openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

sparc32: make copy_to/from_user_page() usable from modular code 

While copy_to/from_user_page() users are uncommon, there is one in
drivers/staging/lustre/lustre/libcfs/linux/linux-curproc.c which leads
to the following:

ERROR: "sparc32_cachetlb_ops" [drivers/staging/lustre/lustre/libcfs/libcfs.ko] undefined!

during routine allmodconfig build coverage.  The reason this happens
is as follows:

In arch/sparc/include/asm/cacheflush_32.h we have:

 #define flush_cache_page(vma,addr,pfn) \
        sparc32_cachetlb_ops->cache_page(vma, addr)

 #define copy_to_user_page(vma, page, vaddr, dst, src, len) \
        do {                                                    \
                flush_cache_page(vma, vaddr, page_to_pfn(page));\
                memcpy(dst, src, len);                          \
        } while (0)
 #define copy_from_user_page(vma, page, vaddr, dst, src, len) \
        do {                                                    \
                flush_cache_page(vma, vaddr, page_to_pfn(page));\
                memcpy(dst, src, len);                          \
        } while (0)

However, sparc32_cachetlb_ops isn't exported and hence the error.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paul Gortmaker 2014-02-13 16:15:01 -05:00 committed by David S. Miller
parent 4f6500fff5
commit a56b072fa3
1 changed files with 2 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/sparc/mm/srmmu.c
View File

@ -14,6 +14,7 @@
#include <linux/pagemap.h> #include <linux/pagemap.h>
#include <linux/vmalloc.h> #include <linux/vmalloc.h>
#include <linux/kdebug.h> #include <linux/kdebug.h>
#include <linux/export.h>
#include <linux/kernel.h> #include <linux/kernel.h>
#include <linux/init.h> #include <linux/init.h>
#include <linux/log2.h> #include <linux/log2.h>
@ -62,6 +63,7 @@ extern unsigned long last_valid_pfn;
static pgd_t *srmmu_swapper_pg_dir; static pgd_t *srmmu_swapper_pg_dir;
const struct sparc32_cachetlb_ops *sparc32_cachetlb_ops; const struct sparc32_cachetlb_ops *sparc32_cachetlb_ops;
EXPORT_SYMBOL(sparc32_cachetlb_ops);
#ifdef CONFIG_SMP #ifdef CONFIG_SMP
const struct sparc32_cachetlb_ops *local_ops; const struct sparc32_cachetlb_ops *local_ops;