linux/arch/powerpc/kernel/trace/Makefile, branch master

powerpc/trace: Account for -fpatchable-function-entry support by toolchain

2024-10-31T00:00:52Z

So far, we have relied on the fact that gcc supports both -mprofile-kernel, as well as -fpatchable-function-entry, and clang supports neither. Our Makefile only checks for CONFIG_MPROFILE_KERNEL to decide which files to build. Clang has a feature request out [*] to implement -fpatchable-function-entry, and is unlikely to support -mprofile-kernel. Update our Makefile checks so that we pick up the correct files to build once clang picks up support for -fpatchable-function-entry. [*] https://github.com/llvm/llvm-project/issues/57031 Signed-off-by: Naveen N Rao Signed-off-by: Michael Ellerman Link: https://patch.msgid.link/20241030070850.1361304-2-hbathini@linux.ibm.com

powerpc/ftrace: Consolidate ftrace support into fewer files

2023-08-21T14:09:05Z

ftrace_low.S has just the _mcount stub and return_to_handler(). Merge this back into ftrace_mprofile.S and ftrace_64_pg.S to keep all ftrace code together, and to allow those to evolve independently. ftrace_mprofile.S is also not an entirely accurate name since this also holds ppc32 code. This will be all the more incorrect once support for -fpatchable-function-entry is added. Rename files here to more accurately describe the code: - ftrace_mprofile.S is renamed to ftrace_entry.S - ftrace_pg.c is renamed to ftrace_64_pg.c - ftrace_64_pg.S is rename to ftrace_64_pg_entry.S Signed-off-by: Naveen N Rao Reviewed-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://msgid.link/b900c9a8bba9d6c3c295e0f99886acf3e5bf6f7b.1687166935.git.naveen@kernel.org

powerpc64/ftrace: Move ELFv1 and -pg support code into a separate file

2023-08-21T14:09:05Z

ELFv1 support is deprecated and on the way out. Pre -mprofile-kernel ftrace support (-pg only) is very limited and is retained primarily for clang builds. It won't be necessary once clang lands support for -fpatchable-function-entry. Copy the existing ftrace code supporting these into ftrace_pg.c. ftrace.c can then be refactored and enhanced with a focus on ppc32 and ppc64 ELFv2. Signed-off-by: Naveen N Rao Reviewed-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://msgid.link/1eb6cc6c3141ddb77a2a25f8a9e83d83ff312b02.1687166935.git.naveen@kernel.org

powerpc/kcsan: Add exclusions from instrumentation

2023-02-10T11:19:56Z

Exclude various incompatible compilation units from KCSAN instrumentation. Signed-off-by: Rohan McLure Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20230206021801.105268-2-rmclure@linux.ibm.com

powerpc/ftrace: Use CONFIG_FUNCTION_TRACER instead of CONFIG_DYNAMIC_FTRACE

2022-05-19T13:11:29Z

Since commit 0c0c52306f47 ("powerpc: Only support DYNAMIC_FTRACE not static"), CONFIG_DYNAMIC_FTRACE is always selected when CONFIG_FUNCTION_TRACER is selected. To avoid confusion and have the reader wonder what's happen when CONFIG_FUNCTION_TRACER is selected and CONFIG_DYNAMIC_FTRACE is not, use CONFIG_FUNCTION_TRACER in ifdefs instead of CONFIG_DYNAMIC_FTRACE. As CONFIG_FUNCTION_GRAPH_TRACER depends on CONFIG_FUNCTION_TRACER, ftrace.o doesn't need to appear for both symbols in Makefile. Then as ftrace.o is built only when CONFIG_FUNCTION_TRACER is selected ifdef CONFIG_FUNCTION_TRACER is not needed in ftrace.c, and since it implies CONFIG_DYNAMIC_FTRACE, CONFIG_DYNAMIC_FTRACE is not needed in ftrace.c Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/628d357503eb90b4a034f99b7df516caaff4d279.1652074503.git.christophe.leroy@csgroup.eu

powerpc/ftrace: Don't include ftrace.o for CONFIG_FTRACE_SYSCALLS

2022-05-19T13:11:29Z

Since commit 7bea7ac0ca01 ("powerpc/syscalls: Fix syscall tracing") ftrace.o is not needed anymore for CONFIG_FTRACE_SYSCALLS. Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/275932a5d61543b825ff9a64f61abed6da5d4a2a.1652074503.git.christophe.leroy@csgroup.eu

powerpc/ftrace: Remove ftrace_32.S

2022-02-12T11:47:28Z

Functions in ftrace_32.S are common with PPC64. Reuse the ones defined for PPC64 with slight modification when required. Signed-off-by: Christophe Leroy [mpe: Squash in fixup diff from Christophe] Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/5e837fc190504c4ef834272e70d60ae33f175d49.1640017960.git.christophe.leroy@csgroup.eu

powerpc: Enable kcov

2019-02-23T10:04:32Z

kcov provides kernel coverage data that's useful for fuzzing tools like syzkaller. Wire up kcov support on powerpc. Disable kcov instrumentation on the same files where we currently disable gcov and UBSan instrumentation, plus some additional exclusions which appear necessary to boot on book3e machines. Signed-off-by: Andrew Donnellan Acked-by: Dmitry Vyukov Tested-by: Daniel Axtens # e6500 Signed-off-by: Michael Ellerman

powerpc: Add -Werror at arch/powerpc level

2018-10-18T13:56:17Z

Back when I added -Werror in commit ba55bd74360e ("powerpc: Add configurable -Werror for arch/powerpc") I did it by adding it to most of the arch Makefiles. At the time we excluded math-emu, because apparently it didn't build cleanly. But that seems to have been fixed somewhere in the interim. So move the -Werror addition to the top-level of the arch, this saves us from repeating it in every Makefile and means we won't forget to add it to any new sub-dirs. Signed-off-by: Michael Ellerman

powerpc: consolidate -mno-sched-epilog into FTRACE flags

2018-09-19T12:01:56Z

Signed-off-by: Nicholas Piggin Reviewed-by: Joel Stanley Signed-off-by: Michael Ellerman