From: Peng Tao <peng_tao@emc.com>
Date: Tue, 24 Jan 2012 05:00:30 +0000 (+0800)
Subject: LU-709 build: clean up LC_FUNC_GRAB_CACHE_PAGE_NOWAIT_GFP
X-Git-Tag: 2.2.51~25
X-Git-Url: https://git.whamcloud.com/?p=fs%2Flustre-release.git;a=commitdiff_plain;h=8f2dbe8765d585895eabdfe0646ed0794c057426;ds=sidebyside

LU-709 build: clean up LC_FUNC_GRAB_CACHE_PAGE_NOWAIT_GFP

grab_cache_page_nowait_gfp does not exist from v2.6.18 to
latest kernel. HAVE_ADD_TO_PAGE_CACHE_LRU is checked twice

Signed-off-by: Peng Tao <peng_tao@emc.com>
Change-Id: I95b8ba91b357c5803613927fce41804f1ad6adf8
Reviewed-on: http://review.whamcloud.com/2326
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
---

diff --git a/lustre/autoconf/lustre-core.m4 b/lustre/autoconf/lustre-core.m4
index e855aea..3181183 100644
--- a/lustre/autoconf/lustre-core.m4
+++ b/lustre/autoconf/lustre-core.m4
@@ -307,27 +307,6 @@ AC_DEFUN([LC_EXPORT_NODE_TO_CPUMASK],
           ])
 
 #
-# LC_FUNC_GRAB_CACHE_PAGE_NOWAIT_GFP
-#
-# Check for our patched grab_cache_page_nowait_gfp() function
-# after 2.6.29 we can emulate this using add_to_page_cache_lru()
-#
-AC_DEFUN([LC_FUNC_GRAB_CACHE_PAGE_NOWAIT_GFP],
-[LB_CHECK_SYMBOL_EXPORT([grab_cache_page_nowait_gfp],
-[mm/filemap.c],[
-        AC_DEFINE(HAVE_GRAB_CACHE_PAGE_NOWAIT_GFP, 1,
-                  [kernel exports grab_cache_page_nowait_gfp])
-        ],
-        [LB_CHECK_SYMBOL_EXPORT([add_to_page_cache_lru],
-        [mm/filemap.c],[
-                AC_DEFINE(HAVE_ADD_TO_PAGE_CACHE_LRU, 1,
-                        [kernel exports add_to_page_cache_lru])
-        ],[
-        ])
-        ])
-])
-
-#
 #
 # between 2.6.5 - 2.6.22 filemap_populate is exported in some kernels
 #
@@ -1934,6 +1913,7 @@ AC_DEFUN([LC_SET_CPUS_ALLOWED],
 # LC_D_OBTAIN_ALIAS
 # starting from 2.6.28 kernel replaces d_alloc_anon() with
 # d_obtain_alias() for getting anonymous dentries
+# RHEL5(2.6.18) has d_obtain_alias but SLES11SP0(2.6.27) not
 #
 AC_DEFUN([LC_D_OBTAIN_ALIAS],
 [AC_MSG_CHECKING([d_obtain_alias exist in kernel])
@@ -2145,7 +2125,6 @@ AC_DEFUN([LC_PROG_LINUX],
          LC_EXPORT___D_REHASH
          LC_EXPORT_NODE_TO_CPUMASK
 
-         LC_FUNC_GRAB_CACHE_PAGE_NOWAIT_GFP
          LC_FILEMAP_POPULATE
          LC_BIT_SPINLOCK_H
 
@@ -2170,7 +2149,6 @@ AC_DEFUN([LC_PROG_LINUX],
 
          # 2.6.12
          LC_RW_TREE_LOCK
-         LC_EXPORT_SYNCHRONIZE_RCU
 
          # 2.6.15
          LC_INODE_I_MUTEX
@@ -2525,6 +2503,7 @@ if test x$enable_split != xno; then
 fi
 ])
 
+# RHEL5(2.6.18) has tux_info
 AC_DEFUN([LC_TASK_CLENV_TUX_INFO],
 [AC_MSG_CHECKING([tux_info])
 LB_LINUX_TRY_COMPILE([
diff --git a/lustre/include/linux/lustre_compat25.h b/lustre/include/linux/lustre_compat25.h
index b0686f7..d2939b5 100644
--- a/lustre/include/linux/lustre_compat25.h
+++ b/lustre/include/linux/lustre_compat25.h
@@ -346,10 +346,6 @@ static inline int mapping_has_pages(struct address_space *mapping)
 #define DOWN_READ_I_ALLOC_SEM(i)  down_read(&(i)->i_alloc_sem)
 #define LASSERT_I_ALLOC_SEM_READ_LOCKED(i) LASSERT(down_write_trylock(&(i)->i_alloc_sem) == 0)
 
-#ifndef HAVE_GRAB_CACHE_PAGE_NOWAIT_GFP
-#define grab_cache_page_nowait_gfp(x, y, z) grab_cache_page_nowait((x), (y))
-#endif
-
 #include <linux/mpage.h>        /* for generic_writepages */
 #ifndef HAVE_FILEMAP_FDATAWRITE_RANGE
 #include <linux/backing-dev.h>  /* for mapping->backing_dev_info */
diff --git a/lustre/llite/rw.c b/lustre/llite/rw.c
index 4e900af..fee99b3 100644
--- a/lustre/llite/rw.c
+++ b/lustre/llite/rw.c
@@ -541,7 +541,7 @@ static int ll_read_ahead_page(const struct lu_env *env, struct cl_io *io,
 #ifdef __GFP_NOWARN
         gfp_mask |= __GFP_NOWARN;
 #endif
-        vmpage = grab_cache_page_nowait_gfp(mapping, index, gfp_mask);
+        vmpage = grab_cache_page_nowait(mapping, index);
         if (vmpage != NULL) {
                 /* Check if vmpage was truncated or reclaimed */
                 if (vmpage->mapping == mapping) {