From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andrew Morton Subject: [patch 22/35] x86/mm: introduce __set_memory_prot() Date: Fri, 10 Apr 2020 14:33:28 -0700 Message-ID: <20200410213328.D_HMstmTV%akpm@linux-foundation.org> References: <20200410143047.bf34a933ce1affdc042c7c80@linux-foundation.org> Reply-To: linux-kernel@vger.kernel.org Return-path: Received: from mail.kernel.org ([198.145.29.99]:47532 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726594AbgDJVda (ORCPT ); Fri, 10 Apr 2020 17:33:30 -0400 In-Reply-To: <20200410143047.bf34a933ce1affdc042c7c80@linux-foundation.org> Sender: mm-commits-owner@vger.kernel.org List-Id: mm-commits@vger.kernel.org To: akpm@linux-foundation.org, benh@kernel.crashing.org, bp@alien8.de, catalin.marinas@arm.com, dan.j.williams@intel.com, dave.hansen@linux.intel.com, david@redhat.com, ebadger@gigaio.com, hch@lst.de, hpa@zytor.com, jgg@ziepe.ca, linux-mm@kvack.org, logang@deltatee.com, luto@kernel.org, mhocko@suse.com, mingo@redhat.com, mm-commits@vger.kernel.org, mpe@ellerman.id.au, paulus@samba.org, peterz@infradead.org, tglx@linutronix.de, torvalds@linux-foundation.org, will@kernel.org From: Logan Gunthorpe Subject: x86/mm: introduce __set_memory_prot() For use in the 32bit arch_add_memory() to set the pgprot type of the memory to add. Link: http://lkml.kernel.org/r/20200306170846.9333-5-logang@deltatee.com Signed-off-by: Logan Gunthorpe Reviewed-by: Dan Williams Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Borislav Petkov Cc: "H. Peter Anvin" Cc: Dave Hansen Cc: Andy Lutomirski Cc: Peter Zijlstra Cc: Benjamin Herrenschmidt Cc: Catalin Marinas Cc: Christoph Hellwig Cc: David Hildenbrand Cc: Eric Badger Cc: Jason Gunthorpe Cc: Michael Ellerman Cc: Michal Hocko Cc: Paul Mackerras Cc: Will Deacon Signed-off-by: Andrew Morton --- arch/x86/include/asm/set_memory.h | 1 + arch/x86/mm/pat/set_memory.c | 13 +++++++++++++ 2 files changed, 14 insertions(+) --- a/arch/x86/include/asm/set_memory.h~x86-mm-introduce-__set_memory_prot +++ a/arch/x86/include/asm/set_memory.h @@ -34,6 +34,7 @@ * The caller is required to take care of these. */ +int __set_memory_prot(unsigned long addr, int numpages, pgprot_t prot); int _set_memory_uc(unsigned long addr, int numpages); int _set_memory_wc(unsigned long addr, int numpages); int _set_memory_wt(unsigned long addr, int numpages); --- a/arch/x86/mm/pat/set_memory.c~x86-mm-introduce-__set_memory_prot +++ a/arch/x86/mm/pat/set_memory.c @@ -1795,6 +1795,19 @@ static inline int cpa_clear_pages_array( CPA_PAGES_ARRAY, pages); } +/* + * _set_memory_prot is an internal helper for callers that have been passed + * a pgprot_t value from upper layers and a reservation has already been taken. + * If you want to set the pgprot to a specific page protocol, use the + * set_memory_xx() functions. + */ +int __set_memory_prot(unsigned long addr, int numpages, pgprot_t prot) +{ + return change_page_attr_set_clr(&addr, numpages, prot, + __pgprot(~pgprot_val(prot)), 0, 0, + NULL); +} + int _set_memory_uc(unsigned long addr, int numpages) { /* _