# git rev-parse -q --verify b03897cf318dfc47de33a7ecbc7655584266f034^{commit} b03897cf318dfc47de33a7ecbc7655584266f034 already have revision, skipping fetch # git checkout -q -f -B kisskb b03897cf318dfc47de33a7ecbc7655584266f034 # git clean -qxdf # < git log -1 # commit b03897cf318dfc47de33a7ecbc7655584266f034 # Author: Gautham R. Shenoy # Date: Wed Jul 18 14:03:16 2018 +0530 # # powerpc/powernv: Fix save/restore of SPRG3 on entry/exit from stop (idle) # # On 64-bit servers, SPRN_SPRG3 and its userspace read-only mirror # SPRN_USPRG3 are used as userspace VDSO write and read registers # respectively. # # SPRN_SPRG3 is lost when we enter stop4 and above, and is currently not # restored. As a result, any read from SPRN_USPRG3 returns zero on an # exit from stop4 (Power9 only) and above. # # Thus in this situation, on POWER9, any call from sched_getcpu() always # returns zero, as on powerpc, we call __kernel_getcpu() which relies # upon SPRN_USPRG3 to report the CPU and NUMA node information. # # Fix this by restoring SPRN_SPRG3 on wake up from a deep stop state # with the sprg_vdso value that is cached in PACA. # # Fixes: e1c1cfed5432 ("powerpc/powernv: Save/Restore additional SPRs for stop4 cpuidle") # Cc: stable@vger.kernel.org # v4.14+ # Reported-by: Florian Weimer # Signed-off-by: Gautham R. Shenoy # Reviewed-by: Michael Ellerman # Signed-off-by: Michael Ellerman # < /opt/cross/kisskb/gcc-5.3.0-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc --version # < git log --format=%s --max-count=1 b03897cf318dfc47de33a7ecbc7655584266f034 # < make -s -j 80 ARCH=powerpc O=/kisskb/build/powerpc-fixes_amigaone_defconfig_powerpc-5.3 CROSS_COMPILE=/opt/cross/kisskb/gcc-5.3.0-nolibc/powerpc64-linux/bin/powerpc64-linux- amigaone_defconfig WARNING: unmet direct dependencies detected for NOT_COHERENT_CACHE Depends on [n]: 4xx [=n] || PPC_8xx [=n] || E200 [=n] || PPC_MPC512x [=n] || GAMECUBE_COMMON [=n] Selected by [y]: - AMIGAONE [=y] && 6xx [=y] && BROKEN_ON_SMP [=y] WARNING: unmet direct dependencies detected for NOT_COHERENT_CACHE Depends on [n]: 4xx [=n] || PPC_8xx [=n] || E200 [=n] || PPC_MPC512x [=n] || GAMECUBE_COMMON [=n] Selected by [y]: - AMIGAONE [=y] && 6xx [=y] && BROKEN_ON_SMP [=y] # make -s -j 80 ARCH=powerpc O=/kisskb/build/powerpc-fixes_amigaone_defconfig_powerpc-5.3 CROSS_COMPILE=/opt/cross/kisskb/gcc-5.3.0-nolibc/powerpc64-linux/bin/powerpc64-linux- WARNING: unmet direct dependencies detected for NOT_COHERENT_CACHE Depends on [n]: 4xx [=n] || PPC_8xx [=n] || E200 [=n] || PPC_MPC512x [=n] || GAMECUBE_COMMON [=n] Selected by [y]: - AMIGAONE [=y] && 6xx [=y] && BROKEN_ON_SMP [=y] WARNING: unmet direct dependencies detected for NOT_COHERENT_CACHE Depends on [n]: 4xx [=n] || PPC_8xx [=n] || E200 [=n] || PPC_MPC512x [=n] || GAMECUBE_COMMON [=n] Selected by [y]: - AMIGAONE [=y] && 6xx [=y] && BROKEN_ON_SMP [=y] /kisskb/src/net/Makefile:24: CC cannot link executables. Skipping bpfilter. /kisskb/src/net/Makefile:24: CC cannot link executables. Skipping bpfilter. INFO: Uncompressed kernel (size 0x5cb224) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0x600000) Image Name: Linux-4.18.0-rc3+ Created: Thu Jul 19 02:46:34 2018 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 2940496 Bytes = 2871.58 kB = 2.80 MB Load Address: 00000000 Entry Point: 00000000 Image Name: Linux-4.18.0-rc3+ Created: Thu Jul 19 02:46:34 2018 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 2963344 Bytes = 2893.89 kB = 2.83 MB Load Address: 00800000 Entry Point: 00800108 Completed OK # rm -rf /kisskb/build/powerpc-fixes_amigaone_defconfig_powerpc-5.3 # Build took: 0:00:45.437876