# git rev-parse -q --verify a9f675f950a07d5c1dbcbb97aabac56f5ed085e3^{commit} a9f675f950a07d5c1dbcbb97aabac56f5ed085e3 already have revision, skipping fetch # git checkout -q -f -B kisskb a9f675f950a07d5c1dbcbb97aabac56f5ed085e3 # git clean -qxdf # < git log -1 # commit a9f675f950a07d5c1dbcbb97aabac56f5ed085e3 # Author: Milton Miller # Date: Thu Jul 16 09:37:04 2020 +1000 # # powerpc/vdso: Fix vdso cpu truncation # # The code in vdso_cpu_init that exposes the cpu and numa node to # userspace via SPRG_VDSO incorrctly masks the cpu to 12 bits. This means # that any kernel running on a box with more than 4096 threads (NR_CPUS # advertises a limit of of 8192 cpus) would expose userspace to two cpu # contexts running at the same time with the same cpu number. # # Note: I'm not aware of any distro shipping a kernel with support for more # than 4096 threads today, nor of any system image that currently exceeds # 4096 threads. Found via code browsing. # # Fixes: 18ad51dd342a7eb09dbcd059d0b451b616d4dafc ("powerpc: Add VDSO version of getcpu") # Signed-off-by: Milton Miller # Signed-off-by: Anton Blanchard # Signed-off-by: Michael Ellerman # Link: https://lore.kernel.org/r/20200715233704.1352257-1-anton@ozlabs.org # < /opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc --version # < /opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux-ld --version # < git log --format=%s --max-count=1 a9f675f950a07d5c1dbcbb97aabac56f5ed085e3 # < make -s -j 8 ARCH=powerpc O=/kisskb/build/powerpc-next_mpc85xx_defconfig_powerpc-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux- mpc85xx_defconfig # < make -s -j 8 ARCH=powerpc O=/kisskb/build/powerpc-next_mpc85xx_defconfig_powerpc-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux- help # make -s -j 8 ARCH=powerpc O=/kisskb/build/powerpc-next_mpc85xx_defconfig_powerpc-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux- olddefconfig # make -s -j 8 ARCH=powerpc O=/kisskb/build/powerpc-next_mpc85xx_defconfig_powerpc-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux- In file included from /kisskb/src/include/linux/kernel.h:11:0, from /kisskb/src/include/linux/list.h:9, from /kisskb/src/include/linux/module.h:12, from /kisskb/src/drivers/net/ethernet/freescale/fs_enet/mac-scc.c:15: /kisskb/src/drivers/net/ethernet/freescale/fs_enet/mac-scc.c: In function 'allocate_bd': /kisskb/src/include/linux/err.h:22:49: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast] #define IS_ERR_VALUE(x) unlikely((unsigned long)(void *)(x) >= (unsigned long)-MAX_ERRNO) ^ /kisskb/src/include/linux/compiler.h:78:42: note: in definition of macro 'unlikely' # define unlikely(x) __builtin_expect(!!(x), 0) ^ /kisskb/src/drivers/net/ethernet/freescale/fs_enet/mac-scc.c:139:6: note: in expansion of macro 'IS_ERR_VALUE' if (IS_ERR_VALUE(fep->ring_mem_addr)) ^ /kisskb/src/arch/powerpc/boot/dts/fsl/mpc8541cds.dts:330.3-21: Warning (pci_device_bus_num): /pci@e0008000/i8259@19000:bus-range: PCI bus number 1 out of range, expected (0 - 0) /kisskb/src/arch/powerpc/boot/dts/fsl/mpc8555cds.dts:330.3-21: Warning (pci_device_bus_num): /pci@e0008000/i8259@19000:bus-range: PCI bus number 1 out of range, expected (0 - 0) INFO: Uncompressed kernel (size 0xcc7628) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xd00000) INFO: Uncompressed kernel (size 0xcc7628) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xd00000) INFO: Uncompressed kernel (size 0xcc7628) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xd00000) INFO: Uncompressed kernel (size 0xcc7628) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xd00000) INFO: Uncompressed kernel (size 0xcc7628) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xd00000) INFO: Uncompressed kernel (size 0xcc7628) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xd00000) INFO: Uncompressed kernel (size 0xcc7628) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xd00000) INFO: Uncompressed kernel (size 0xcb6e24) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xd00000) Image Name: Linux-5.8.0-rc2-31953-ga9f675f95 Created: Thu Jul 16 18:40:35 2020 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 6226851 Bytes = 6080.91 KiB = 5.94 MiB Load Address: 00000000 Entry Point: 00000000 INFO: Uncompressed kernel (size 0xcc7628) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xd00000) Image Name: Linux-5.8.0-rc2-31953-ga9f675f95 Created: Thu Jul 16 18:40:36 2020 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 6261659 Bytes = 6114.90 KiB = 5.97 MiB Load Address: 00d00000 Entry Point: 00d002a4 INFO: Uncompressed kernel (size 0xcc7628) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xd00000) Image Name: Linux-5.8.0-rc2-31953-ga9f675f95 Created: Thu Jul 16 18:40:36 2020 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 6259889 Bytes = 6113.17 KiB = 5.97 MiB Load Address: 00d00000 Entry Point: 00d00314 INFO: Uncompressed kernel (size 0xcc7628) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xd00000) Image Name: Linux-5.8.0-rc2-31953-ga9f675f95 Created: Thu Jul 16 18:40:36 2020 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 6260039 Bytes = 6113.32 KiB = 5.97 MiB Load Address: 00d00000 Entry Point: 00d002a4 Image Name: Linux-5.8.0-rc2-31953-ga9f675f95 Created: Thu Jul 16 18:40:36 2020 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 6259377 Bytes = 6112.67 KiB = 5.97 MiB Load Address: 00d00000 Entry Point: 00d002a4 INFO: Uncompressed kernel (size 0xcc7628) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xd00000) INFO: Uncompressed kernel (size 0xcc7628) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xd00000) Image Name: Linux-5.8.0-rc2-31953-ga9f675f95 Created: Thu Jul 16 18:40:36 2020 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 6261306 Bytes = 6114.56 KiB = 5.97 MiB Load Address: 00d00000 Entry Point: 00d002a4 Image Name: Linux-5.8.0-rc2-31953-ga9f675f95 Created: Thu Jul 16 18:40:36 2020 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 6259757 Bytes = 6113.04 KiB = 5.97 MiB Load Address: 00d00000 Entry Point: 00d002a4 Image Name: Linux-5.8.0-rc2-31953-ga9f675f95 Created: Thu Jul 16 18:40:36 2020 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 6259761 Bytes = 6113.05 KiB = 5.97 MiB Load Address: 00d00000 Entry Point: 00d002a4 INFO: Uncompressed kernel (size 0xcc7628) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xd00000) INFO: Uncompressed kernel (size 0xcc7628) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xd00000) INFO: Uncompressed kernel (size 0xcc7628) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xd00000) Image Name: Linux-5.8.0-rc2-31953-ga9f675f95 Created: Thu Jul 16 18:40:38 2020 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 6261733 Bytes = 6114.97 KiB = 5.97 MiB Load Address: 00d00000 Entry Point: 00d002a4 Image Name: Linux-5.8.0-rc2-31953-ga9f675f95 Created: Thu Jul 16 18:40:39 2020 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 6259263 Bytes = 6112.56 KiB = 5.97 MiB Load Address: 00d00000 Entry Point: 00d002a4 Image Name: Linux-5.8.0-rc2-31953-ga9f675f95 Created: Thu Jul 16 18:40:39 2020 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 6259288 Bytes = 6112.59 KiB = 5.97 MiB Load Address: 00d00000 Entry Point: 00d00314 Image Name: Linux-5.8.0-rc2-31953-ga9f675f95 Created: Thu Jul 16 18:40:40 2020 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 6261406 Bytes = 6114.65 KiB = 5.97 MiB Load Address: 00d00000 Entry Point: 00d002a4 Image Name: Linux-5.8.0-rc2-31953-ga9f675f95 Created: Thu Jul 16 18:40:40 2020 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 6259837 Bytes = 6113.12 KiB = 5.97 MiB Load Address: 00d00000 Entry Point: 00d002a4 Image Name: Linux-5.8.0-rc2-31953-ga9f675f95 Created: Thu Jul 16 18:40:40 2020 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 6259289 Bytes = 6112.59 KiB = 5.97 MiB Load Address: 00d00000 Entry Point: 00d00314 Image Name: Linux-5.8.0-rc2-31953-ga9f675f95 Created: Thu Jul 16 18:40:40 2020 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 6259852 Bytes = 6113.14 KiB = 5.97 MiB Load Address: 00d00000 Entry Point: 00d00314 Image Name: Linux-5.8.0-rc2-31953-ga9f675f95 Created: Thu Jul 16 18:40:40 2020 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 6259624 Bytes = 6112.91 KiB = 5.97 MiB Load Address: 00d00000 Entry Point: 00d00314 Completed OK # rm -rf /kisskb/build/powerpc-next_mpc85xx_defconfig_powerpc-gcc4.9 # Build took: 0:03:04.258933