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[209.132.180.67]) by mx.google.com with ESMTP id t190si48963167pgd.465.2019.08.07.15.28.47; Wed, 07 Aug 2019 15:29:03 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389558AbfHGW1k (ORCPT + 99 others); Wed, 7 Aug 2019 18:27:40 -0400 Received: from Galois.linutronix.de ([193.142.43.55]:51831 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388848AbfHGW1h (ORCPT ); Wed, 7 Aug 2019 18:27:37 -0400 Received: from [5.158.153.52] (helo=g2noscherz.tec.linutronix.de.) by Galois.linutronix.de with esmtpsa (TLS1.2:DHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.80) (envelope-from ) id 1hvUOs-0007mg-0e; Thu, 08 Aug 2019 00:27:20 +0200 From: John Ogness To: linux-kernel@vger.kernel.org Cc: Peter Zijlstra , Petr Mladek , Sergey Senozhatsky , Steven Rostedt , Linus Torvalds , Greg Kroah-Hartman , Andrea Parri , Thomas Gleixner , Sergey Senozhatsky , Brendan Higgins Subject: [RFC PATCH v4 7/9] printk-rb: increase size of seq and size variables Date: Thu, 8 Aug 2019 00:32:32 +0206 Message-Id: <20190807222634.1723-8-john.ogness@linutronix.de> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190807222634.1723-1-john.ogness@linutronix.de> References: <20190807222634.1723-1-john.ogness@linutronix.de> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The printk implementation will rely on sequence numbers never wrapping. For 32-bit systems, an unsigned long for sequence numbers is not acceptable. Change the sequence number to u64. Size variables are currently unsigned int, which may not be acceptable for 64-bit systems. Change size variables to unsigned long. (32-bit sizes on 32-bit systems should be fine.) Signed-off-by: John Ogness --- kernel/printk/dataring.c | 8 ++++---- kernel/printk/dataring.h | 4 ++-- kernel/printk/numlist.c | 6 +++--- kernel/printk/numlist.h | 6 +++--- kernel/printk/ringbuffer.c | 6 +++--- kernel/printk/ringbuffer.h | 10 +++++----- kernel/printk/test_prb.c | 14 +++++++------- 7 files changed, 27 insertions(+), 27 deletions(-) diff --git a/kernel/printk/dataring.c b/kernel/printk/dataring.c index 345c46dba5bb..712842f2dc04 100644 --- a/kernel/printk/dataring.c +++ b/kernel/printk/dataring.c @@ -152,7 +152,7 @@ static struct dr_datablock *to_datablock(struct dataring *dr, * than or equal to the size of @dr_datablock.id. This ensures that there is * always space in the data array for the @id of a "wrapping" data block. */ -static void to_db_size(unsigned int *size) +static void to_db_size(unsigned long *size) { *size += sizeof(struct dr_datablock); /* Alignment padding must be >= sizeof(dr_datablock.id). */ @@ -238,7 +238,7 @@ bool dataring_datablock_isvalid(struct dataring *dr, struct dr_desc *desc) * * Return: true if the size is legal for the data ringbuffer, otherwise false. */ -bool dataring_checksize(struct dataring *dr, unsigned int size) +bool dataring_checksize(struct dataring *dr, unsigned long size) { if (size == 0) return false; @@ -445,7 +445,7 @@ static unsigned long _dataring_pop(struct dataring *dr, * This will only fail if it was not possible to invalidate the tail data * block (i.e. the @id of the tail data block was not yet set by its writer). */ -static bool get_new_lpos(struct dataring *dr, unsigned int size, +static bool get_new_lpos(struct dataring *dr, unsigned long size, unsigned long *begin_lpos_out, unsigned long *next_lpos_out) { @@ -537,7 +537,7 @@ void dataring_desc_init(struct dr_desc *desc) * This will only fail if it was not possible to invalidate the tail data * block. */ -char *dataring_push(struct dataring *dr, unsigned int size, +char *dataring_push(struct dataring *dr, unsigned long size, struct dr_desc *desc, unsigned long id) { unsigned long begin_lpos; diff --git a/kernel/printk/dataring.h b/kernel/printk/dataring.h index 413ee95f4dd6..c566ce228abe 100644 --- a/kernel/printk/dataring.h +++ b/kernel/printk/dataring.h @@ -90,10 +90,10 @@ struct dataring { void *getdesc_arg; }; -bool dataring_checksize(struct dataring *dr, unsigned int size); +bool dataring_checksize(struct dataring *dr, unsigned long size); bool dataring_pop(struct dataring *dr); -char *dataring_push(struct dataring *dr, unsigned int size, +char *dataring_push(struct dataring *dr, unsigned long size, struct dr_desc *desc, unsigned long id); void dataring_datablock_setid(struct dataring *dr, struct dr_desc *desc, diff --git a/kernel/printk/numlist.c b/kernel/printk/numlist.c index d5e224dafc0c..16c6ffa74b01 100644 --- a/kernel/printk/numlist.c +++ b/kernel/printk/numlist.c @@ -108,7 +108,7 @@ * * This function will fail if @id is not valid anytime during this function. */ -bool numlist_read(struct numlist *nl, unsigned long id, unsigned long *seq, +bool numlist_read(struct numlist *nl, unsigned long id, u64 *seq, unsigned long *next_id) { struct nl_node *n; @@ -165,7 +165,7 @@ bool numlist_read(struct numlist *nl, unsigned long id, unsigned long *seq, * * Return: The ID of the tail node. */ -unsigned long numlist_read_tail(struct numlist *nl, unsigned long *seq, +unsigned long numlist_read_tail(struct numlist *nl, u64 *seq, unsigned long *next_id) { unsigned long tail_id; @@ -201,8 +201,8 @@ unsigned long numlist_read_tail(struct numlist *nl, unsigned long *seq, void numlist_push(struct numlist *nl, struct nl_node *n, unsigned long id) { unsigned long head_id; - unsigned long seq; unsigned long r; + u64 seq; /* * bA: diff --git a/kernel/printk/numlist.h b/kernel/printk/numlist.h index cdc3b21e6597..d4595fb9a3e9 100644 --- a/kernel/printk/numlist.h +++ b/kernel/printk/numlist.h @@ -20,7 +20,7 @@ */ struct nl_node { /* private */ - unsigned long seq; + u64 seq; unsigned long next_id; }; @@ -64,9 +64,9 @@ struct numlist { void numlist_push(struct numlist *nl, struct nl_node *n, unsigned long id); struct nl_node *numlist_pop(struct numlist *nl); -unsigned long numlist_read_tail(struct numlist *nl, unsigned long *seq, +unsigned long numlist_read_tail(struct numlist *nl, u64 *seq, unsigned long *next_id); -bool numlist_read(struct numlist *nl, unsigned long id, unsigned long *seq, +bool numlist_read(struct numlist *nl, unsigned long id, u64 *seq, unsigned long *next_id); #endif /* _KERNEL_PRINTK_NUMLIST_H */ diff --git a/kernel/printk/ringbuffer.c b/kernel/printk/ringbuffer.c index 9be841761ea2..053622151447 100644 --- a/kernel/printk/ringbuffer.c +++ b/kernel/printk/ringbuffer.c @@ -416,7 +416,7 @@ static bool assign_desc(struct prb_reserved_entry *e) * * -ENOMEM: failed to reserve data (invalid descriptor committed) */ char *prb_reserve(struct prb_reserved_entry *e, struct printk_ringbuffer *rb, - unsigned int size) + unsigned long size) { struct prb_desc *d; unsigned long id; @@ -567,7 +567,7 @@ EXPORT_SYMBOL(prb_iter_init); */ static void reset_iter(struct prb_iterator *iter) { - unsigned long last_seq; + u64 last_seq; iter->next_id = numlist_read_tail(&iter->rb->nl, &last_seq, NULL); @@ -650,9 +650,9 @@ int prb_iter_next_valid_entry(struct prb_iterator *iter) struct dr_desc desc; struct prb_desc *d; struct nl_node *n; - unsigned long seq; unsigned long id; int size; + u64 seq; if (!setup_next(nl, iter)) return 0; diff --git a/kernel/printk/ringbuffer.h b/kernel/printk/ringbuffer.h index 698d2328ea9e..ec7bb21abac2 100644 --- a/kernel/printk/ringbuffer.h +++ b/kernel/printk/ringbuffer.h @@ -97,9 +97,9 @@ struct prb_reserved_entry { */ struct prb_entry { /* public */ - unsigned long seq; - char *buffer; - int buffer_size; + u64 seq; + char *buffer; + int buffer_size; }; /** @@ -125,13 +125,13 @@ struct prb_iterator { struct prb_entry *e; unsigned long last_id; - unsigned long last_seq; + u64 last_seq; unsigned long next_id; }; /* writer interface */ char *prb_reserve(struct prb_reserved_entry *e, struct printk_ringbuffer *rb, - unsigned int size); + unsigned long size); void prb_commit(struct prb_reserved_entry *e); /* reader interface */ diff --git a/kernel/printk/test_prb.c b/kernel/printk/test_prb.c index 77d298b6990a..0157bbdf051f 100644 --- a/kernel/printk/test_prb.c +++ b/kernel/printk/test_prb.c @@ -38,8 +38,8 @@ static void dump_rb(struct printk_ringbuffer *rb) { DECLARE_PRINTKRB_ENTRY(entry, 160); DECLARE_PRINTKRB_ITER(iter, rb, &entry); - unsigned long last_seq = 0; struct rbdata *dat; + u64 last_seq = 0; char buf[160]; int len; @@ -47,7 +47,7 @@ static void dump_rb(struct printk_ringbuffer *rb) prb_for_each_entry_continue(&iter, len) { if (entry.seq - last_seq != 1) { - trace_printk("LOST %lu\n", + trace_printk("LOST %llu\n", entry.seq - (last_seq + 1)); } last_seq = entry.seq; @@ -56,7 +56,7 @@ static void dump_rb(struct printk_ringbuffer *rb) snprintf(buf, sizeof(buf), "%s", dat->text); buf[sizeof(buf) - 1] = 0; - trace_printk("seq=%lu len=%d textlen=%d dataval=%s\n", + trace_printk("seq=%llu len=%d textlen=%d dataval=%s\n", entry.seq, len, dat->len, buf); } @@ -112,11 +112,11 @@ static int prbtest_reader(void *data) DECLARE_PRINTKRB_ENTRY(entry, 160); DECLARE_PRINTKRB_ITER(iter, &test_rb, &entry); unsigned long total_lost = 0; - unsigned long last_seq = 0; unsigned long max_lost = 0; unsigned long count = 0; struct rbdata *dat; int did_sched = 1; + u64 last_seq = 0; int len; pr_err("prbtest: start thread %lu (reader)\n", num); @@ -126,7 +126,7 @@ static int prbtest_reader(void *data) if (entry.seq < last_seq) { WRITE_ONCE(halt_test, 1); trace_printk( - "reader%lu invalid seq %lu -> %lu\n", + "reader%lu invalid seq %llu -> %llu\n", num, last_seq, entry.seq); goto out; } @@ -145,7 +145,7 @@ static int prbtest_reader(void *data) if (len != dat->len || len >= 160) { WRITE_ONCE(halt_test, 1); trace_printk( - "reader%lu invalid len for %lu (%d<->%d)\n", + "reader%lu invalid len for %llu (%d<->%d)\n", num, entry.seq, len, dat->len); goto out; } @@ -172,7 +172,7 @@ static int prbtest_reader(void *data) } out: pr_err( - "reader%lu: total_lost=%lu max_lost=%lu total_read=%lu seq=%lu\n", + "reader%lu: total_lost=%lu max_lost=%lu total_read=%lu seq=%llu\n", num, total_lost, max_lost, count, entry.seq); pr_err("prbtest: end thread %lu (reader)\n", num); -- 2.20.1