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Date: Fri, 17 Jun 2011 09:58:16 -0700
From: Randy Dunlap <randy.dunlap@...cle.com>
To: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
CC: Mel Gorman <mgorman@...e.de>, dave@...ux.vnet.ibm.com,
linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
linux-mm@...ck.org, linux-fsdevel@...r.kernel.org, mingo@...e.hu
Subject: Re: [BUGFIX][PATCH][-rc3] Define a consolidated definition of node_start/end_pfn
for build error in page_cgroup.c (Was Re: mmotm 2011-06-15-16-56 uploaded
(mm/page_cgroup.c)
On 06/16/11 17:46, KAMEZAWA Hiroyuki wrote:
> On Thu, 16 Jun 2011 11:35:59 +0100
> Mel Gorman <mgorman@...e.de> wrote:
>
>> A caller that does node_end_pfn(nid++) will get a nasty surprise
>> due to side-effects. I know architectures currently get this wrong
>> including x86_64 but we might as well fix it up now. The definition
>> in arch/x86/include/asm/mmzone_32.h is immune to side-effects and
>> might be a better choice despite the use of a temporary variable.
>>
>
> Ok, here is a fixed one. Thank you for comments/review.
> ==
> From 507cc95c5ba2351bff16c5421255d1395a3b555b Mon Sep 17 00:00:00 2001
> From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> Date: Thu, 16 Jun 2011 17:28:07 +0900
> Subject: [PATCH] Fix node_start/end_pfn() definition for mm/page_cgroup.c
>
> commit 21a3c96 uses node_start/end_pfn(nid) for detection start/end
> of nodes. But, it's not defined in linux/mmzone.h but defined in
> /arch/???/include/mmzone.h which is included only under
> CONFIG_NEED_MULTIPLE_NODES=y.
>
> Then, we see
> mm/page_cgroup.c: In function 'page_cgroup_init':
> mm/page_cgroup.c:308: error: implicit declaration of function 'node_start_pfn'
> mm/page_cgroup.c:309: error: implicit declaration of function 'node_end_pfn'
>
> So, fixiing page_cgroup.c is an idea...
>
> But node_start_pfn()/node_end_pfn() is a very generic macro and
> should be implemented in the same manner for all archs.
> (m32r has different implementation...)
>
> This patch removes definitions of node_start/end_pfn() in each archs
> and defines a unified one in linux/mmzone.h. It's not under
> CONFIG_NEED_MULTIPLE_NODES, now.
>
> A result of macro expansion is here (mm/page_cgroup.c)
>
> for !NUMA
> start_pfn = ((&contig_page_data)->node_start_pfn);
> end_pfn = ({ pg_data_t *__pgdat = (&contig_page_data); __pgdat->node_start_pfn + __pgdat->node_spanned_pages;});
>
> for NUMA (x86-64)
> start_pfn = ((node_data[nid])->node_start_pfn);
> end_pfn = ({ pg_data_t *__pgdat = (node_data[nid]); __pgdat->node_start_pfn + __pgdat->node_spanned_pages;});
>
>
> Reported-by: Randy Dunlap <randy.dunlap@...cle.com>
> Reported-by: Ingo Molnar <mingo@...e.hu>
> Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Acked-by: Randy Dunlap <randy.dunlap@...cle.com>
Thanks.
>
> Changelog:
> - fixed to avoid using "nid" twice in node_end_pfn() macro.
> ---
> arch/alpha/include/asm/mmzone.h | 1 -
> arch/m32r/include/asm/mmzone.h | 8 +-------
> arch/parisc/include/asm/mmzone.h | 7 -------
> arch/powerpc/include/asm/mmzone.h | 7 -------
> arch/sh/include/asm/mmzone.h | 4 ----
> arch/sparc/include/asm/mmzone.h | 2 --
> arch/tile/include/asm/mmzone.h | 11 -----------
> arch/x86/include/asm/mmzone_32.h | 11 -----------
> arch/x86/include/asm/mmzone_64.h | 3 ---
> include/linux/mmzone.h | 7 +++++++
> 10 files changed, 8 insertions(+), 53 deletions(-)
>
> diff --git a/arch/alpha/include/asm/mmzone.h b/arch/alpha/include/asm/mmzone.h
> index 8af56ce..445dc42 100644
> --- a/arch/alpha/include/asm/mmzone.h
> +++ b/arch/alpha/include/asm/mmzone.h
> @@ -56,7 +56,6 @@ PLAT_NODE_DATA_LOCALNR(unsigned long p, int n)
> * Given a kernel address, find the home node of the underlying memory.
> */
> #define kvaddr_to_nid(kaddr) pa_to_nid(__pa(kaddr))
> -#define node_start_pfn(nid) (NODE_DATA(nid)->node_start_pfn)
>
> /*
> * Given a kaddr, LOCAL_BASE_ADDR finds the owning node of the memory
> diff --git a/arch/m32r/include/asm/mmzone.h b/arch/m32r/include/asm/mmzone.h
> index 9f3b5ac..115ced3 100644
> --- a/arch/m32r/include/asm/mmzone.h
> +++ b/arch/m32r/include/asm/mmzone.h
> @@ -14,12 +14,6 @@ extern struct pglist_data *node_data[];
> #define NODE_DATA(nid) (node_data[nid])
>
> #define node_localnr(pfn, nid) ((pfn) - NODE_DATA(nid)->node_start_pfn)
> -#define node_start_pfn(nid) (NODE_DATA(nid)->node_start_pfn)
> -#define node_end_pfn(nid) \
> -({ \
> - pg_data_t *__pgdat = NODE_DATA(nid); \
> - __pgdat->node_start_pfn + __pgdat->node_spanned_pages - 1; \
> -})
>
> #define pmd_page(pmd) (pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT))
> /*
> @@ -44,7 +38,7 @@ static __inline__ int pfn_to_nid(unsigned long pfn)
> int node;
>
> for (node = 0 ; node < MAX_NUMNODES ; node++)
> - if (pfn >= node_start_pfn(node) && pfn <= node_end_pfn(node))
> + if (pfn >= node_start_pfn(node) && pfn < node_end_pfn(node))
> break;
>
> return node;
> diff --git a/arch/parisc/include/asm/mmzone.h b/arch/parisc/include/asm/mmzone.h
> index 9608d2c..e67eb9c 100644
> --- a/arch/parisc/include/asm/mmzone.h
> +++ b/arch/parisc/include/asm/mmzone.h
> @@ -14,13 +14,6 @@ extern struct node_map_data node_data[];
>
> #define NODE_DATA(nid) (&node_data[nid].pg_data)
>
> -#define node_start_pfn(nid) (NODE_DATA(nid)->node_start_pfn)
> -#define node_end_pfn(nid) \
> -({ \
> - pg_data_t *__pgdat = NODE_DATA(nid); \
> - __pgdat->node_start_pfn + __pgdat->node_spanned_pages; \
> -})
> -
> /* We have these possible memory map layouts:
> * Astro: 0-3.75, 67.75-68, 4-64
> * zx1: 0-1, 257-260, 4-256
> diff --git a/arch/powerpc/include/asm/mmzone.h b/arch/powerpc/include/asm/mmzone.h
> index fd3fd58..7b58917 100644
> --- a/arch/powerpc/include/asm/mmzone.h
> +++ b/arch/powerpc/include/asm/mmzone.h
> @@ -38,13 +38,6 @@ u64 memory_hotplug_max(void);
> #define memory_hotplug_max() memblock_end_of_DRAM()
> #endif
>
> -/*
> - * Following are macros that each numa implmentation must define.
> - */
> -
> -#define node_start_pfn(nid) (NODE_DATA(nid)->node_start_pfn)
> -#define node_end_pfn(nid) (NODE_DATA(nid)->node_end_pfn)
> -
> #else
> #define memory_hotplug_max() memblock_end_of_DRAM()
> #endif /* CONFIG_NEED_MULTIPLE_NODES */
> diff --git a/arch/sh/include/asm/mmzone.h b/arch/sh/include/asm/mmzone.h
> index 8887baf..15a8496 100644
> --- a/arch/sh/include/asm/mmzone.h
> +++ b/arch/sh/include/asm/mmzone.h
> @@ -9,10 +9,6 @@
> extern struct pglist_data *node_data[];
> #define NODE_DATA(nid) (node_data[nid])
>
> -#define node_start_pfn(nid) (NODE_DATA(nid)->node_start_pfn)
> -#define node_end_pfn(nid) (NODE_DATA(nid)->node_start_pfn + \
> - NODE_DATA(nid)->node_spanned_pages)
> -
> static inline int pfn_to_nid(unsigned long pfn)
> {
> int nid;
> diff --git a/arch/sparc/include/asm/mmzone.h b/arch/sparc/include/asm/mmzone.h
> index e8c6487..99d9b9f 100644
> --- a/arch/sparc/include/asm/mmzone.h
> +++ b/arch/sparc/include/asm/mmzone.h
> @@ -8,8 +8,6 @@
> extern struct pglist_data *node_data[];
>
> #define NODE_DATA(nid) (node_data[nid])
> -#define node_start_pfn(nid) (NODE_DATA(nid)->node_start_pfn)
> -#define node_end_pfn(nid) (NODE_DATA(nid)->node_end_pfn)
>
> extern int numa_cpu_lookup_table[];
> extern cpumask_t numa_cpumask_lookup_table[];
> diff --git a/arch/tile/include/asm/mmzone.h b/arch/tile/include/asm/mmzone.h
> index c6344c4..9d3dbce 100644
> --- a/arch/tile/include/asm/mmzone.h
> +++ b/arch/tile/include/asm/mmzone.h
> @@ -40,17 +40,6 @@ static inline int pfn_to_nid(unsigned long pfn)
> return highbits_to_node[__pfn_to_highbits(pfn)];
> }
>
> -/*
> - * Following are macros that each numa implmentation must define.
> - */
> -
> -#define node_start_pfn(nid) (NODE_DATA(nid)->node_start_pfn)
> -#define node_end_pfn(nid) \
> -({ \
> - pg_data_t *__pgdat = NODE_DATA(nid); \
> - __pgdat->node_start_pfn + __pgdat->node_spanned_pages; \
> -})
> -
> #define kern_addr_valid(kaddr) virt_addr_valid((void *)kaddr)
>
> static inline int pfn_valid(int pfn)
> diff --git a/arch/x86/include/asm/mmzone_32.h b/arch/x86/include/asm/mmzone_32.h
> index 5e83a41..224e8c5 100644
> --- a/arch/x86/include/asm/mmzone_32.h
> +++ b/arch/x86/include/asm/mmzone_32.h
> @@ -48,17 +48,6 @@ static inline int pfn_to_nid(unsigned long pfn)
> #endif
> }
>
> -/*
> - * Following are macros that each numa implmentation must define.
> - */
> -
> -#define node_start_pfn(nid) (NODE_DATA(nid)->node_start_pfn)
> -#define node_end_pfn(nid) \
> -({ \
> - pg_data_t *__pgdat = NODE_DATA(nid); \
> - __pgdat->node_start_pfn + __pgdat->node_spanned_pages; \
> -})
> -
> static inline int pfn_valid(int pfn)
> {
> int nid = pfn_to_nid(pfn);
> diff --git a/arch/x86/include/asm/mmzone_64.h b/arch/x86/include/asm/mmzone_64.h
> index b3f88d7..129d9aa 100644
> --- a/arch/x86/include/asm/mmzone_64.h
> +++ b/arch/x86/include/asm/mmzone_64.h
> @@ -13,8 +13,5 @@ extern struct pglist_data *node_data[];
>
> #define NODE_DATA(nid) (node_data[nid])
>
> -#define node_start_pfn(nid) (NODE_DATA(nid)->node_start_pfn)
> -#define node_end_pfn(nid) (NODE_DATA(nid)->node_start_pfn + \
> - NODE_DATA(nid)->node_spanned_pages)
> #endif
> #endif /* _ASM_X86_MMZONE_64_H */
> diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
> index c928dac..9f7c3eb 100644
> --- a/include/linux/mmzone.h
> +++ b/include/linux/mmzone.h
> @@ -647,6 +647,13 @@ typedef struct pglist_data {
> #endif
> #define nid_page_nr(nid, pagenr) pgdat_page_nr(NODE_DATA(nid),(pagenr))
>
> +#define node_start_pfn(nid) (NODE_DATA(nid)->node_start_pfn)
> +
> +#define node_end_pfn(nid) ({\
> + pg_data_t *__pgdat = NODE_DATA(nid);\
> + __pgdat->node_start_pfn + __pgdat->node_spanned_pages;\
> +})
> +
> #include <linux/memory_hotplug.h>
>
> extern struct mutex zonelists_mutex;
--
~Randy
*** Remember to use Documentation/SubmitChecklist when testing your code ***
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