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 using the same design. 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 copies and reworks recordmcount to record the locations of the calls to the library integer division functions on ARM builds, and puts those locations into a table that we use to patch instructions at boot. The first patch adds the recorduidiv program, and the second patch implements the runtime patching for modules and kernel code. The module part hooks into the relocation patching code we already have. The discussion surrounding adding ARMv7VE so that this patchset isn't as necessary is still on going, so I'm just sending out these patches for now. Assuming we can come to a conclusion on how to implement ARMv7VE I'll finish up those patches. Comments/feedback appreciated. Changes from v1: * Add suport for PJ4 udiv/sdiv mrc opcodes * Create a new program for recording uidiv instead of modifying recordmcount [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> Cc: Thomas Petazzoni <thomas.petazzoni@xxxxxxxxxxxxxxxxxx> Cc: Michal Marek <mmarek@xxxxxxxx> Cc: Russell King - ARM Linux <linux@xxxxxxxxxxxxxxxx> Stephen Boyd (2): scripts: Add a recorduidiv program ARM: Replace calls to __aeabi_{u}idiv with udiv/sdiv instructions arch/arm/Kconfig | 14 + arch/arm/include/asm/cputype.h | 8 +- arch/arm/include/asm/setup.h | 3 + arch/arm/kernel/module.c | 40 +++ arch/arm/kernel/setup.c | 68 ++++ arch/arm/kernel/vmlinux.lds.S | 13 + scripts/Makefile | 1 + scripts/Makefile.build | 17 +- scripts/recorduidiv.c | 745 +++++++++++++++++++++++++++++++++++++++++ 9 files changed, 906 insertions(+), 3 deletions(-) create mode 100644 scripts/recorduidiv.c -- 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-kbuild" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
