From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail.ozlabs.org (gandalf.ozlabs.org [150.107.74.76]) (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 D701C44366 for ; Wed, 7 Aug 2024 12:41:18 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=150.107.74.76 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723034481; cv=none; b=gSTEOkal3hjv8L97qwuhCOJC4m+/b3E8gNsqIPiGiimWQvgMZqE61umA3bRjsPcVfS7ug+AeYtdgam+cDujcPsvb6Tx5Kl5CwxbKFIZMpg4wSWZKhaE47RLWrrCEteyB3rgCD+EAG565iS0uXo6+mg33oWFXu4UWjevDcSpsjks= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723034481; c=relaxed/simple; bh=XT6OZNWGYzIxYdVySaYbm4LJJTkDHxMq495VN2H1fDA=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=Kbbg6r3DvNGIUnW1cKRks1wXQyf+X1a5FkyJnFC6Bg8Fx6eYmq6kxgcFHgtmuPO32GpiEbf3g6i/QPGxYidiY9h3YbDN/+/0NzX5w2fhqjESrOqiBOmauinxKjwO2RojQZTdtsizC+sFAixFdt4g1bijOMQoytrsS8wbdjEU7ww= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=ellerman.id.au; spf=pass smtp.mailfrom=ellerman.id.au; dkim=pass (2048-bit key) header.d=ellerman.id.au header.i=@ellerman.id.au header.b=rouwZkpk; arc=none smtp.client-ip=150.107.74.76 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=ellerman.id.au Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=ellerman.id.au Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=ellerman.id.au header.i=@ellerman.id.au header.b="rouwZkpk" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ellerman.id.au; s=201909; t=1723034477; bh=MLPB8NX1mr26290JEeNr8bLoMbPmIYChrue1EMzqpmE=; h=From:To:Cc:Subject:Date:From; b=rouwZkpkpwvm1AETzWWBAHxWziQvMhXI7iOx9YMA0xiCUgpuaCB3OE5HF0Pg+RlNh G3daTz+Tsbz6MpBaGyhhCCfsnSMzZEqGECM/XMXVS0nwgP7kft0v880B3rAe+saMjf Vaycc+vl9gc6KZb6bgn9Iwgvf4n8ltCZJf0qL3Wb1XQlc/uZPj6bWNvwrIwNDQd1Ty i/WYNEUltvKBnhZslmbUBSN8NbtC8QkEhwoxdlSN69lR65z2WWM5C+U4vXNkH1GIVs pWyjJA/ZkK4lL+5TXTmGDVLroUA6EGt+g5M4B9aaZMjjKnIqpl5mATpNfWxGm2H0Md DxfcMry9PYr8g== Received: from authenticated.ozlabs.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mail.ozlabs.org (Postfix) with ESMTPSA id 4Wf8tN6TY9z4wd6; Wed, 7 Aug 2024 22:41:16 +1000 (AEST) From: Michael Ellerman To: Cc: , torvalds@linux-foundation.org, akpm@linux-foundation.org, christophe.leroy@csgroup.eu, jeffxu@chromium.org, jeffxu@google.com, Liam.Howlett@oracle.com, linux-kernel@vger.kernel.org, npiggin@gmail.com, oliver.sang@intel.com, pedro.falcato@gmail.com Subject: [PATCH 1/4] mm: Add optional close() to struct vm_special_mapping Date: Wed, 7 Aug 2024 22:41:00 +1000 Message-ID: <20240807124103.85644-1-mpe@ellerman.id.au> X-Mailer: git-send-email 2.45.2 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Add an optional close() callback to struct vm_special_mapping. It will be used, by powerpc at least, to handle unmapping of the VDSO. Suggested-by: Linus Torvalds Signed-off-by: Michael Ellerman --- include/linux/mm_types.h | 2 ++ mm/mmap.c | 3 +++ 2 files changed, 5 insertions(+) diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h index 485424979254..ef32d87a3adc 100644 --- a/include/linux/mm_types.h +++ b/include/linux/mm_types.h @@ -1313,6 +1313,8 @@ struct vm_special_mapping { int (*mremap)(const struct vm_special_mapping *sm, struct vm_area_struct *new_vma); + void (*close)(const struct vm_special_mapping *sm, + struct vm_area_struct *vma); }; enum tlb_flush_reason { diff --git a/mm/mmap.c b/mm/mmap.c index d0dfc85b209b..24bd6aa9155c 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -3624,6 +3624,9 @@ static vm_fault_t special_mapping_fault(struct vm_fault *vmf); */ static void special_mapping_close(struct vm_area_struct *vma) { + const struct vm_special_mapping *sm = vma->vm_private_data; + if (sm->close) + sm->close(sm, vma); } static const char *special_mapping_name(struct vm_area_struct *vma) -- 2.45.2