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authorHawking Zhang <Hawking.Zhang@amd.com>2025-06-16 17:17:30 +0800
committerAlex Deucher <alexander.deucher@amd.com>2025-06-24 10:04:13 -0400
commitb9c58f4e325c01ec8838da2e86befe4b1b91c2cc (patch)
treedc854adbab774c5db18433a71261cfddbaad463e /tools/perf/scripts/python/bin/stackcollapse-record
parentc9df2dcf9054273c7f493b7912744de6eefd2aea (diff)
downloadkernel-b9c58f4e325c01ec8838da2e86befe4b1b91c2cc.tar.gz
drm/amdgpu: Generalize is_multi_chiplet with a common helper v2
It is not necessary to be ip generation specific v2: rename the helper to is_multi_aid (Lijo) Signed-off-by: Hawking Zhang <Hawking.Zhang@amd.com> Reviewed-by: Lijo Lazar <lijo.lazar@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'tools/perf/scripts/python/bin/stackcollapse-record')
0 files changed, 0 insertions, 0 deletions
generated by cgit v1.2.3 (git 2.46.0) at 2026-08-09 20:52:51 +0000
d> compiler un-inlining While this function is a static inline, and is only used once in local scope, certain Kconfig variations may cause it to be compiled as a standalone function: 89231bf0 <idle_init>: 89231bf0: 83 05 60 d9 45 89 01 addl $0x1,0x8945d960 89231bf7: 55 push %ebp Resulting in this build failure: WARNING: modpost: vmlinux.o(.text.unlikely+0x7fd5): Section mismatch in reference from the function idle_init() to the function .init.text:fork_idle() The function idle_init() references the function __init fork_idle(). This is often because idle_init lacks a __init annotation or the annotation of fork_idle is wrong. ERROR: modpost: Section mismatches detected. Certain USBSAN options x86-32 builds with CONFIG_CC_OPTIMIZE_FOR_SIZE=y seem to be causing this. So mark idle_init() as __always_inline to work around this compiler bug/feature. Signed-off-by: Ingo Molnar <mingo@kernel.org> 2021-05-12sched/core: Initialize the idle task with preemption disabledValentin Schneider As pointed out by commit de9b8f5dcbd9 ("sched: Fix crash trying to dequeue/enqueue the idle thread") init_idle() can and will be invoked more than once on the same idle task. At boot time, it is invoked for the boot CPU thread by sched_init(). Then smp_init() creates the threads for all the secondary CPUs and invokes init_idle() on them. As the hotplug machinery brings the secondaries to life, it will issue calls to idle_thread_get(), which itself invokes init_idle() yet again. In this case it's invoked twice more per secondary: at _cpu_up(), and at bringup_cpu(). Given smp_init() already initializes the idle tasks for all *possible* CPUs, no further initialization should be required. Now, removing init_idle() from idle_thread_get() exposes some interesting expectations with regards to the idle task's preempt_count: the secondary startup always issues a preempt_disable(), requiring some reset of the preempt count to 0 between hot-unplug and hotplug, which is currently served by idle_thread_get() -> idle_init(). Given the idle task is supposed to have preemption disabled once and never see it re-enabled, it seems that what we actually want is to initialize its preempt_count to PREEMPT_DISABLED and leave it there. Do that, and remove init_idle() from idle_thread_get(). Secondary startups were patched via coccinelle: @begone@ @@ -preempt_disable(); ... cpu_startup_entry(CPUHP_AP_ONLINE_IDLE); Signed-off-by: Valentin Schneider <valentin.schneider@arm.com> Signed-off-by: Ingo Molnar <mingo@kernel.org> Acked-by: Peter Zijlstra <peterz@infradead.org> Link: https://lore.kernel.org/r/20210512094636.2958515-1-valentin.schneider@arm.com 2021-01-22kthread: Extract KTHREAD_IS_PER_CPUPeter Zijlstra There is a need to distinguish geniune per-cpu kthreads from kthreads that happen to have a single CPU affinity. Geniune per-cpu kthreads are kthreads that are CPU affine for correctness, these will obviously have PF_KTHREAD set, but must also have PF_NO_SETAFFINITY set, lest userspace modify their affinity and ruins things. However, these two things are not sufficient, PF_NO_SETAFFINITY is also set on other tasks that have their affinities controlled through other means, like for instance workqueues. Therefore another bit is needed; it turns out kthread_create_per_cpu() already has such a bit: KTHREAD_IS_PER_CPU, which is used to make kthread_park()/kthread_unpark() work correctly. Expose this flag and remove the implicit setting of it from kthread_create_on_cpu(); the io_uring usage of it seems dubious at best. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Valentin Schneider <valentin.schneider@arm.com> Tested-by: Valentin Schneider <valentin.schneider@arm.com> Link: https://lkml.kernel.org/r/20210121103506.557620262@infradead.org