From mboxrd@z Thu Jan 1 00:00:00 1970 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 EDCED468D for ; Mon, 11 Dec 2023 00:55:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="UzrgTTZK" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B8F9BC433C7; Mon, 11 Dec 2023 00:55:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1702256113; bh=5X50RuiZSqRL7O1oWjV6gvyGLd3hZfKo/uUYJJM6XJY=; h=Date:To:From:Subject:From; b=UzrgTTZKQHl4dPtZ4a15ClEhEY4qNpM1gm0VHERD6QyY5QCrlApCyOZ9ED7JANy0c 8uWbHHq1FvkDTr0xFLCw+VoGnVyn35qKLPUjbLfoDHUUVPmCZDq1oQ3wqi5kLrHuvB PBczkXvmc6bwTAD+7uHpDsvah2S0BFBZTFaZm5hU= Date: Sun, 10 Dec 2023 16:55:13 -0800 To: mm-commits@vger.kernel.org,ira.weiny@intel.com,fabio.maria.de.francesco@linux.intel.com,akpm@linux-foundation.org From: Andrew Morton Subject: [merged mm-stable] mm-page_poison-replace-kmap_atomic-with-kmap_local_page.patch removed from -mm tree Message-Id: <20231211005513.B8F9BC433C7@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The quilt patch titled Subject: mm/page_poison: replace kmap_atomic() with kmap_local_page() has been removed from the -mm tree. Its filename was mm-page_poison-replace-kmap_atomic-with-kmap_local_page.patch This patch was dropped because it was merged into the mm-stable branch of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm ------------------------------------------------------ From: "Fabio M. De Francesco" Subject: mm/page_poison: replace kmap_atomic() with kmap_local_page() Date: Mon, 20 Nov 2023 15:28:23 +0100 kmap_atomic() has been deprecated in favor of kmap_local_page(). Therefore, replace kmap_atomic() with kmap_local_page(). kmap_atomic() is implemented like a kmap_local_page() which also disables page-faults and preemption (the latter only in !PREEMPT_RT kernels). The kernel virtual addresses returned by these two API are only valid in the context of the callers (i.e., they cannot be handed to other threads). With kmap_local_page() the mappings are per thread and CPU local like in kmap_atomic(); however, they can handle page-faults and can be called from any context (including interrupts). The tasks that call kmap_local_page() can be preempted and, when they are scheduled to run again, the kernel virtual addresses are restored and are still valid. The code blocks between the mappings and un-mappings do not rely on the above-mentioned side effects of kmap_atomic(), so that mere replacements of the old API with the new one is all that they require (i.e., there is no need to explicitly call pagefault_disable() and/or preempt_disable()). Link: https://lkml.kernel.org/r/20231120142836.7219-1-fabio.maria.de.francesco@linux.intel.com Signed-off-by: Fabio M. De Francesco Cc: Ira Weiny Signed-off-by: Andrew Morton --- mm/page_poison.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) --- a/mm/page_poison.c~mm-page_poison-replace-kmap_atomic-with-kmap_local_page +++ a/mm/page_poison.c @@ -21,13 +21,13 @@ early_param("page_poison", early_page_po static void poison_page(struct page *page) { - void *addr = kmap_atomic(page); + void *addr = kmap_local_page(page); /* KASAN still think the page is in-use, so skip it. */ kasan_disable_current(); memset(kasan_reset_tag(addr), PAGE_POISON, PAGE_SIZE); kasan_enable_current(); - kunmap_atomic(addr); + kunmap_local(addr); } void __kernel_poison_pages(struct page *page, int n) @@ -77,7 +77,7 @@ static void unpoison_page(struct page *p { void *addr; - addr = kmap_atomic(page); + addr = kmap_local_page(page); kasan_disable_current(); /* * Page poisoning when enabled poisons each and every page @@ -86,7 +86,7 @@ static void unpoison_page(struct page *p */ check_poison_mem(page, kasan_reset_tag(addr), PAGE_SIZE); kasan_enable_current(); - kunmap_atomic(addr); + kunmap_local(addr); } void __kernel_unpoison_pages(struct page *page, int n) _ Patches currently in -mm which might be from fabio.maria.de.francesco@linux.intel.com are