From nobody Sat Feb 7 07:44:06 2026 Received: from mail-pg1-f202.google.com (mail-pg1-f202.google.com [209.85.215.202]) (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 0A8011DDC2E for ; Tue, 26 Nov 2024 18:40:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.215.202 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732646428; cv=none; b=Xtc426KFwhV9FTHv4lzK62tgFKEF+gnLa8mhCsDLrRrUDHh+AobXaSe9QTNkZI14HxRl2PKMdWRGbmeQXP3AM1iUyNZAznouFAJTB8hVhTuy9Nj0M8FQURdSpTZMYqJWO1kzLr6aFNimI14kA9/QBqYicBzrYY+992pCbG2gHvI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732646428; c=relaxed/simple; bh=1b3dMELyLxamvht5e+LV7/lTV4/qEiNlyQkh3+gkwdU=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=nSG7IjixNcUwv6x9FiQEhajuZZTFkQx/K20Z11nPNf6J9d2cRNvfDe/mNHkV0LT3+e5vf7F82AYm3HM4y5O0mPp5oy3iQwDdn9PYRTAgaGzDnS4ijQUSH29+1d4NJGMojrF8dxkpAuQX0JN7XEkOyMPexfwrYxhk+wlA+C27YlM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--cmllamas.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=YlGh/mmK; arc=none smtp.client-ip=209.85.215.202 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--cmllamas.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="YlGh/mmK" Received: by mail-pg1-f202.google.com with SMTP id 41be03b00d2f7-7eaac1e95ffso5323252a12.2 for ; Tue, 26 Nov 2024 10:40:26 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1732646426; x=1733251226; 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=awrGx+G7Hl/os9Vh+fl4vRm8eJvHryPmjNf0DeKDZHM=; b=YlGh/mmKXVEu4lP2T2PV5LBrqJNvjo7uuKmiIf3UMPl3WKVaBvuenHhhMc4elXv6mJ R1Aym0yoquZXqxBuE7vRUfcy37ea0HP/ELeToOsvPjDGsDcIPKq5On+5HJyazarqQveY axjsGhpRwMCeMYT873Mz/lHpHC0+UB5kBL5V3dKzzVLTQlVJyPoIVzWWdhfU7+keB1OD I6oT9xVrmFDfNtTPYMezEm1F4EC0tbhBHiZ5zdVCL6WXfELGmGGiljcnzjcElcWPWjmN cJq50ov5/wg/B/RptnthpBw+MTPD593jnkM7F/Y4wD43DGJ7cj/JQOdNEXC8EM2xXX+/ 1JoA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1732646426; x=1733251226; 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=awrGx+G7Hl/os9Vh+fl4vRm8eJvHryPmjNf0DeKDZHM=; b=S4TxR1fOguKvKsiDETgb5G3/zxQLLCwGlw8QUW831TI9VbTlu9VvyTDXMvYve9Jfq3 OGh0ln3PX9w8SxZp2TK/kVxg6c4Zuws5Kzo0QGt1AVRbhzE43xNh1wZPRiuxcfOy9zrv R2kQNQwiDECUtfEjVdBvdG3WS6hMaQMkyObxzu0d4rJoaOW3MqLjCYTPW78j4HmwFp8O 7qDDris6PdtVtPFUO7duyIv38bFs63JKrP3yU7Id09gG6vidhzszVhmBfN953xC7twDS clBGXq+yO9lHb20OyGREduGQrRGrDLBg2W/UJYhiKycUWsC8DiwQMEP3jQNqkEkCVfaz nC+A== X-Gm-Message-State: AOJu0YxmFEurlrAHJBN3l1mE4AZQeke+7m9+BoYUb7xLtoaeeG0tcOjH rbV/aYA5l235JmkLxbw4YIGnnbLHAx6xwnoeIC9iDOMb29Ts7z7gfEBbjlvOeEjsesmYr/auz9Y N65F6gymwsA== X-Google-Smtp-Source: AGHT+IHDDpNX9GMPQmz8d6u/R0ATzXftiCJYQ3Dt7Ne1B3Je173GsCwR60jDp3J5zjrLR96SKwZIyvCEP+TZ6g== X-Received: from pfwo3.prod.google.com ([2002:a05:6a00:1bc3:b0:724:d819:72]) (user=cmllamas job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6a20:158a:b0:1cf:27bf:8e03 with SMTP id adf61e73a8af0-1e0e0b10997mr656858637.26.1732646426258; Tue, 26 Nov 2024 10:40:26 -0800 (PST) Date: Tue, 26 Nov 2024 18:40:04 +0000 In-Reply-To: <20241126184021.45292-1-cmllamas@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20241126184021.45292-1-cmllamas@google.com> X-Mailer: git-send-email 2.47.0.338.g60cca15819-goog Message-ID: <20241126184021.45292-2-cmllamas@google.com> Subject: [PATCH v5 1/9] Revert "binder: switch alloc->mutex to spinlock_t" From: Carlos Llamas To: Greg Kroah-Hartman , "=?UTF-8?q?Arve=20Hj=C3=B8nnev=C3=A5g?=" , Todd Kjos , Martijn Coenen , Joel Fernandes , Christian Brauner , Carlos Llamas , Suren Baghdasaryan Cc: linux-kernel@vger.kernel.org, kernel-team@android.com, Mukesh Ojha Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" This reverts commit 7710e2cca32e7f3958480e8bd44f50e29d0c2509. In preparation for concurrent page installations, restore the original alloc->mutex which will serialize zap_page_range_single() against page installations in subsequent patches (instead of the mmap_sem). Resolved trivial conflicts with commit 2c10a20f5e84a ("binder_alloc: Fix sleeping function called from invalid context") and commit da0c02516c50 ("mm/list_lru: simplify the list_lru walk callback function"). Cc: Mukesh Ojha Reviewed-by: Suren Baghdasaryan Signed-off-by: Carlos Llamas --- drivers/android/binder_alloc.c | 46 +++++++++++++++++----------------- drivers/android/binder_alloc.h | 10 ++++---- 2 files changed, 28 insertions(+), 28 deletions(-) diff --git a/drivers/android/binder_alloc.c b/drivers/android/binder_alloc.c index a738e7745865..52f6aa3232e1 100644 --- a/drivers/android/binder_alloc.c +++ b/drivers/android/binder_alloc.c @@ -169,9 +169,9 @@ struct binder_buffer *binder_alloc_prepare_to_free(stru= ct binder_alloc *alloc, { struct binder_buffer *buffer; =20 - spin_lock(&alloc->lock); + mutex_lock(&alloc->mutex); buffer =3D binder_alloc_prepare_to_free_locked(alloc, user_ptr); - spin_unlock(&alloc->lock); + mutex_unlock(&alloc->mutex); return buffer; } =20 @@ -597,10 +597,10 @@ struct binder_buffer *binder_alloc_new_buf(struct bin= der_alloc *alloc, if (!next) return ERR_PTR(-ENOMEM); =20 - spin_lock(&alloc->lock); + mutex_lock(&alloc->mutex); buffer =3D binder_alloc_new_buf_locked(alloc, next, size, is_async); if (IS_ERR(buffer)) { - spin_unlock(&alloc->lock); + mutex_unlock(&alloc->mutex); goto out; } =20 @@ -608,7 +608,7 @@ struct binder_buffer *binder_alloc_new_buf(struct binde= r_alloc *alloc, buffer->offsets_size =3D offsets_size; buffer->extra_buffers_size =3D extra_buffers_size; buffer->pid =3D current->tgid; - spin_unlock(&alloc->lock); + mutex_unlock(&alloc->mutex); =20 ret =3D binder_install_buffer_pages(alloc, buffer, size); if (ret) { @@ -785,17 +785,17 @@ void binder_alloc_free_buf(struct binder_alloc *alloc, * We could eliminate the call to binder_alloc_clear_buf() * from binder_alloc_deferred_release() by moving this to * binder_free_buf_locked(). However, that could - * increase contention for the alloc->lock if clear_on_free - * is used frequently for large buffers. This lock is not + * increase contention for the alloc mutex if clear_on_free + * is used frequently for large buffers. The mutex is not * needed for correctness here. */ if (buffer->clear_on_free) { binder_alloc_clear_buf(alloc, buffer); buffer->clear_on_free =3D false; } - spin_lock(&alloc->lock); + mutex_lock(&alloc->mutex); binder_free_buf_locked(alloc, buffer); - spin_unlock(&alloc->lock); + mutex_unlock(&alloc->mutex); } =20 /** @@ -893,7 +893,7 @@ void binder_alloc_deferred_release(struct binder_alloc = *alloc) struct binder_buffer *buffer; =20 buffers =3D 0; - spin_lock(&alloc->lock); + mutex_lock(&alloc->mutex); BUG_ON(alloc->vma); =20 while ((n =3D rb_first(&alloc->allocated_buffers))) { @@ -940,7 +940,7 @@ void binder_alloc_deferred_release(struct binder_alloc = *alloc) page_count++; } } - spin_unlock(&alloc->lock); + mutex_unlock(&alloc->mutex); kvfree(alloc->pages); if (alloc->mm) mmdrop(alloc->mm); @@ -964,7 +964,7 @@ void binder_alloc_print_allocated(struct seq_file *m, struct binder_buffer *buffer; struct rb_node *n; =20 - spin_lock(&alloc->lock); + mutex_lock(&alloc->mutex); for (n =3D rb_first(&alloc->allocated_buffers); n; n =3D rb_next(n)) { buffer =3D rb_entry(n, struct binder_buffer, rb_node); seq_printf(m, " buffer %d: %lx size %zd:%zd:%zd %s\n", @@ -974,7 +974,7 @@ void binder_alloc_print_allocated(struct seq_file *m, buffer->extra_buffers_size, buffer->transaction ? "active" : "delivered"); } - spin_unlock(&alloc->lock); + mutex_unlock(&alloc->mutex); } =20 /** @@ -991,7 +991,7 @@ void binder_alloc_print_pages(struct seq_file *m, int lru =3D 0; int free =3D 0; =20 - spin_lock(&alloc->lock); + mutex_lock(&alloc->mutex); /* * Make sure the binder_alloc is fully initialized, otherwise we might * read inconsistent state. @@ -1007,7 +1007,7 @@ void binder_alloc_print_pages(struct seq_file *m, lru++; } } - spin_unlock(&alloc->lock); + mutex_unlock(&alloc->mutex); seq_printf(m, " pages: %d:%d:%d\n", active, lru, free); seq_printf(m, " pages high watermark: %zu\n", alloc->pages_high); } @@ -1023,10 +1023,10 @@ int binder_alloc_get_allocated_count(struct binder_= alloc *alloc) struct rb_node *n; int count =3D 0; =20 - spin_lock(&alloc->lock); + mutex_lock(&alloc->mutex); for (n =3D rb_first(&alloc->allocated_buffers); n !=3D NULL; n =3D rb_nex= t(n)) count++; - spin_unlock(&alloc->lock); + mutex_unlock(&alloc->mutex); return count; } =20 @@ -1070,8 +1070,8 @@ enum lru_status binder_alloc_free_page(struct list_he= ad *item, goto err_mmget; if (!mmap_read_trylock(mm)) goto err_mmap_read_lock_failed; - if (!spin_trylock(&alloc->lock)) - goto err_get_alloc_lock_failed; + if (!mutex_trylock(&alloc->mutex)) + goto err_get_alloc_mutex_failed; if (!page->page_ptr) goto err_page_already_freed; =20 @@ -1090,7 +1090,7 @@ enum lru_status binder_alloc_free_page(struct list_he= ad *item, trace_binder_unmap_kernel_end(alloc, index); =20 list_lru_isolate(lru, item); - spin_unlock(&alloc->lock); + mutex_unlock(&alloc->mutex); spin_unlock(&lru->lock); =20 if (vma) { @@ -1109,8 +1109,8 @@ enum lru_status binder_alloc_free_page(struct list_he= ad *item, =20 err_invalid_vma: err_page_already_freed: - spin_unlock(&alloc->lock); -err_get_alloc_lock_failed: + mutex_unlock(&alloc->mutex); +err_get_alloc_mutex_failed: mmap_read_unlock(mm); err_mmap_read_lock_failed: mmput_async(mm); @@ -1145,7 +1145,7 @@ void binder_alloc_init(struct binder_alloc *alloc) alloc->pid =3D current->group_leader->pid; alloc->mm =3D current->mm; mmgrab(alloc->mm); - spin_lock_init(&alloc->lock); + mutex_init(&alloc->mutex); INIT_LIST_HEAD(&alloc->buffers); } =20 diff --git a/drivers/android/binder_alloc.h b/drivers/android/binder_alloc.h index c02c8ebcb466..33c5f971c0a5 100644 --- a/drivers/android/binder_alloc.h +++ b/drivers/android/binder_alloc.h @@ -9,7 +9,7 @@ #include #include #include -#include +#include #include #include #include @@ -72,7 +72,7 @@ struct binder_lru_page { =20 /** * struct binder_alloc - per-binder proc state for binder allocator - * @lock: protects binder_alloc fields + * @mutex: protects binder_alloc fields * @vma: vm_area_struct passed to mmap_handler * (invariant after mmap) * @mm: copy of task->mm (invariant after open) @@ -96,7 +96,7 @@ struct binder_lru_page { * struct binder_buffer objects used to track the user buffers */ struct binder_alloc { - spinlock_t lock; + struct mutex mutex; struct vm_area_struct *vma; struct mm_struct *mm; unsigned long buffer; @@ -153,9 +153,9 @@ binder_alloc_get_free_async_space(struct binder_alloc *= alloc) { size_t free_async_space; =20 - spin_lock(&alloc->lock); + mutex_lock(&alloc->mutex); free_async_space =3D alloc->free_async_space; - spin_unlock(&alloc->lock); + mutex_unlock(&alloc->mutex); return free_async_space; } =20 --=20 2.47.0.338.g60cca15819-goog