From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754593AbdEIPh4 (ORCPT ); Tue, 9 May 2017 11:37:56 -0400 Received: from mx2.suse.de ([195.135.220.15]:54561 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1754422AbdEIPhO (ORCPT ); Tue, 9 May 2017 11:37:14 -0400 Date: Tue, 9 May 2017 17:37:02 +0200 From: Michal Hocko To: Linus Torvalds , Andrew Morton Cc: Tobias Klauser , linux-mm@kvack.org, LKML Subject: Re: [PATCH] mm, vmalloc: fix vmalloc users tracking properly Message-ID: <20170509153702.GR6481@dhcp22.suse.cz> References: <20170509144108.31910-1-mhocko@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20170509144108.31910-1-mhocko@kernel.org> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Sigh. I've apparently managed to screw up again. This should address the nommu breakage reported by 0-day. --- >>From 95d49bf93ae4467f3f918520ec03b3596e5b36cc Mon Sep 17 00:00:00 2001 From: Michal Hocko Date: Tue, 9 May 2017 16:27:39 +0200 Subject: [PATCH] mm, vmalloc: fix vmalloc users tracking properly 1f5307b1e094 ("mm, vmalloc: properly track vmalloc users") has pulled asm/pgtable.h include dependency to linux/vmalloc.h and that turned out to be a bad idea for some architectures. E.g. m68k fails with In file included from arch/m68k/include/asm/pgtable_mm.h:145:0, from arch/m68k/include/asm/pgtable.h:4, from include/linux/vmalloc.h:9, from arch/m68k/kernel/module.c:9: arch/m68k/include/asm/mcf_pgtable.h: In function 'nocache_page': >> arch/m68k/include/asm/mcf_pgtable.h:339:43: error: 'init_mm' undeclared (first use in this function) #define pgd_offset_k(address) pgd_offset(&init_mm, address) as spotted by kernel build bot. nios2 fails for other reason In file included from ./include/asm-generic/io.h:767:0, from ./arch/nios2/include/asm/io.h:61, from ./include/linux/io.h:25, from ./arch/nios2/include/asm/pgtable.h:18, from ./include/linux/mm.h:70, from ./include/linux/pid_namespace.h:6, from ./include/linux/ptrace.h:9, from ./arch/nios2/include/uapi/asm/elf.h:23, from ./arch/nios2/include/asm/elf.h:22, from ./include/linux/elf.h:4, from ./include/linux/module.h:15, from init/main.c:16: ./include/linux/vmalloc.h: In function '__vmalloc_node_flags': ./include/linux/vmalloc.h:99:40: error: 'PAGE_KERNEL' undeclared (first use in this function); did you mean 'GFP_KERNEL'? which is due to the newly added #include , which on nios2 includes and thus and which again includes . Tweaking that around just turns out a bigger headache than necessary. This patch reverts 1f5307b1e094 and reimplements the original fix in a different way. __vmalloc_node_flags can stay static inline which will cover vmalloc* functions. We only have one external user (kvmalloc_node) and we can export __vmalloc_node_flags_caller and provide the caller directly. This is much simpler and it doesn't really need any games with header files. Fixes: 1f5307b1e094 ("mm, vmalloc: properly track vmalloc users") Signed-off-by: Michal Hocko --- include/linux/vmalloc.h | 17 ++++++----------- mm/util.c | 3 ++- mm/vmalloc.c | 18 +++++++++++++++++- 3 files changed, 25 insertions(+), 13 deletions(-) diff --git a/include/linux/vmalloc.h b/include/linux/vmalloc.h index 0328ce003992..268b3a919a5f 100644 --- a/include/linux/vmalloc.h +++ b/include/linux/vmalloc.h @@ -6,7 +6,6 @@ #include #include #include /* pgprot_t */ -#include /* PAGE_KERNEL */ #include struct vm_area_struct; /* vma defining user mapping in mm_types.h */ @@ -83,22 +82,18 @@ extern void *__vmalloc_node_range(unsigned long size, unsigned long align, const void *caller); #ifndef CONFIG_MMU extern void *__vmalloc_node_flags(unsigned long size, int node, gfp_t flags); +static inline void *__vmalloc_node_flags_caller(unsigned long size, int node, gfp_t flags, void* caller) +{ + return __vmalloc_node_flags(size, node, flags); +} #else -extern void *__vmalloc_node(unsigned long size, unsigned long align, - gfp_t gfp_mask, pgprot_t prot, - int node, const void *caller); - /* * We really want to have this inlined due to caller tracking. This * function is used by the highlevel vmalloc apis and so we want to track * their callers and inlining will achieve that. */ -static inline void *__vmalloc_node_flags(unsigned long size, - int node, gfp_t flags) -{ - return __vmalloc_node(size, 1, flags, PAGE_KERNEL, - node, __builtin_return_address(0)); -} +extern void *__vmalloc_node_flags_caller(unsigned long size, + int node, gfp_t flags, void* caller); #endif extern void vfree(const void *addr); diff --git a/mm/util.c b/mm/util.c index 718154debc87..464df3489903 100644 --- a/mm/util.c +++ b/mm/util.c @@ -382,7 +382,8 @@ void *kvmalloc_node(size_t size, gfp_t flags, int node) if (ret || size <= PAGE_SIZE) return ret; - return __vmalloc_node_flags(size, node, flags); + return __vmalloc_node_flags_caller(size, node, flags, + __builtin_return_address(0)); } EXPORT_SYMBOL(kvmalloc_node); diff --git a/mm/vmalloc.c b/mm/vmalloc.c index 1dda6d8a200a..4a1de70e68e1 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -1649,6 +1649,9 @@ void *vmap(struct page **pages, unsigned int count, } EXPORT_SYMBOL(vmap); +static void *__vmalloc_node(unsigned long size, unsigned long align, + gfp_t gfp_mask, pgprot_t prot, + int node, const void *caller); static void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask, pgprot_t prot, int node) { @@ -1791,7 +1794,7 @@ void *__vmalloc_node_range(unsigned long size, unsigned long align, * with mm people. * */ -void *__vmalloc_node(unsigned long size, unsigned long align, +static void *__vmalloc_node(unsigned long size, unsigned long align, gfp_t gfp_mask, pgprot_t prot, int node, const void *caller) { @@ -1806,6 +1809,19 @@ void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot) } EXPORT_SYMBOL(__vmalloc); +static inline void *__vmalloc_node_flags(unsigned long size, + int node, gfp_t flags) +{ + return __vmalloc_node(size, 1, flags, PAGE_KERNEL, + node, __builtin_return_address(0)); +} + + +void *__vmalloc_node_flags_caller(unsigned long size, int node, gfp_t flags, void *caller) +{ + return __vmalloc_node(size, 1, flags, PAGE_KERNEL, node, caller); +} + /** * vmalloc - allocate virtually contiguous memory * @size: allocation size -- 2.11.0 -- Michal Hocko SUSE Labs