linux-kernel - [tip:x86/urgent] compat: Cleanup in_compat

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Date:   Thu, 1 Nov 2018 05:07:27 -0700
From:   tip-bot for Dmitry Safonov <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, luto@...nel.org,
        steffen.klassert@...unet.com, davem@...emloft.net, dima@...sta.com,
        rostedt@...dmis.org, hpa@...or.com,
        kirill.shutemov@...ux.intel.com, herbert@...dor.apana.org.au,
        sboyd@...nel.org, 0x7f454c46@...il.com, oleg@...hat.com,
        tglx@...utronix.de, mingo@...nel.org, john.stultz@...aro.org,
        ard.biesheuvel@...aro.org
Subject: [tip:x86/urgent] compat: Cleanup in_compat_syscall() callers

Commit-ID:  98f76206b33504b934209d16196477dfa519a807
Gitweb:     https://git.kernel.org/tip/98f76206b33504b934209d16196477dfa519a807
Author:     Dmitry Safonov <dima@...sta.com>
AuthorDate: Fri, 12 Oct 2018 14:42:53 +0100
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Thu, 1 Nov 2018 13:02:21 +0100

compat: Cleanup in_compat_syscall() callers

Now that in_compat_syscall() is consistent on all architectures and does
not longer report true on native i686, the workarounds (ifdeffery and
helpers) can be removed.

Signed-off-by: Dmitry Safonov <dima@...sta.com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Cc: Dmitry Safonov <0x7f454c46@...il.com>
Cc: Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc: Andy Lutomirsky <luto@...nel.org>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: Herbert Xu <herbert@...dor.apana.org.au>
Cc: "H. Peter Anvin" <hpa@...or.com>
Cc: John Stultz <john.stultz@...aro.org>
Cc: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc: Oleg Nesterov <oleg@...hat.com>
Cc: Steffen Klassert <steffen.klassert@...unet.com>
Cc: Stephen Boyd <sboyd@...nel.org>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: linux-efi@...r.kernel.org
Cc: netdev@...r.kernel.org
Link: https://lkml.kernel.org/r/20181012134253.23266-3-dima@arista.com

---
 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 e3a7f7fd3abc..ad204cf6d001 100644
--- a/kernel/time/time.c
+++ b/kernel/time/time.c
@@ -842,7 +842,7 @@ 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 b669262682c9..dc4a9f1fb941 100644
--- a/net/xfrm/xfrm_state.c
+++ b/net/xfrm/xfrm_state.c
@@ -2077,10 +2077,8 @@ 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 ca7a207b81a9..c9a84e22f5d5 100644
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -2621,10 +2621,8 @@ 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)