I've left this to ~rot~ age out in the sun for a while, apologies for that. One early new-year resolution for me is to maintain a shorter resend timeout on this.
This is the continuation of [1] where I'm hunting down preempt_schedule_irq() callers because of [2]. I've looked at users of preempt_schedule_irq(), and made sure they didn't have one of those useless loops. The list of offenders is: $ grep -r -I "preempt_schedule_irq" arch/ | cut -d/ -f2 | sort | uniq arc arm arm64 c6x csky h8300 ia64 m68k microblaze mips nds32 nios2 parisc powerpc riscv s390 sh sparc x86 xtensa Regarding that loop, archs seem to fall in 3 categories: A) Those that don't have the loop B) Those that have a small need_resched() loop around the preempt_schedule_irq() callsite C) Those that branch to some more generic code further up the entry code and eventually branch back to preempt_schedule_irq() arc, m68k, nios2 fall in A) sparc, ia64, s390 fall in C) all the others fall in B) I've written patches for B). As of 5.3 mainline contains those for: - arm64 - mips - x86 - powerpc - nds32 I've also got acks/reviews but haven't seen in any tree yet for: - c6x - csky - riscv - xtensa The remaining ones for which I haven't had any reply at all are - h8300 - microblaze - sh - sh64 Build-tested: - h8300 - c6x - microblaze - riscv No major change since v1 other than rebasing on top of 5.4 and collecting Reviewed-By / Acked-By. Thanks, Valentin [1]: https://lore.kernel.org/lkml/[email protected]/ [2]: https://lore.kernel.org/lkml/[email protected]/ Valentin Schneider (9): sched/core: Fix preempt_schedule() interrupt return comment c6x: entry: Remove unneeded need_resched() loop csky: entry: Remove unneeded need_resched() loop h8300: entry: Remove unneeded need_resched() loop microblaze: entry: Remove unneeded need_resched() loop RISC-V: entry: Remove unneeded need_resched() loop sh: entry: Remove unneeded need_resched() loop sh64: entry: Remove unneeded need_resched() loop xtensa: entry: Remove unneeded need_resched() loop arch/c6x/kernel/entry.S | 3 +-- arch/csky/kernel/entry.S | 4 ---- arch/h8300/kernel/entry.S | 3 +-- arch/microblaze/kernel/entry.S | 5 ----- arch/riscv/kernel/entry.S | 3 +-- arch/sh/kernel/cpu/sh5/entry.S | 5 +---- arch/sh/kernel/entry-common.S | 4 +--- arch/xtensa/kernel/entry.S | 2 +- kernel/sched/core.c | 7 +++---- 9 files changed, 9 insertions(+), 27 deletions(-) -- 2.22.0
