From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:57046 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727875AbeHWMkT (ORCPT ); Thu, 23 Aug 2018 08:40:19 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Dave Hansen , Thomas Gleixner , keescook@google.com, aarcange@redhat.com, jgross@suse.com, jpoimboe@redhat.com, peterz@infradead.org, hughd@google.com, torvalds@linux-foundation.org, bp@alien8.de, luto@kernel.org, ak@linux.intel.com Subject: [PATCH 4.18 05/22] x86/mm/init: Add helper for freeing kernel image pages Date: Thu, 23 Aug 2018 09:56:31 +0200 Message-Id: <20180823074759.514011135@linuxfoundation.org> In-Reply-To: <20180823074759.234685844@linuxfoundation.org> References: <20180823074759.234685844@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: stable-owner@vger.kernel.org List-ID: 4.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Dave Hansen commit 6ea2738e0ca0e626c75202fb051c1e88d7a950fa upstream. When chunks of the kernel image are freed, free_init_pages() is used directly. Consolidate the three sites that do this. Also update the string to give an incrementally better description of that memory versus what was there before. Signed-off-by: Dave Hansen Signed-off-by: Thomas Gleixner Cc: keescook@google.com Cc: aarcange@redhat.com Cc: jgross@suse.com Cc: jpoimboe@redhat.com Cc: gregkh@linuxfoundation.org Cc: peterz@infradead.org Cc: hughd@google.com Cc: torvalds@linux-foundation.org Cc: bp@alien8.de Cc: luto@kernel.org Cc: ak@linux.intel.com Cc: Kees Cook Cc: Andrea Arcangeli Cc: Juergen Gross Cc: Josh Poimboeuf Cc: Greg Kroah-Hartman Cc: Peter Zijlstra Cc: Hugh Dickins Cc: Linus Torvalds Cc: Borislav Petkov Cc: Andy Lutomirski Cc: Andi Kleen Link: https://lkml.kernel.org/r/20180802225829.FE0E32EA@viggo.jf.intel.com Signed-off-by: Greg Kroah-Hartman --- arch/x86/include/asm/processor.h | 1 + arch/x86/mm/init.c | 15 ++++++++++++--- arch/x86/mm/init_64.c | 4 ++-- 3 files changed, 15 insertions(+), 5 deletions(-) --- a/arch/x86/include/asm/processor.h +++ b/arch/x86/include/asm/processor.h @@ -971,6 +971,7 @@ static inline uint32_t hypervisor_cpuid_ extern unsigned long arch_align_stack(unsigned long sp); extern void free_init_pages(char *what, unsigned long begin, unsigned long end); +extern void free_kernel_image_pages(void *begin, void *end); void default_idle(void); #ifdef CONFIG_XEN --- a/arch/x86/mm/init.c +++ b/arch/x86/mm/init.c @@ -775,13 +775,22 @@ void free_init_pages(char *what, unsigne } } +/* + * begin/end can be in the direct map or the "high kernel mapping" + * used for the kernel image only. free_init_pages() will do the + * right thing for either kind of address. + */ +void free_kernel_image_pages(void *begin, void *end) +{ + free_init_pages("unused kernel image", + (unsigned long)begin, (unsigned long)end); +} + void __ref free_initmem(void) { e820__reallocate_tables(); - free_init_pages("unused kernel", - (unsigned long)(&__init_begin), - (unsigned long)(&__init_end)); + free_kernel_image_pages(&__init_begin, &__init_end); } #ifdef CONFIG_BLK_DEV_INITRD --- a/arch/x86/mm/init_64.c +++ b/arch/x86/mm/init_64.c @@ -1283,8 +1283,8 @@ void mark_rodata_ro(void) set_memory_ro(start, (end-start) >> PAGE_SHIFT); #endif - free_init_pages("unused kernel", text_end, rodata_start); - free_init_pages("unused kernel", rodata_end, _sdata); + free_kernel_image_pages((void *)text_end, (void *)rodata_start); + free_kernel_image_pages((void *)rodata_end, (void *)_sdata); debug_checkwx();