From nobody Sat Feb 7 14:22:33 2026 Received: from mail-ej1-f74.google.com (mail-ej1-f74.google.com [209.85.218.74]) (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 27851231C9C for ; Wed, 16 Apr 2025 08:55:00 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.218.74 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744793703; cv=none; b=C4FVDdSPr41xKNLxYnTHRPVVfEWzrACpIhWJ7WuYXg/VI7Q6sK/PIfYS1x8lHPF5iwbUlM2FS7fTIlbYOupbYfRHY9+Mn9Yakmf7Uah7Y8D09fc3bDgbcoJldF8a0ywmIri4nEzV6rVb1/9sdIgwm6zT4Yf/IrkSTmcgn7rEDQw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744793703; c=relaxed/simple; bh=KtYa9ptAIenoFcZebd/OoA0MHCY7YUeNZ+OuOJPwff0=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=Bw0jJMMN4/4hvXk9ojmaf4+FPg3sP+mw5Fwym13mPMwwu4FpG2jatVkuxX7OJFgr9TQIRb4tIi6yCoXJkpNbGiZXmDF0BGUmf9Ur1mc5b3C5e3oAp8p6P3OSqTmfHK80UukmY4GWZwZNtAAzS4P+lmz+eam5FHES9Qu7Sk2+qq8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--glider.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=OBVlE+B5; arc=none smtp.client-ip=209.85.218.74 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--glider.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="OBVlE+B5" Received: by mail-ej1-f74.google.com with SMTP id a640c23a62f3a-ab39f65dc10so76233866b.1 for ; Wed, 16 Apr 2025 01:55:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1744793699; x=1745398499; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=fawUJ+aFly0mZ/Doql3hbHEHCvseg6enUQu7sHu+ODc=; b=OBVlE+B5qfRvp6Rqu/5dKCjCJ3FixmFs1IcU9XnvDony1VCP0IPFuxe9KU4LcaYOON S2dCCTAvyEH0SU11uyXVhSsLp+RxbHnLPkYBCuBnrS9wCRvZebZo5bhaaNppxq1hFPJY W622invc3iYWT3tyRyLrbRl6EASjrDglBINDn1xPgx24WVcCJxqZ1HZysmecJEXAT26/ 7OWFlzlP7u+v+f9DrrgGEkohvkja5yalSXwMciURwD0mr9AZxNQJNgpy5O11qXR7EYHs lSZCfFoubYRMxHzibrcucvYClraQZbljeahE/Bk5YJqavUJQjpSW/tvk54BJg9bq70YP Q0Og== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1744793699; x=1745398499; h=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; bh=fawUJ+aFly0mZ/Doql3hbHEHCvseg6enUQu7sHu+ODc=; b=o1sI4JKxl6GTL/0y8LzxK+5S7Ha0VmLP/F86vkbQjBxExvCj67VdT2ylA45/ofHpX1 PzwoJub/M90iHmQEj+oaHOTJteei+Hx0NsrldFU5bHQafQk3RwO420HrOTiwXTfXNM2Q uGRhzfsjOzEUFtfm4pb8AlEfM/SHDu6BFLu4wagkh+g0TtferQD80D15KQyieLZjTG4q dFpBN6JQ7b8LS6PeFIlzWS3pkufk2Q8p+6Razrhr3QBmK9QjW13/eG4vXOd+35gZ/4BA tDsEEr+9ys/hyhvwEp912hUAwdXAUZiWaQna5fJOl4mYKaAXDg/IxkiBrPtCxvuhbP3I KD5g== X-Forwarded-Encrypted: i=1; AJvYcCUPlachGQ0LdbxvxSvt8lDVnySRncvI9ByNcPkNOnYIU8eZKQc3a3N7FMZ1XMOzB0TW6zr5dwOwYbYanIM=@vger.kernel.org X-Gm-Message-State: AOJu0YzfNmdVBwI/ECRdQaBBWu+Uh93+Kn0tEd6PkbkFTp/om35lH3K4 jyrtpzROMmDpGv1y2ZJoJumhW5xDVHJdom1vlDRDgX9B0TbE1cErPUIPkxguIJbBxcScAtwmE5I 47w== X-Google-Smtp-Source: AGHT+IFMpHxojJPc6OHaoIu0fIr+RlbRszpzoKA4cMK2zk+nFPapDuFTHF6A9VyK9BuvqoeWKMYRbb/SAa8= X-Received: from ejaz16.prod.google.com ([2002:a17:906:2410:b0:ac2:ea20:40ac]) (user=glider job=prod-delivery.src-stubby-dispatcher) by 2002:a17:907:d2a:b0:ac7:efed:3ab with SMTP id a640c23a62f3a-acb429e5b2amr87507766b.21.1744793699499; Wed, 16 Apr 2025 01:54:59 -0700 (PDT) Date: Wed, 16 Apr 2025 10:54:39 +0200 In-Reply-To: <20250416085446.480069-1-glider@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20250416085446.480069-1-glider@google.com> X-Mailer: git-send-email 2.49.0.604.gff1f9ca942-goog Message-ID: <20250416085446.480069-2-glider@google.com> Subject: [PATCH 1/7] kcov: apply clang-format to kcov code From: Alexander Potapenko To: glider@google.com Cc: quic_jiangenj@quicinc.com, linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com, Aleksandr Nogikh , Andrey Konovalov , Borislav Petkov , Dave Hansen , Dmitry Vyukov , Ingo Molnar , Josh Poimboeuf , Marco Elver , Peter Zijlstra , Thomas Gleixner Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" kcov used to obey clang-format style, but somehow diverged over time. This patch applies clang-format to kernel/kcov.c and include/linux/kcov.h, no functional change. Signed-off-by: Alexander Potapenko --- include/linux/kcov.h | 54 +++++++++++------ kernel/kcov.c | 134 ++++++++++++++++++++++--------------------- 2 files changed, 105 insertions(+), 83 deletions(-) diff --git a/include/linux/kcov.h b/include/linux/kcov.h index 75a2fb8b16c32..932b4face1005 100644 --- a/include/linux/kcov.h +++ b/include/linux/kcov.h @@ -25,20 +25,20 @@ enum kcov_mode { KCOV_MODE_REMOTE =3D 4, }; =20 -#define KCOV_IN_CTXSW (1 << 30) +#define KCOV_IN_CTXSW (1 << 30) =20 void kcov_task_init(struct task_struct *t); void kcov_task_exit(struct task_struct *t); =20 -#define kcov_prepare_switch(t) \ -do { \ - (t)->kcov_mode |=3D KCOV_IN_CTXSW; \ -} while (0) +#define kcov_prepare_switch(t) \ + do { \ + (t)->kcov_mode |=3D KCOV_IN_CTXSW; \ + } while (0) =20 -#define kcov_finish_switch(t) \ -do { \ - (t)->kcov_mode &=3D ~KCOV_IN_CTXSW; \ -} while (0) +#define kcov_finish_switch(t) \ + do { \ + (t)->kcov_mode &=3D ~KCOV_IN_CTXSW; \ + } while (0) =20 /* See Documentation/dev-tools/kcov.rst for usage details. */ void kcov_remote_start(u64 handle); @@ -119,23 +119,41 @@ void __sanitizer_cov_trace_switch(kcov_u64 val, void = *cases); =20 #else =20 -static inline void kcov_task_init(struct task_struct *t) {} -static inline void kcov_task_exit(struct task_struct *t) {} -static inline void kcov_prepare_switch(struct task_struct *t) {} -static inline void kcov_finish_switch(struct task_struct *t) {} -static inline void kcov_remote_start(u64 handle) {} -static inline void kcov_remote_stop(void) {} +static inline void kcov_task_init(struct task_struct *t) +{ +} +static inline void kcov_task_exit(struct task_struct *t) +{ +} +static inline void kcov_prepare_switch(struct task_struct *t) +{ +} +static inline void kcov_finish_switch(struct task_struct *t) +{ +} +static inline void kcov_remote_start(u64 handle) +{ +} +static inline void kcov_remote_stop(void) +{ +} static inline u64 kcov_common_handle(void) { return 0; } -static inline void kcov_remote_start_common(u64 id) {} -static inline void kcov_remote_start_usb(u64 id) {} +static inline void kcov_remote_start_common(u64 id) +{ +} +static inline void kcov_remote_start_usb(u64 id) +{ +} static inline unsigned long kcov_remote_start_usb_softirq(u64 id) { return 0; } -static inline void kcov_remote_stop_softirq(unsigned long flags) {} +static inline void kcov_remote_stop_softirq(unsigned long flags) +{ +} =20 #endif /* CONFIG_KCOV */ #endif /* _LINUX_KCOV_H */ diff --git a/kernel/kcov.c b/kernel/kcov.c index 187ba1b80bda1..7cc6123c2baa4 100644 --- a/kernel/kcov.c +++ b/kernel/kcov.c @@ -4,27 +4,28 @@ #define DISABLE_BRANCH_PROFILING #include #include +#include #include #include -#include #include #include #include #include #include +#include #include +#include #include #include #include +#include #include #include #include -#include -#include +#include #include -#include -#include -#include +#include + #include =20 #define kcov_debug(fmt, ...) pr_debug("%s: " fmt, __func__, ##__VA_ARGS__) @@ -52,36 +53,36 @@ struct kcov { * - task with enabled coverage (we can't unwire it from another task) * - each code section for remote coverage collection */ - refcount_t refcount; + refcount_t refcount; /* The lock protects mode, size, area and t. */ - spinlock_t lock; - enum kcov_mode mode; + spinlock_t lock; + enum kcov_mode mode; /* Size of arena (in long's). */ - unsigned int size; + unsigned int size; /* Coverage buffer shared with user space. */ - void *area; + void *area; /* Task for which we collect coverage, or NULL. */ - struct task_struct *t; + struct task_struct *t; /* Collecting coverage from remote (background) threads. */ - bool remote; + bool remote; /* Size of remote area (in long's). */ - unsigned int remote_size; + unsigned int remote_size; /* * Sequence is incremented each time kcov is reenabled, used by * kcov_remote_stop(), see the comment there. */ - int sequence; + int sequence; }; =20 struct kcov_remote_area { - struct list_head list; - unsigned int size; + struct list_head list; + unsigned int size; }; =20 struct kcov_remote { - u64 handle; - struct kcov *kcov; - struct hlist_node hnode; + u64 handle; + struct kcov *kcov; + struct hlist_node hnode; }; =20 static DEFINE_SPINLOCK(kcov_remote_lock); @@ -89,14 +90,14 @@ static DEFINE_HASHTABLE(kcov_remote_map, 4); static struct list_head kcov_remote_areas =3D LIST_HEAD_INIT(kcov_remote_a= reas); =20 struct kcov_percpu_data { - void *irq_area; - local_lock_t lock; - - unsigned int saved_mode; - unsigned int saved_size; - void *saved_area; - struct kcov *saved_kcov; - int saved_sequence; + void *irq_area; + local_lock_t lock; + + unsigned int saved_mode; + unsigned int saved_size; + void *saved_area; + struct kcov *saved_kcov; + int saved_sequence; }; =20 static DEFINE_PER_CPU(struct kcov_percpu_data, kcov_percpu_data) =3D { @@ -149,7 +150,7 @@ static struct kcov_remote_area *kcov_remote_area_get(un= signed int size) =20 /* Must be called with kcov_remote_lock locked. */ static void kcov_remote_area_put(struct kcov_remote_area *area, - unsigned int size) + unsigned int size) { INIT_LIST_HEAD(&area->list); area->size =3D size; @@ -171,7 +172,8 @@ static __always_inline bool in_softirq_really(void) return in_serving_softirq() && !in_hardirq() && !in_nmi(); } =20 -static notrace bool check_kcov_mode(enum kcov_mode needed_mode, struct tas= k_struct *t) +static notrace bool check_kcov_mode(enum kcov_mode needed_mode, + struct task_struct *t) { unsigned int mode; =20 @@ -354,8 +356,8 @@ EXPORT_SYMBOL(__sanitizer_cov_trace_switch); #endif /* ifdef CONFIG_KCOV_ENABLE_COMPARISONS */ =20 static void kcov_start(struct task_struct *t, struct kcov *kcov, - unsigned int size, void *area, enum kcov_mode mode, - int sequence) + unsigned int size, void *area, enum kcov_mode mode, + int sequence) { kcov_debug("t =3D %px, size =3D %u, area =3D %px\n", t, size, area); t->kcov =3D kcov; @@ -566,14 +568,14 @@ static void kcov_fault_in_area(struct kcov *kcov) } =20 static inline bool kcov_check_handle(u64 handle, bool common_valid, - bool uncommon_valid, bool zero_valid) + bool uncommon_valid, bool zero_valid) { if (handle & ~(KCOV_SUBSYSTEM_MASK | KCOV_INSTANCE_MASK)) return false; switch (handle & KCOV_SUBSYSTEM_MASK) { case KCOV_SUBSYSTEM_COMMON: - return (handle & KCOV_INSTANCE_MASK) ? - common_valid : zero_valid; + return (handle & KCOV_INSTANCE_MASK) ? common_valid : + zero_valid; case KCOV_SUBSYSTEM_USB: return uncommon_valid; default: @@ -611,7 +613,7 @@ static int kcov_ioctl_locked(struct kcov *kcov, unsigne= d int cmd, kcov_fault_in_area(kcov); kcov->mode =3D mode; kcov_start(t, kcov, kcov->size, kcov->area, kcov->mode, - kcov->sequence); + kcov->sequence); kcov->t =3D t; /* Put either in kcov_task_exit() or in KCOV_DISABLE. */ kcov_get(kcov); @@ -642,40 +644,40 @@ static int kcov_ioctl_locked(struct kcov *kcov, unsig= ned int cmd, return -EINVAL; kcov->mode =3D mode; t->kcov =3D kcov; - t->kcov_mode =3D KCOV_MODE_REMOTE; + t->kcov_mode =3D KCOV_MODE_REMOTE; kcov->t =3D t; kcov->remote =3D true; kcov->remote_size =3D remote_arg->area_size; spin_lock_irqsave(&kcov_remote_lock, flags); for (i =3D 0; i < remote_arg->num_handles; i++) { - if (!kcov_check_handle(remote_arg->handles[i], - false, true, false)) { + if (!kcov_check_handle(remote_arg->handles[i], false, + true, false)) { spin_unlock_irqrestore(&kcov_remote_lock, - flags); + flags); kcov_disable(t, kcov); return -EINVAL; } remote =3D kcov_remote_add(kcov, remote_arg->handles[i]); if (IS_ERR(remote)) { spin_unlock_irqrestore(&kcov_remote_lock, - flags); + flags); kcov_disable(t, kcov); return PTR_ERR(remote); } } if (remote_arg->common_handle) { - if (!kcov_check_handle(remote_arg->common_handle, - true, false, false)) { + if (!kcov_check_handle(remote_arg->common_handle, true, + false, false)) { spin_unlock_irqrestore(&kcov_remote_lock, - flags); + flags); kcov_disable(t, kcov); return -EINVAL; } remote =3D kcov_remote_add(kcov, - remote_arg->common_handle); + remote_arg->common_handle); if (IS_ERR(remote)) { spin_unlock_irqrestore(&kcov_remote_lock, - flags); + flags); kcov_disable(t, kcov); return PTR_ERR(remote); } @@ -728,13 +730,15 @@ static long kcov_ioctl(struct file *filep, unsigned i= nt cmd, unsigned long arg) spin_unlock_irqrestore(&kcov->lock, flags); return 0; case KCOV_REMOTE_ENABLE: - if (get_user(remote_num_handles, (unsigned __user *)(arg + - offsetof(struct kcov_remote_arg, num_handles)))) + if (get_user(remote_num_handles, + (unsigned __user *)(arg + + offsetof(struct kcov_remote_arg, + num_handles)))) return -EFAULT; if (remote_num_handles > KCOV_REMOTE_MAX_HANDLES) return -EINVAL; - remote_arg_size =3D struct_size(remote_arg, handles, - remote_num_handles); + remote_arg_size =3D + struct_size(remote_arg, handles, remote_num_handles); remote_arg =3D memdup_user((void __user *)arg, remote_arg_size); if (IS_ERR(remote_arg)) return PTR_ERR(remote_arg); @@ -758,11 +762,11 @@ static long kcov_ioctl(struct file *filep, unsigned i= nt cmd, unsigned long arg) } =20 static const struct file_operations kcov_fops =3D { - .open =3D kcov_open, - .unlocked_ioctl =3D kcov_ioctl, - .compat_ioctl =3D kcov_ioctl, - .mmap =3D kcov_mmap, - .release =3D kcov_close, + .open =3D kcov_open, + .unlocked_ioctl =3D kcov_ioctl, + .compat_ioctl =3D kcov_ioctl, + .mmap =3D kcov_mmap, + .release =3D kcov_close, }; =20 /* @@ -836,8 +840,8 @@ static void kcov_remote_softirq_stop(struct task_struct= *t) =20 if (data->saved_kcov) { kcov_start(t, data->saved_kcov, data->saved_size, - data->saved_area, data->saved_mode, - data->saved_sequence); + data->saved_area, data->saved_mode, + data->saved_sequence); data->saved_mode =3D 0; data->saved_size =3D 0; data->saved_area =3D NULL; @@ -891,7 +895,7 @@ void kcov_remote_start(u64 handle) return; } kcov_debug("handle =3D %llx, context: %s\n", handle, - in_task() ? "task" : "softirq"); + in_task() ? "task" : "softirq"); kcov =3D remote->kcov; /* Put in kcov_remote_stop(). */ kcov_get(kcov); @@ -931,12 +935,11 @@ void kcov_remote_start(u64 handle) kcov_start(t, kcov, size, area, mode, sequence); =20 local_unlock_irqrestore(&kcov_percpu_data.lock, flags); - } EXPORT_SYMBOL(kcov_remote_start); =20 static void kcov_move_area(enum kcov_mode mode, void *dst_area, - unsigned int dst_area_size, void *src_area) + unsigned int dst_area_size, void *src_area) { u64 word_size =3D sizeof(unsigned long); u64 count_size, entry_size_log; @@ -944,8 +947,8 @@ static void kcov_move_area(enum kcov_mode mode, void *d= st_area, void *dst_entries, *src_entries; u64 dst_occupied, dst_free, bytes_to_move, entries_moved; =20 - kcov_debug("%px %u <=3D %px %lu\n", - dst_area, dst_area_size, src_area, *(unsigned long *)src_area); + kcov_debug("%px %u <=3D %px %lu\n", dst_area, dst_area_size, src_area, + *(unsigned long *)src_area); =20 switch (mode) { case KCOV_MODE_TRACE_PC: @@ -967,8 +970,8 @@ static void kcov_move_area(enum kcov_mode mode, void *d= st_area, } =20 /* As arm can't divide u64 integers use log of entry size. */ - if (dst_len > ((dst_area_size * word_size - count_size) >> - entry_size_log)) + if (dst_len > + ((dst_area_size * word_size - count_size) >> entry_size_log)) return; dst_occupied =3D count_size + (dst_len << entry_size_log); dst_free =3D dst_area_size * word_size - dst_occupied; @@ -1100,7 +1103,8 @@ static int __init kcov_init(void) =20 for_each_possible_cpu(cpu) { void *area =3D vmalloc_node(CONFIG_KCOV_IRQ_AREA_SIZE * - sizeof(unsigned long), cpu_to_node(cpu)); + sizeof(unsigned long), + cpu_to_node(cpu)); if (!area) return -ENOMEM; per_cpu_ptr(&kcov_percpu_data, cpu)->irq_area =3D area; --=20 2.49.0.604.gff1f9ca942-goog