[PATCH 02/18] compat: Cleanup in_compat_syscall() callers

[Dmitry Safonov]

Now that in_compat_syscall() == false on native i686, it's possible to
remove some ifdeffery and no more needed helpers.

Cc: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>
Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
Cc: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: John Stultz <john.stultz@xxxxxxxxxx>
Cc: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Steffen Klassert <steffen.klassert@xxxxxxxxxxx>
Cc: Stephen Boyd <sboyd@xxxxxxxxxx>
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: x86@xxxxxxxxxx
Cc: linux-efi@xxxxxxxxxxxxxxx
Cc: netdev@xxxxxxxxxxxxxxx
Signed-off-by: Dmitry Safonov <dima@xxxxxxxxxx>
---
 drivers/firmware/efi/efivars.c | 16 ++++------------
 kernel/time/time.c             |  2 +-
 net/xfrm/xfrm_state.c          |  2 --
 net/xfrm/xfrm_user.c           |  2 --
 4 files changed, 5 insertions(+), 17 deletions(-)

diff --git a/drivers/firmware/efi/efivars.c b/drivers/firmware/efi/efivars.c
index 3e626fd9bd4e..8061667a6765 100644
--- a/drivers/firmware/efi/efivars.c
+++ b/drivers/firmware/efi/efivars.c
@@ -229,14 +229,6 @@ sanity_check(struct efi_variable *var, efi_char16_t *name, efi_guid_t vendor,
 	return 0;
 }
 
-static inline bool is_compat(void)
-{
-	if (IS_ENABLED(CONFIG_COMPAT) && in_compat_syscall())
-		return true;
-
-	return false;
-}
-
 static void
 copy_out_compat(struct efi_variable *dst, struct compat_efi_variable *src)
 {
@@ -263,7 +255,7 @@ efivar_store_raw(struct efivar_entry *entry, const char *buf, size_t count)
 	u8 *data;
 	int err;
 
-	if (is_compat()) {
+	if (in_compat_syscall()) {
 		struct compat_efi_variable *compat;
 
 		if (count != sizeof(*compat))
@@ -324,7 +316,7 @@ efivar_show_raw(struct efivar_entry *entry, char *buf)
 			     &entry->var.DataSize, entry->var.Data))
 		return -EIO;
 
-	if (is_compat()) {
+	if (in_compat_syscall()) {
 		compat = (struct compat_efi_variable *)buf;
 
 		size = sizeof(*compat);
@@ -418,7 +410,7 @@ static ssize_t efivar_create(struct file *filp, struct kobject *kobj,
 	struct compat_efi_variable *compat = (struct compat_efi_variable *)buf;
 	struct efi_variable *new_var = (struct efi_variable *)buf;
 	struct efivar_entry *new_entry;
-	bool need_compat = is_compat();
+	bool need_compat = in_compat_syscall();
 	efi_char16_t *name;
 	unsigned long size;
 	u32 attributes;
@@ -495,7 +487,7 @@ static ssize_t efivar_delete(struct file *filp, struct kobject *kobj,
 	if (!capable(CAP_SYS_ADMIN))
 		return -EACCES;
 
-	if (is_compat()) {
+	if (in_compat_syscall()) {
 		if (count != sizeof(*compat))
 			return -EINVAL;
 
diff --git a/kernel/time/time.c b/kernel/time/time.c
index 2b41e8e2d31d..d59caa6d03e6 100644
--- a/kernel/time/time.c
+++ b/kernel/time/time.c
@@ -865,7 +865,7 @@ int get_timespec64(struct timespec64 *ts,
 	ts->tv_sec = kts.tv_sec;
 
 	/* Zero out the padding for 32 bit systems or in compat mode */
-	if (IS_ENABLED(CONFIG_64BIT_TIME) && (!IS_ENABLED(CONFIG_64BIT) || in_compat_syscall()))
+	if (IS_ENABLED(CONFIG_64BIT_TIME) && in_compat_syscall())
 		kts.tv_nsec &= 0xFFFFFFFFUL;
 
 	ts->tv_nsec = kts.tv_nsec;
diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c
index 8308281f3253..3f48a6925606 100644
--- a/net/xfrm/xfrm_state.c
+++ b/net/xfrm/xfrm_state.c
@@ -2057,10 +2057,8 @@ int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen
 	struct xfrm_mgr *km;
 	struct xfrm_policy *pol = NULL;
 
-#ifdef CONFIG_COMPAT
 	if (in_compat_syscall())
 		return -EOPNOTSUPP;
-#endif
 
 	if (!optval && !optlen) {
 		xfrm_sk_policy_insert(sk, XFRM_POLICY_IN, NULL);
diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
index 080035f056d9..2677cb55b7a8 100644
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -2546,10 +2546,8 @@ static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
 	const struct xfrm_link *link;
 	int type, err;
 
-#ifdef CONFIG_COMPAT
 	if (in_compat_syscall())
 		return -EOPNOTSUPP;
-#endif
 
 	type = nlh->nlmsg_type;
 	if (type > XFRM_MSG_MAX)
-- 
2.13.6