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Tue, 13 Jan 2026 07:22:47 -0800 (PST) Sender: Guenter Roeck From: Guenter Roeck To: Steven Rostedt Cc: Masami Hiramatsu , Mark Rutland , Mathieu Desnoyers , linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, Guenter Roeck Subject: [PATCH v4 2/2] ftrace: Introduce and use ENTRIES_PER_PAGE_GROUP macro Date: Tue, 13 Jan 2026 07:22:43 -0800 Message-ID: <20260113152243.3557219-2-linux@roeck-us.net> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20260113152243.3557219-1-linux@roeck-us.net> References: <20260113152243.3557219-1-linux@roeck-us.net> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit ENTRIES_PER_PAGE_GROUP() returns the number of dyn_ftrace entries in a page group, identified by its order. No functional change. Signed-off-by: Guenter Roeck --- v4: New patch, optional. Squash, drop, or apply as separate patch. kernel/trace/ftrace.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c index aa758efc3731..df4ce244202e 100644 --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -1148,6 +1148,7 @@ struct ftrace_page { }; #define ENTRY_SIZE sizeof(struct dyn_ftrace) +#define ENTRIES_PER_PAGE_GROUP(order) ((PAGE_SIZE << (order)) / ENTRY_SIZE) static struct ftrace_page *ftrace_pages_start; static struct ftrace_page *ftrace_pages; @@ -3862,7 +3863,7 @@ static int ftrace_allocate_records(struct ftrace_page *pg, int count, *num_pages += 1 << order; ftrace_number_of_groups++; - cnt = (PAGE_SIZE << order) / ENTRY_SIZE; + cnt = ENTRIES_PER_PAGE_GROUP(order); pg->order = order; if (cnt > count) @@ -7309,7 +7310,7 @@ static int ftrace_process_locs(struct module *mod, long skip; /* Count the number of entries unused and compare it to skipped. */ - pg_remaining = (PAGE_SIZE << pg->order) / ENTRY_SIZE - pg->index; + pg_remaining = ENTRIES_PER_PAGE_GROUP(pg->order) - pg->index; if (!WARN(skipped < pg_remaining, "Extra allocated pages for ftrace")) { @@ -7317,7 +7318,7 @@ static int ftrace_process_locs(struct module *mod, for (pg = pg_unuse; pg && skip > 0; pg = pg->next) { remaining += 1 << pg->order; - skip -= (PAGE_SIZE << pg->order) / ENTRY_SIZE; + skip -= ENTRIES_PER_PAGE_GROUP(pg->order); } pages -= remaining; -- 2.45.2