From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wm1-f71.google.com (mail-wm1-f71.google.com [209.85.128.71]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9338643F0B0 for ; Wed, 12 Aug 2026 15:33:41 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.71 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786548831; cv=none; b=bodtJXuk3lOaKrTRc2xmC2JI9q+0yrusGDFUJrpIMTdR+neCWklT3LBeYZ+KHrSTL6xe0o2ozOifPBeTOGvsGd1NzEmcok0Tz9OoXyMPNgZlAdJpfMPDVVieU8pXQhTjQo5CazMYt+eN+hALC/SuQ4Kk6stAbvc/sbLT/5qDgXk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786548831; c=relaxed/simple; bh=+u6ruKpjI/mWvcOQC900P9kpILcTPVL6PLWAoMyJvcw=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=t7rnd8ybHl1aBTsOl/dweocYF4vG2u6i0Q7vCVqaQ/aOnr6rv5rdRR5edsa67/z0us6qVZJJQZqavaLRzQTIsgckvVrkZ66ZNGm/SB7tyOkoJ097p7kMuXlt3txNpjcu1OMUUXe5S6wYKOvBwfT/EILtgmhJ96ZbjMB3jAv6/Wc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--vdonnefort.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=SYxnZkU4; arc=none smtp.client-ip=209.85.128.71 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--vdonnefort.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="SYxnZkU4" Received: by mail-wm1-f71.google.com with SMTP id 5b1f17b1804b1-4955e865174so5791345e9.3 for ; Wed, 12 Aug 2026 08:33:40 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1786548818; x=1787153618; darn=vger.kernel.org; h=content-type:cc:to:from:subject:message-id:references:mime-version :in-reply-to:date:from:to:cc:subject:date:message-id:reply-to :content-type; bh=Al1AI1+q4Ne9/j+b+G1Wtjun9dFKpJAeJ0Aj+hRFSRI=; b=SYxnZkU4UukSVBTCDUEzBA2LvfL8HvOgSwzLoZzXepFGsTEIPEpCXEKpV46o8EfJtL VtGeK8s3MlbuvgOKBlZrJRenb5MfVKg/y+2L9PdQBBoe+2mUEkrzmzBeIZxxrZBZK9OL q7rwUslLLyh4Dh/hprbH8T0YhQUfoABGy6HVqwm2AvZoODVjuoxKwBh43+/EetqQ2uJD DLHZ+iU8ufdfP6+bIGBLku9qZFew6Mg+2xVowKR3Ay0naaM9mcHbz7+poNIwAffW31IN nB3NEAXmyc6blIwZq7W+PNvgGkrIn8iD2MBjAKRGYvjYseO/jDv2Mmmv8ZTEccFJv8jd qdmw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1786548818; x=1787153618; h=content-type:cc:to:from:subject:message-id:references:mime-version :in-reply-to:date:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to:content-type; bh=Al1AI1+q4Ne9/j+b+G1Wtjun9dFKpJAeJ0Aj+hRFSRI=; b=SMRqnY9gmTa7PtjgVP+T+PrMKpHwHGBiyD3BKZsAu0ah2jXpG5YFBZIwCqE+cIAJKt 5VpQSKs/qYD3HZUMfhzcEfvxeOzana6cEVdpz8aGJkFIepGBzcF4eL/M18HReTIqowL0 QhnoZ02rRnKFgBTZz9eWq3bTQCjLdl2kU/Tq0hVEzfqlKmyJg+5jkZ10YjFY6lgdUEZB 3wbKl+6tkkzxcuDVbNIYmqCRy4ycsh3jmZ7SPrDsyHY5HN6TT1bgMnR/1zAdumdFKLc2 z7MbzPlXXfOPxWKlR7u6ky/poKklXubUEQ6WQHkCAsuXhBXv6ZNNt5Tu40Urrj2jwuxJ /snw== X-Forwarded-Encrypted: i=1; AHgh+RqTQh/KwhCG9exBNViRd88kxUl0Y16+CbZp0hxV4hu4lFj+6d7EjVPBQc4c+ZMhIA6wPbn1Po2qyxT4vQY17zjhwNQ=@vger.kernel.org X-Gm-Message-State: AOJu0YxW89QdGIi5wPurbRS/AWiIarbBreU0tJBzRnAFAhFWeamZdnXY CUieasLbqWkidnWGnj42L/JF7uCHyuob/Mm6+QWLsSKScH3ARiln/65j2bK4fVZq8HRvLWCcpvp luORGYFWaHaING9hvE/l8wg== X-Received: from wmj11.prod.google.com ([2002:a05:600c:24b:b0:493:d1ba:af39]) (user=vdonnefort job=prod-delivery.src-stubby-dispatcher) by 2002:a05:600c:8b2b:b0:499:4b5e:4077 with SMTP id 5b1f17b1804b1-4997c1306e9mr93335985e9.19.1786548817630; Wed, 12 Aug 2026 08:33:37 -0700 (PDT) Date: Wed, 12 Aug 2026 16:33:10 +0100 In-Reply-To: <20260812153311.2328812-1-vdonnefort@google.com> Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260812153311.2328812-1-vdonnefort@google.com> X-Mailer: git-send-email 2.55.0.691.gc56d675ccc-goog Message-ID: <20260812153311.2328812-10-vdonnefort@google.com> Subject: [PATCH v4 9/9] ring-buffer: Make nr_pages unsigned int From: Vincent Donnefort To: rostedt@goodmis.org, mhiramat@kernel.org, linux-trace-kernel@vger.kernel.org Cc: mathieu.desnoyers@efficios.com, kernel-team@android.com, linux-kernel@vger.kernel.org, Vincent Donnefort Content-Type: text/plain; charset="UTF-8" nr_pages is an int or unsigned int almost everywhere already. Also, all the meta-data ring_buffer_desc, ring_buffer_cpu_meta and trace_buffer_meta allowing to share information about the ring buffer are already capping this value to 32-bits. Make ring_buffer_per_cpu::nr_pages unsigned and align all the users to it. As a side effect, this makes ring_buffer_per_cpu slightly smaller. Signed-off-by: Vincent Donnefort diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c index 990a904cefe8..2fccb950e593 100644 --- a/kernel/trace/ring_buffer.c +++ b/kernel/trace/ring_buffer.c @@ -519,7 +519,7 @@ struct ring_buffer_per_cpu { arch_spinlock_t lock; struct lock_class_key lock_key; struct buffer_data_page *free_page; - unsigned long nr_pages; + unsigned int nr_pages; unsigned int current_context; struct list_head *pages; /* pages generation counter, incremented when the list changes */ @@ -561,7 +561,7 @@ struct ring_buffer_per_cpu { struct ring_buffer_remote *remote; /* ring buffer pages to update, > 0 to add, < 0 to remove */ - long nr_pages_to_update; + int nr_pages_to_update; struct list_head new_pages; /* new pages to add */ struct work_struct update_pages_work; struct completion update_done; @@ -1669,7 +1669,7 @@ static void rb_check_pages(struct ring_buffer_per_cpu *cpu_buffer) * This is used to help find the next per cpu subbuffer within a mapped range. */ static unsigned long -rb_range_align_subbuf(unsigned long addr, int subbuf_size, int nr_subbufs) +rb_range_align_subbuf(unsigned long addr, int subbuf_size, unsigned int nr_subbufs) { addr += sizeof(struct ring_buffer_cpu_meta) + sizeof(int) * nr_subbufs; @@ -1679,13 +1679,13 @@ rb_range_align_subbuf(unsigned long addr, int subbuf_size, int nr_subbufs) /* * Return the ring_buffer_meta for a given @cpu. */ -static void *rb_range_meta(struct trace_buffer *buffer, int nr_pages, int cpu) +static void *rb_range_meta(struct trace_buffer *buffer, unsigned int nr_pages, int cpu) { int subbuf_size = rb_subbuf_size(buffer); struct ring_buffer_cpu_meta *meta; struct ring_buffer_meta *bmeta; + unsigned int nr_subbufs; unsigned long ptr; - int nr_subbufs; bmeta = buffer->meta; if (!bmeta) @@ -1840,7 +1840,7 @@ static bool rb_meta_init(struct trace_buffer *buffer, int scratch_size) * must be the same. */ static bool rb_cpu_meta_valid(struct ring_buffer_cpu_meta *meta, int cpu, - struct trace_buffer *buffer, int nr_pages, + struct trace_buffer *buffer, unsigned int nr_pages, unsigned long *subbuf_mask) { int subbuf_size = PAGE_SIZE; @@ -2231,7 +2231,7 @@ static void rb_meta_validate_events(struct ring_buffer_per_cpu *cpu_buffer) } } -static void rb_range_meta_init(struct trace_buffer *buffer, int nr_pages, int scratch_size) +static void rb_range_meta_init(struct trace_buffer *buffer, unsigned int nr_pages, int scratch_size) { struct ring_buffer_cpu_meta *meta; unsigned long *subbuf_mask; @@ -2331,8 +2331,8 @@ static int rbm_show(struct seq_file *m, void *v) rb_meta_subbuf_idx(meta, (void *)meta->head_buffer)); seq_printf(m, "commit_buffer: %d\n", rb_meta_subbuf_idx(meta, (void *)meta->commit_buffer)); - seq_printf(m, "subbuf_size: %d\n", meta->subbuf_size); - seq_printf(m, "nr_subbufs: %d\n", meta->nr_subbufs); + seq_printf(m, "subbuf_size: %u\n", meta->subbuf_size); + seq_printf(m, "nr_subbufs: %u\n", meta->nr_subbufs); return 0; } @@ -2417,7 +2417,7 @@ static void *ring_buffer_desc_page(struct ring_buffer_desc *desc, unsigned int p } static int __rb_allocate_pages(struct ring_buffer_per_cpu *cpu_buffer, - long nr_pages, struct list_head *pages) + unsigned int nr_pages, struct list_head *pages) { struct trace_buffer *buffer = cpu_buffer->buffer; struct ring_buffer_cpu_meta *meta = NULL; @@ -2520,7 +2520,7 @@ static int __rb_allocate_pages(struct ring_buffer_per_cpu *cpu_buffer, } static int rb_allocate_pages(struct ring_buffer_per_cpu *cpu_buffer, - unsigned long nr_pages) + unsigned int nr_pages) { LIST_HEAD(pages); @@ -2545,7 +2545,7 @@ static int rb_allocate_pages(struct ring_buffer_per_cpu *cpu_buffer, } static struct ring_buffer_per_cpu * -rb_allocate_cpu_buffer(struct trace_buffer *buffer, long nr_pages, int cpu) +rb_allocate_cpu_buffer(struct trace_buffer *buffer, unsigned int nr_pages, int cpu) { struct ring_buffer_per_cpu *cpu_buffer __free(kfree) = alloc_cpu_buffer(cpu); @@ -2773,7 +2773,7 @@ static struct trace_buffer *alloc_buffer(unsigned long size, unsigned flags, struct ring_buffer_remote *remote) { struct trace_buffer *buffer __free(kfree) = NULL; - long nr_pages; + unsigned int nr_pages; int subbuf_size; int bsize; int cpu; @@ -3037,12 +3037,12 @@ static inline unsigned long rb_page_write(struct buffer_page *bpage) } static bool -rb_remove_pages(struct ring_buffer_per_cpu *cpu_buffer, unsigned long nr_pages) +rb_remove_pages(struct ring_buffer_per_cpu *cpu_buffer, unsigned int nr_pages) { struct list_head *tail_page, *to_remove, *next_page; struct buffer_page *to_remove_page, *tmp_iter_page; struct buffer_page *last_page, *first_page; - unsigned long nr_removed; + unsigned int nr_removed; unsigned long head_bit; int page_entries; @@ -3264,7 +3264,7 @@ int ring_buffer_resize(struct trace_buffer *buffer, unsigned long size, int cpu_id) { struct ring_buffer_per_cpu *cpu_buffer; - unsigned long nr_pages; + unsigned int nr_pages; int cpu, err; /* @@ -6522,7 +6522,7 @@ unsigned long ring_buffer_size(struct trace_buffer *buffer, int cpu) if (!cpumask_test_cpu(cpu, buffer->cpumask)) return 0; - return rb_subbuf_capacity(buffer) * buffer->buffers[cpu]->nr_pages; + return (unsigned long)rb_subbuf_capacity(buffer) * buffer->buffers[cpu]->nr_pages; } EXPORT_SYMBOL_GPL(ring_buffer_size); @@ -7412,8 +7412,8 @@ int ring_buffer_subbuf_order_set(struct trace_buffer *buffer, int order) struct ring_buffer_per_cpu *cpu_buffer; struct buffer_page *bpage, *tmp; unsigned int old_capacity; + unsigned int nr_pages; int old_order; - int nr_pages; int psize; int err; int cpu; @@ -7459,8 +7459,9 @@ int ring_buffer_subbuf_order_set(struct trace_buffer *buffer, int order) } /* Update the number of pages to match the new size */ - nr_pages = old_capacity * buffer->buffers[cpu]->nr_pages; - nr_pages = DIV_ROUND_UP(nr_pages, rb_subbuf_capacity(buffer)); + nr_pages = DIV_ROUND_UP( + (unsigned long)old_capacity * buffer->buffers[cpu]->nr_pages, + rb_subbuf_capacity(buffer)); /* we need a minimum of two pages */ if (nr_pages < 2) @@ -7702,8 +7703,8 @@ static int __rb_inc_dec_mapped(struct ring_buffer_per_cpu *cpu_buffer, static int __rb_map_vma(struct ring_buffer_per_cpu *cpu_buffer, struct vm_area_struct *vma) { - unsigned long nr_subbufs, nr_pages, nr_vma_pages, pgoff = vma->vm_pgoff; - unsigned int subbuf_pages, subbuf_order; + unsigned long nr_pages, nr_vma_pages, pgoff = vma->vm_pgoff; + unsigned int nr_subbufs, subbuf_pages, subbuf_order; struct page **pages __free(kfree) = NULL; int p = 0, s = 0; int err; @@ -8033,9 +8034,9 @@ static void rb_cpu_sync(void *data) int trace_rb_cpu_prepare(unsigned int cpu, struct hlist_node *node) { struct trace_buffer *buffer; - long nr_pages_same; + unsigned int nr_pages; + int nr_pages_same; int cpu_i; - unsigned long nr_pages; buffer = container_of(node, struct trace_buffer, node); if (cpumask_test_cpu(cpu, buffer->cpumask)) -- 2.55.0.691.gc56d675ccc-goog