This is a respin of a patch series from about a year ago[1]. I realized that we already had most of the code in recordmcount to figure out where we make calls to particular functions, so recording where we make calls to the integer division functions should be easy enough to add support for in the same codepaths. Looking back on the thread it seems like Mans was thinking along the same lines, although it wasn't obvious to me back then or even over the last few days when I wrote this. This series extends recordmcount to record the locations of the calls to the library functions on ARM builds, and puts those locations into a table that we use to patch instructions at boot. The first two patches are the recordmcount changes, while the last patch implements the runtime patching for modules and kernel code. The module part also hooks into the relocation patching code we already have. The RFC tag is because I'm thinking of splitting the recordmcount changes into a new program based on recordmcount so that we don't drag in a lot of corner cases and stuff when we don't need to. I suspect it will be cleaner that way too. Does anyone prefer one way or the other? Comments/feedback appreciated. [1] http://lkml.kernel.org/r/1383951632-6090-1-git-send-email-sboyd@xxxxxxxxxxxxxx Cc: Nicolas Pitre <nico@xxxxxxxxxxx> Cc: Arnd Bergmann <arnd@xxxxxxxx> Cc: Steven Rostedt <rostedt@xxxxxxxxxxx> Cc: Måns Rullgård <mans@xxxxxxxxx> Stephen Boyd (3): scripts: Allow recordmcount to be used without tracing enabled recordmcount: Record locations of __aeabi_{u}idiv() calls on ARM ARM: Replace calls to __aeabi_{u}idiv with udiv/sdiv instructions Makefile | 7 + arch/arm/Kconfig | 14 ++ arch/arm/kernel/module.c | 44 ++++++ arch/arm/kernel/setup.c | 34 +++++ arch/arm/kernel/vmlinux.lds.S | 13 ++ kernel/trace/Kconfig | 4 + scripts/Makefile.build | 15 +- scripts/recordmcount.c | 10 +- scripts/recordmcount.h | 337 +++++++++++++++++++++++++++++++++--------- scripts/recordmcount.pl | 11 +- 10 files changed, 406 insertions(+), 83 deletions(-) -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project -- To unsubscribe from this list: send the line "unsubscribe linux-arm-msm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
