1) perf build ============= The perf build process consists of several separated building blocks, which are linked together to form the perf binary: - libperf library (static) - perf builtin commands - traceevent library (static) - GTK ui library Several makefiles govern the perf build: - Makefile top level Makefile working as a wrapper that calls the main Makefile.perf with a -j option to do parallel builds. - Makefile.perf main makefile that triggers build of all perf objects including installation and documentation processing. - tools/build/Makefile.build main makefile of the build framework - tools/build/Build.include build framework generic definitions - Build makefiles makefiles that defines build objects Please refer to tools/build/Documentation/Build.txt for more information about build framework. 2) perf build ============= The Makefile.perf triggers the build framework for build objects: perf, libperf, gtk resulting in following objects: $ ls *-in.o gtk-in.o libperf-in.o perf-in.o Those objects are then used in final linking: libperf-gtk.so <- gtk-in.o libperf-in.o perf <- perf-in.o libperf-in.o NOTE this description is omitting other libraries involved, only focusing on build framework outcomes ket-rx-pump-back net-next plumbingsTobias Klauser
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authorArd Biesheuvel <ard.biesheuvel@linaro.org>2017-02-01 17:45:02 +0000
committerIngo Molnar <mingo@kernel.org>2017-02-01 21:17:49 +0100
commitc8f325a59cfc718d13a50fbc746ed9b415c25e92 (patch)
treed53fbdac9d0781e39a13b2ac6b2bd258cf3b4140 /fs/xfs/libxfs/xfs_attr_leaf.c
parentbf29bddf0417a4783da3b24e8c9e017ac649326f (diff)
efi/fdt: Avoid FDT manipulation after ExitBootServices()
Some AArch64 UEFI implementations disable the MMU in ExitBootServices(), after which unaligned accesses to RAM are no longer supported. Commit: abfb7b686a3e ("efi/libstub/arm*: Pass latest memory map to the kernel") fixed an issue in the memory map handling of the stub FDT code, but inadvertently created an issue with such firmware, by moving some of the FDT manipulation to after the invocation of ExitBootServices(). Given that the stub's libfdt implementation uses the ordinary, accelerated string functions, which rely on hardware handling of unaligned accesses, manipulating the FDT with the MMU off may result in alignment faults. So fix the situation by moving the update_fdt_memmap() call into the callback function invoked by efi_exit_boot_services() right before it calls the ExitBootServices() UEFI service (which is arguably a better place for it anyway) Note that disabling the MMU in ExitBootServices() is not compliant with the UEFI spec, and carries great risk due to the fact that switching from cached to uncached memory accesses halfway through compiler generated code (i.e., involving a stack) can never be done in a way that is architecturally safe. Fixes: abfb7b686a3e ("efi/libstub/arm*: Pass latest memory map to the kernel") Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Tested-by: Riku Voipio <riku.voipio@linaro.org> Cc: <stable@vger.kernel.org> Cc: mark.rutland@arm.com Cc: linux-efi@vger.kernel.org Cc: matt@codeblueprint.co.uk Cc: leif.lindholm@linaro.org Cc: linux-arm-kernel@lists.infradead.org Link: http://lkml.kernel.org/r/1485971102-23330-2-git-send-email-ard.biesheuvel@linaro.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'fs/xfs/libxfs/xfs_attr_leaf.c')