[PATCH -next v2] powerpc/mm: ptdump: Convert to DEFINE_SHOW_ATTRIBUTE

[Qinglang Miao]

Use DEFINE_SHOW_ATTRIBUTE macro to simplify the code.

Signed-off-by: Qinglang Miao <miaoqingl...@huawei.com>
---
v2: based on linux-next(20200917), and can be applied to
    mainline cleanly now.

 arch/powerpc/mm/ptdump/bats.c          | 24 +++++++-----------------
 arch/powerpc/mm/ptdump/hashpagetable.c | 12 +-----------
 arch/powerpc/mm/ptdump/ptdump.c        | 13 +------------
 arch/powerpc/mm/ptdump/segment_regs.c  | 12 +-----------
 4 files changed, 10 insertions(+), 51 deletions(-)

diff --git a/arch/powerpc/mm/ptdump/bats.c b/arch/powerpc/mm/ptdump/bats.c
index e29b338d4..a24495e93 100644
--- a/arch/powerpc/mm/ptdump/bats.c
+++ b/arch/powerpc/mm/ptdump/bats.c
@@ -56,7 +56,7 @@ static void bat_show_601(struct seq_file *m, int idx, u32 
lower, u32 upper)
 
 #define BAT_SHOW_601(_m, _n, _l, _u) bat_show_601(_m, _n, mfspr(_l), mfspr(_u))
 
-static int bats_show_601(struct seq_file *m, void *v)
+static int bats_601_show(struct seq_file *m, void *v)
 {
        seq_puts(m, "---[ Block Address Translation ]---\n");
 
@@ -113,7 +113,7 @@ static void bat_show_603(struct seq_file *m, int idx, u32 
lower, u32 upper, bool
 
 #define BAT_SHOW_603(_m, _n, _l, _u, _d) bat_show_603(_m, _n, mfspr(_l), 
mfspr(_u), _d)
 
-static int bats_show_603(struct seq_file *m, void *v)
+static int bats_603_show(struct seq_file *m, void *v)
 {
        seq_puts(m, "---[ Instruction Block Address Translation ]---\n");
 
@@ -144,25 +144,15 @@ static int bats_show_603(struct seq_file *m, void *v)
        return 0;
 }
 
-static int bats_open(struct inode *inode, struct file *file)
-{
-       if (IS_ENABLED(CONFIG_PPC_BOOK3S_601))
-               return single_open(file, bats_show_601, NULL);
-
-       return single_open(file, bats_show_603, NULL);
-}
-
-static const struct file_operations bats_fops = {
-       .open           = bats_open,
-       .read           = seq_read,
-       .llseek         = seq_lseek,
-       .release        = single_release,
-};
+DEFINE_SHOW_ATTRIBUTE(bats_601);
+DEFINE_SHOW_ATTRIBUTE(bats_603);
 
 static int __init bats_init(void)
 {
        debugfs_create_file("block_address_translation", 0400,
-                           powerpc_debugfs_root, NULL, &bats_fops);
+                           powerpc_debugfs_root, NULL,
+                           IS_ENABLED(CONFIG_PPC_BOOK3S_601) ?
+                           &bats_601_fops : & bats_603_fops);
        return 0;
 }
 device_initcall(bats_init);
diff --git a/arch/powerpc/mm/ptdump/hashpagetable.c 
b/arch/powerpc/mm/ptdump/hashpagetable.c
index ad6df9a2e..c7f824d29 100644
--- a/arch/powerpc/mm/ptdump/hashpagetable.c
+++ b/arch/powerpc/mm/ptdump/hashpagetable.c
@@ -526,17 +526,7 @@ static int ptdump_show(struct seq_file *m, void *v)
        return 0;
 }
 
-static int ptdump_open(struct inode *inode, struct file *file)
-{
-       return single_open(file, ptdump_show, NULL);
-}
-
-static const struct file_operations ptdump_fops = {
-       .open           = ptdump_open,
-       .read           = seq_read,
-       .llseek         = seq_lseek,
-       .release        = single_release,
-};
+DEFINE_SHOW_ATTRIBUTE(ptdump);
 
 static int ptdump_init(void)
 {
diff --git a/arch/powerpc/mm/ptdump/ptdump.c b/arch/powerpc/mm/ptdump/ptdump.c
index aca354fb6..6bbf85ff2 100644
--- a/arch/powerpc/mm/ptdump/ptdump.c
+++ b/arch/powerpc/mm/ptdump/ptdump.c
@@ -413,18 +413,7 @@ static int ptdump_show(struct seq_file *m, void *v)
        return 0;
 }
 
-
-static int ptdump_open(struct inode *inode, struct file *file)
-{
-       return single_open(file, ptdump_show, NULL);
-}
-
-static const struct file_operations ptdump_fops = {
-       .open           = ptdump_open,
-       .read           = seq_read,
-       .llseek         = seq_lseek,
-       .release        = single_release,
-};
+DEFINE_SHOW_ATTRIBUTE(ptdump);
 
 static void build_pgtable_complete_mask(void)
 {
diff --git a/arch/powerpc/mm/ptdump/segment_regs.c 
b/arch/powerpc/mm/ptdump/segment_regs.c
index dde2fe8de..9e870d44c 100644
--- a/arch/powerpc/mm/ptdump/segment_regs.c
+++ b/arch/powerpc/mm/ptdump/segment_regs.c
@@ -41,17 +41,7 @@ static int sr_show(struct seq_file *m, void *v)
        return 0;
 }
 
-static int sr_open(struct inode *inode, struct file *file)
-{
-       return single_open(file, sr_show, NULL);
-}
-
-static const struct file_operations sr_fops = {
-       .open           = sr_open,
-       .read           = seq_read,
-       .llseek         = seq_lseek,
-       .release        = single_release,
-};
+DEFINE_SHOW_ATTRIBUTE(sr);
 
 static int __init sr_init(void)
 {
-- 
2.23.0