Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
perf/hw_breakpoint: Remove arch breakpoint hooks
PowerPC was the only user of these hooks, and has been refactored to no
longer require them. There is no need to keep them around, so remove
them to reduce complexity.
Signed-off-by: Benjamin Gray <bgray@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20230801011744.153973-8-bgray@linux.ibm.com
authored by
Benjamin Gray
and committed by
Michael Ellerman
53834a0c
58709f6f
-31
-3
include/linux/hw_breakpoint.h
-3
include/linux/hw_breakpoint.h
···
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extern int dbg_release_bp_slot(struct perf_event *bp);
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extern int reserve_bp_slot(struct perf_event *bp);
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extern void release_bp_slot(struct perf_event *bp);
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int arch_reserve_bp_slot(struct perf_event *bp);
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void arch_release_bp_slot(struct perf_event *bp);
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void arch_unregister_hw_breakpoint(struct perf_event *bp);
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extern void flush_ptrace_hw_breakpoint(struct task_struct *tsk);
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-28
kernel/events/hw_breakpoint.c
-28
kernel/events/hw_breakpoint.c
···
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return 0;
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}
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-
__weak int arch_reserve_bp_slot(struct perf_event *bp)
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{
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return 0;
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}
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__weak void arch_release_bp_slot(struct perf_event *bp)
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{
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}
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/*
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* Function to perform processor-specific cleanup during unregistration
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*/
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__weak void arch_unregister_hw_breakpoint(struct perf_event *bp)
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{
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/*
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* A weak stub function here for those archs that don't define
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* it inside arch/.../kernel/hw_breakpoint.c
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*/
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}
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/*
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* Constraints to check before allowing this new breakpoint counter.
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*
···
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enum bp_type_idx type;
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int max_pinned_slots;
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int weight;
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int ret;
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/* We couldn't initialize breakpoint constraints on boot */
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if (!constraints_initialized)
···
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if (max_pinned_slots > hw_breakpoint_slots_cached(type))
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return -ENOSPC;
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ret = arch_reserve_bp_slot(bp);
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if (ret)
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return ret;
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return toggle_bp_slot(bp, true, type, weight);
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}
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···
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enum bp_type_idx type;
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int weight;
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-
arch_release_bp_slot(bp);
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-
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type = find_slot_idx(bp_type);
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weight = hw_breakpoint_weight(bp);
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WARN_ON(toggle_bp_slot(bp, false, type, weight));
···
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{
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struct mutex *mtx = bp_constraints_lock(bp);
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arch_unregister_hw_breakpoint(bp);
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__release_bp_slot(bp, bp->attr.bp_type);
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bp_constraints_unlock(mtx);
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}