From patchwork Fri Feb 23 20:22:06 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Steven Rostedt X-Patchwork-Id: 13569937 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2BD4F149388; Fri, 23 Feb 2024 20:20:14 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708719615; cv=none; b=tkZHEv/Ye0qeQhlSSltcQIn6dv+/z3BqdAVbhvSlgC5CtQYE06+3AMDtPef4lrQaASW3KNcc4nLnV/MSkRb7XGeTwf4TpGwg9QJZt4iY3FxF/CK+GQ2o45mk4BHkxoNR3fZZNvKmH9LfYw4HOfJ+PQOpqkTAIjMAOuN/IkolzZc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708719615; c=relaxed/simple; bh=CQv9OjZaC8cVr5dQoVkV3H1UwbxVlvPPTLLBhbu5mHI=; h=Date:From:To:Cc:Subject:Message-ID:MIME-Version:Content-Type; b=MNXhqcU5JbAwDymAm9qUSOZ7/OC3PywhC56aG0dTmkPrQuyIPfHklHPP4Kc8smbszkCwEFkjkBzab3/33vYsjdVO6km7e4Akfb/sGWp8mEoRsGVFC3MZcc+IYtta1YW50Ci1kmHcbxnUa8Ax8P5d+/Pi0LXvugnjrGJxDj3QuXc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 Received: by smtp.kernel.org (Postfix) with ESMTPSA id D1DCDC433F1; Fri, 23 Feb 2024 20:20:13 +0000 (UTC) Date: Fri, 23 Feb 2024 15:22:06 -0500 From: Steven Rostedt To: LKML , Linux Trace Kernel Cc: linux-nfs@vger.kernel.org, Chuck Lever , Jeff Layton Subject: [PATCH v2] tracing: Remove __assign_str_len() Message-ID: <20240223152206.0b650659@gandalf.local.home> X-Mailer: Claws Mail 3.19.1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: "Steven Rostedt (Google)" Now that __assign_str() gets the length from the __string() (and __string_len()) macros, there's no reason to have a separate __assign_str_len() macro as __assign_str() can get the length of the string needed. Also remove __assign_rel_str() although it had no users anyway. Signed-off-by: Steven Rostedt (Google) --- Changes since v2: https://lore.kernel.org/linux-trace-kernel/20240223144840.563660e1@gandalf.local.home/ - I just realized that __assign_str_len() makes sure that the string ends with a '\0'. To use __assign_str(), it too must write a '\0' at the end of the string. fs/nfsd/trace.h | 8 +++--- include/trace/stages/stage6_event_callback.h | 28 ++++++++------------ samples/trace_events/trace-events-sample.h | 9 ++++--- 3 files changed, 20 insertions(+), 25 deletions(-) diff --git a/fs/nfsd/trace.h b/fs/nfsd/trace.h index 2cd57033791f..98b14f30d772 100644 --- a/fs/nfsd/trace.h +++ b/fs/nfsd/trace.h @@ -102,7 +102,7 @@ TRACE_EVENT(nfsd_compound, TP_fast_assign( __entry->xid = be32_to_cpu(rqst->rq_xid); __entry->opcnt = opcnt; - __assign_str_len(tag, tag, taglen); + __assign_str(tag, tag); ), TP_printk("xid=0x%08x opcnt=%u tag=%s", __entry->xid, __entry->opcnt, __get_str(tag) @@ -483,7 +483,7 @@ TRACE_EVENT(nfsd_dirent, TP_fast_assign( __entry->fh_hash = fhp ? knfsd_fh_hash(&fhp->fh_handle) : 0; __entry->ino = ino; - __assign_str_len(name, name, namlen) + __assign_str(name, name); ), TP_printk("fh_hash=0x%08x ino=%llu name=%s", __entry->fh_hash, __entry->ino, __get_str(name) @@ -853,7 +853,7 @@ DECLARE_EVENT_CLASS(nfsd_clid_class, __entry->flavor = clp->cl_cred.cr_flavor; memcpy(__entry->verifier, (void *)&clp->cl_verifier, NFS4_VERIFIER_SIZE); - __assign_str_len(name, clp->cl_name.data, clp->cl_name.len); + __assign_str(name, clp->cl_name.data); ), TP_printk("addr=%pISpc name='%s' verifier=0x%s flavor=%s client=%08x:%08x", __entry->addr, __get_str(name), @@ -1800,7 +1800,7 @@ TRACE_EVENT(nfsd_ctl_time, TP_fast_assign( __entry->netns_ino = net->ns.inum; __entry->time = time; - __assign_str_len(name, name, namelen); + __assign_str(name, name); ), TP_printk("file=%s time=%d\n", __get_str(name), __entry->time diff --git a/include/trace/stages/stage6_event_callback.h b/include/trace/stages/stage6_event_callback.h index 2bfd49713b42..0c0f50bcdc56 100644 --- a/include/trace/stages/stage6_event_callback.h +++ b/include/trace/stages/stage6_event_callback.h @@ -32,16 +32,13 @@ #undef __assign_str #define __assign_str(dst, src) \ - memcpy(__get_str(dst), __data_offsets.dst##_ptr_ ? : EVENT_NULL_STR, \ - __get_dynamic_array_len(dst)) - -#undef __assign_str_len -#define __assign_str_len(dst, src, len) \ do { \ - memcpy(__get_str(dst), \ - __data_offsets.dst##_ptr_ ? : EVENT_NULL_STR, len); \ - __get_str(dst)[len] = '\0'; \ - } while(0) + char *__str__ = __get_str(dst); \ + int __len__ = __get_dynamic_array_len(dst) - 1; \ + memcpy(__str__, __data_offsets.dst##_ptr_ ? : \ + EVENT_NULL_STR, __len__); \ + __str__[__len__] = '\0'; \ + } while (0) #undef __assign_vstr #define __assign_vstr(dst, fmt, va) \ @@ -94,15 +91,12 @@ #undef __assign_rel_str #define __assign_rel_str(dst, src) \ - memcpy(__get_rel_str(dst), __data_offsets.dst##_ptr_ ? : EVENT_NULL_STR, \ - __get_rel_dynamic_array_len(dst)) - -#undef __assign_rel_str_len -#define __assign_rel_str_len(dst, src, len) \ do { \ - memcpy(__get_rel_str(dst), \ - __data_offsets.dst##_ptr_ ? : EVENT_NULL_STR, len); \ - __get_rel_str(dst)[len] = '\0'; \ + char *__str__ = __get_rel_str(dst); \ + int __len__ = __get_rel_dynamic_array_len(dst) - 1; \ + memcpy(__str__, __data_offsets.dst##_ptr_ ? : \ + EVENT_NULL_STR, __len__); \ + __str__[__len__] = '\0'; \ } while (0) #undef __rel_bitmask diff --git a/samples/trace_events/trace-events-sample.h b/samples/trace_events/trace-events-sample.h index 23f923ccd529..f2d2d56ce8e2 100644 --- a/samples/trace_events/trace-events-sample.h +++ b/samples/trace_events/trace-events-sample.h @@ -163,8 +163,7 @@ * __string(). * * __string_len: This is a helper to a __dynamic_array, but it understands - * that the array has characters in it, and with the combined - * use of __assign_str_len(), it will allocate 'len' + 1 bytes + * that the array has characters in it, it will allocate 'len' + 1 bytes * in the ring buffer and add a '\0' to the string. This is * useful if the string being saved has no terminating '\0' byte. * It requires that the length of the string is known as it acts @@ -174,9 +173,11 @@ * * __string_len(foo, bar, len) * - * To assign this string, use the helper macro __assign_str_len(). + * To assign this string, use the helper macro __assign_str(). + * The length is saved via the __string_len() and is retrieved in + * __assign_str(). * - * __assign_str_len(foo, bar, len); + * __assign_str(foo, bar); * * Then len + 1 is allocated to the ring buffer, and a nul terminating * byte is added. This is similar to: