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charset=us-ascii Content-Disposition: inline In-Reply-To: <297f30d8ba75cb0e9ebe0a776d96c19750105570.1550745320.git.christophe.leroy@c-s.fr> User-Agent: Mutt/1.5.24 (2015-08-30) X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linuxppc-dev@lists.ozlabs.org, Paul Mackerras , linux-kernel@vger.kernel.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" Hi, On Thu, Feb 21, 2019 at 10:37:55AM +0000, Christophe Leroy wrote: > Use SPRN_SPRG2 to store the current thread PGDIR and > avoid reading thread_struct.pgdir at every TLB miss. > This patch causes a number of silent (no crash) qemu boot stalls in -next. See https://kerneltests.org/builders/qemu-ppc-next/builds/1080/steps/qemubuildcommand/logs/stdio for an example. Unfortunately, it is not possible to revert the patch due to subsequent patches, so I was unable to test a revert. Bisect log is attached. Guenter --- # bad: [cf08baa29613dd899954089e7cc7dba1d478b365] Add linux-next specific files for 20190306 # good: [1c163f4c7b3f621efff9b28a47abb36f7378d783] Linux 5.0 git bisect start 'HEAD' 'v5.0' # bad: [6cc8f3499ec8d31904ab9083980a91736512cb37] Merge remote-tracking branch 'vfs/for-next' git bisect bad 6cc8f3499ec8d31904ab9083980a91736512cb37 # good: [63bdf4284c38a48af21745ceb148a087b190cd21] Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 git bisect good 63bdf4284c38a48af21745ceb148a087b190cd21 # good: [520b5fc601ab760fee7ea0c403b42d04e8ebfd93] Merge remote-tracking branch 'arm-soc/for-next' git bisect good 520b5fc601ab760fee7ea0c403b42d04e8ebfd93 # bad: [d7f54e4e0d4e90f5df78da8d6a830bafad3b535a] Merge remote-tracking branch 'xtensa/xtensa-for-next' git bisect bad d7f54e4e0d4e90f5df78da8d6a830bafad3b535a # good: [0c1a78523542fb3d2e6c5ac7955c8ca8f6482e6f] Merge remote-tracking branch 'clk/clk-next' git bisect good 0c1a78523542fb3d2e6c5ac7955c8ca8f6482e6f # bad: [fb0b0a73b223fc113e961b1d921322844e9c30d9] powerpc: Enable kcov git bisect bad fb0b0a73b223fc113e961b1d921322844e9c30d9 # good: [d0055df0c9c1471c389197a69f43e300185a75aa] Merge branch 'topic/dma' into next git bisect good d0055df0c9c1471c389197a69f43e300185a75aa # good: [0df977eafc792a5365a7f81d8d5920132e03afad] powerpc/6xx: Don't use SPRN_SPRG2 for storing stack pointer while in RTAS git bisect good 0df977eafc792a5365a7f81d8d5920132e03afad # bad: [665bed2386e5dc29844ad78c7ef1464664b103ec] powerpc/8xx: replace most #ifdef by IS_ENABLED() in 8xx_mmu.c git bisect bad 665bed2386e5dc29844ad78c7ef1464664b103ec # bad: [78ca1108b10927b3d068c8da91352b0f4cd01fc5] powerpc/book3s32: Reorder _PAGE_XXX flags to simplify TLB handling git bisect bad 78ca1108b10927b3d068c8da91352b0f4cd01fc5 # bad: [a8a121995b2e4f227fddc534c6bd5f1c02cbe2ee] powerpc/603: Don't handle kernel page TLB misses when not need git bisect bad a8a121995b2e4f227fddc534c6bd5f1c02cbe2ee # bad: [2c12393f577396a51b7e0537bd3eb29dcc26dc1b] powerpc/603: use physical address directly in TLB miss handlers. git bisect bad 2c12393f577396a51b7e0537bd3eb29dcc26dc1b # bad: [93c4a162b014d238a287f8264adb25c009c79e61] powerpc/6xx: Store PGDIR physical address in a SPRG git bisect bad 93c4a162b014d238a287f8264adb25c009c79e61 # first bad commit: [93c4a162b014d238a287f8264adb25c009c79e61] powerpc/6xx: Store PGDIR physical address in a SPRG