix.com>, xen-devel@lists.xenproject.org, "Philippe Mathieu-Daudé" <philmd@redhat.com>, "Thomas Huth" <thuth@redhat.com>, "Eduardo Habkost" <ehabkost@redhat.com>, "Eric Auger" <eric.auger@redhat.com>, qemu-s390x@nongnu.org, qemu-arm@nongnu.org, "Igor Mammedov" <imammedo@redhat.com>, "John Snow" <jsnow@redhat.com>, "Richard Henderson" <rth@twiddle.net>, "Kevin Wolf" <kwolf@redhat.com>, "Xiao Guangrong" <xiaoguangrong.eric@gmail.com>, "Cornelia Huck" <cohuck@redhat.com>, "Laurent Vivier" <laurent@vivier.eu>, "Max Reitz" <mreitz@redhat.com>, "Michael S. Tsirkin" <mst@redhat.com>, "Paolo Bonzini" <pbonzini@redhat.com> Subject: [Xen-devel] [PATCH 0/2] misc: Replace zero-length arrays with flexible array member Date: Wed, 4 Mar 2020 16:35:59 +0100 [thread overview] Message-ID: <20200304153601.23423-1-philmd@redhat.com> (raw) v2: - do not modify qed.h (structure with single member) - based on hw/scsi/spapr_vscsi fix series This is a tree-wide cleanup inspired by a Linux kernel commit (from Gustavo A. R. Silva). --v-- description start --v-- The current codebase makes use of the zero-length array language extension to the C90 standard, but the preferred mechanism to declare variable-length types such as these ones is a flexible array member [1], introduced in C99: struct foo { int stuff; struct boo array[]; }; By making use of the mechanism above, we will get a compiler warning in case the flexible array does not occur last in the structure, which will help us prevent some kind of undefined behavior bugs from being unadvertenly introduced [2] to the Linux codebase from now on. --^-- description end --^-- Do the similar housekeeping in the QEMU codebase (which uses C99 since commit 7be41675f7cb). The first patch is done with the help of a coccinelle semantic patch. However Coccinelle does not recognize: struct foo { int stuff; struct boo array[]; } QEMU_PACKED; but does recognize: struct QEMU_PACKED foo { int stuff; struct boo array[]; }; I'm not sure why, neither it is worth refactoring all QEMU structures to use the attributes before the structure name, so I did the 2nd patch manually. Anyway this is annoying, because many structures are not handled by coccinelle. Maybe this needs to be reported to upstream coccinelle? I used spatch 1.0.8 with: -I include --include-headers \ --macro-file scripts/cocci-macro-file.h \ --keep-comments --indent 4 Regards, Phil. Based-on: <20200304153311.22959-1-philmd@redhat.com> Supersedes: <20200304005105.27454-1-philmd@redhat.com> Philippe Mathieu-Daudé (2): misc: Replace zero-length arrays with flexible array member (automatic) misc: Replace zero-length arrays with flexible array member (manual) docs/interop/vhost-user.rst | 4 ++-- bsd-user/qemu.h | 2 +- contrib/libvhost-user/libvhost-user.h | 2 +- hw/m68k/bootinfo.h | 2 +- hw/scsi/srp.h | 6 +++--- hw/xen/xen_pt.h | 2 +- include/hw/acpi/acpi-defs.h | 16 ++++++++-------- include/hw/arm/smmu-common.h | 2 +- include/hw/boards.h | 2 +- include/hw/i386/intel_iommu.h | 3 ++- include/hw/s390x/event-facility.h | 2 +- include/hw/s390x/sclp.h | 8 ++++---- include/hw/virtio/virtio-iommu.h | 2 +- include/sysemu/cryptodev.h | 2 +- include/tcg/tcg.h | 2 +- pc-bios/s390-ccw/bootmap.h | 2 +- pc-bios/s390-ccw/sclp.h | 2 +- tests/qtest/libqos/ahci.h | 2 +- block/linux-aio.c | 2 +- block/vmdk.c | 2 +- hw/acpi/nvdimm.c | 6 +++--- hw/char/sclpconsole-lm.c | 2 +- hw/char/sclpconsole.c | 2 +- hw/dma/soc_dma.c | 2 +- hw/i386/x86.c | 2 +- hw/misc/omap_l4.c | 2 +- hw/nvram/eeprom93xx.c | 2 +- hw/rdma/vmw/pvrdma_qp_ops.c | 4 ++-- hw/s390x/virtio-ccw.c | 2 +- hw/usb/dev-network.c | 2 +- hw/usb/dev-smartcard-reader.c | 4 ++-- hw/virtio/virtio.c | 4 ++-- net/queue.c | 2 +- target/s390x/ioinst.c | 2 +- 34 files changed, 53 insertions(+), 52 deletions(-) -- 2.21.1 _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel
next reply other threads:[~2020-03-04 15:37 UTC|newest] Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-03-04 15:35 Philippe Mathieu-Daudé [this message] 2020-03-04 15:35 ` [Xen-devel] [PATCH 0/2] misc: Replace zero-length arrays with flexible array member Philippe Mathieu-Daudé 2020-03-04 15:36 ` [PATCH 1/2] misc: Replace zero-length arrays with flexible array member (automatic) Philippe Mathieu-Daudé 2020-03-04 15:36 ` [Xen-devel] " Philippe Mathieu-Daudé 2020-03-04 15:37 ` [PATCH 0/2] misc: Replace zero-length arrays with flexible array member Philippe Mathieu-Daudé 2020-03-04 15:37 ` [Xen-devel] " Philippe Mathieu-Daudé 2020-03-06 11:16 ` Igor Mammedov 2020-03-06 11:16 ` [Xen-devel] " Igor Mammedov -- strict thread matches above, loose matches on Subject: below -- 2020-03-04 0:51 Philippe Mathieu-Daudé 2020-03-04 11:14 ` Paolo Bonzini
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