linux-kernel - [tip: x86/fpu] x86/fpu/signal: Change return type of fpu__restore

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Date:   Tue, 14 Sep 2021 19:19:26 -0000
From:   "tip-bot2 for Thomas Gleixner" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Al Viro <viro@...iv.linux.org.uk>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...e.de>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: x86/fpu] x86/fpu/signal: Change return type of
 fpu__restore_sig() to boolean

The following commit has been merged into the x86/fpu branch of tip:

Commit-ID:     f3305be5feecae62adfa5a6a1441a76493fe7412
Gitweb:        https://git.kernel.org/tip/f3305be5feecae62adfa5a6a1441a76493fe7412
Author:        Thomas Gleixner <tglx@...utronix.de>
AuthorDate:    Wed, 08 Sep 2021 15:29:37 +02:00
Committer:     Borislav Petkov <bp@...e.de>
CommitterDate: Tue, 14 Sep 2021 21:10:03 +02:00

x86/fpu/signal: Change return type of fpu__restore_sig() to boolean

None of the call sites cares about the error code. All they need to know is
whether the function succeeded or not.

Suggested-by: Al Viro <viro@...iv.linux.org.uk>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Borislav Petkov <bp@...e.de>
Link: https://lkml.kernel.org/r/20210908132525.909065931@linutronix.de
---
 arch/x86/ia32/ia32_signal.c         |  2 +-
 arch/x86/include/asm/fpu/internal.h |  2 +-
 arch/x86/kernel/fpu/signal.c        | 22 ++++++++++------------
 arch/x86/kernel/signal.c            |  4 ++--
 4 files changed, 14 insertions(+), 16 deletions(-)

diff --git a/arch/x86/ia32/ia32_signal.c b/arch/x86/ia32/ia32_signal.c
index 0d6789b..828ab0a 100644
--- a/arch/x86/ia32/ia32_signal.c
+++ b/arch/x86/ia32/ia32_signal.c
@@ -94,7 +94,7 @@ static bool ia32_restore_sigcontext(struct pt_regs *regs,
 	 * normal case.
 	 */
 	reload_segments(&sc);
-	return !fpu__restore_sig(compat_ptr(sc.fpstate), 1);
+	return fpu__restore_sig(compat_ptr(sc.fpstate), 1);
 }
 
 COMPAT_SYSCALL_DEFINE0(sigreturn)
diff --git a/arch/x86/include/asm/fpu/internal.h b/arch/x86/include/asm/fpu/internal.h
index 74aa53e..89960e4 100644
--- a/arch/x86/include/asm/fpu/internal.h
+++ b/arch/x86/include/asm/fpu/internal.h
@@ -26,7 +26,7 @@
 /*
  * High level FPU state handling functions:
  */
-extern int  fpu__restore_sig(void __user *buf, int ia32_frame);
+extern bool fpu__restore_sig(void __user *buf, int ia32_frame);
 extern void fpu__drop(struct fpu *fpu);
 extern void fpu__clear_user_states(struct fpu *fpu);
 extern int  fpu__exception_code(struct fpu *fpu, int trap_nr);
diff --git a/arch/x86/kernel/fpu/signal.c b/arch/x86/kernel/fpu/signal.c
index 1d10fe9..d418d28 100644
--- a/arch/x86/kernel/fpu/signal.c
+++ b/arch/x86/kernel/fpu/signal.c
@@ -433,17 +433,17 @@ static inline int xstate_sigframe_size(void)
 /*
  * Restore FPU state from a sigframe:
  */
-int fpu__restore_sig(void __user *buf, int ia32_frame)
+bool fpu__restore_sig(void __user *buf, int ia32_frame)
 {
 	unsigned int size = xstate_sigframe_size();
 	struct fpu *fpu = &current->thread.fpu;
 	void __user *buf_fx = buf;
 	bool ia32_fxstate = false;
-	int ret;
+	bool success = false;
 
 	if (unlikely(!buf)) {
 		fpu__clear_user_states(fpu);
-		return 0;
+		return true;
 	}
 
 	ia32_frame &= (IS_ENABLED(CONFIG_X86_32) ||
@@ -459,23 +459,21 @@ int fpu__restore_sig(void __user *buf, int ia32_frame)
 		ia32_fxstate = true;
 	}
 
-	if (!access_ok(buf, size)) {
-		ret = -EACCES;
+	if (!access_ok(buf, size))
 		goto out;
-	}
 
 	if (!IS_ENABLED(CONFIG_X86_64) && !cpu_feature_enabled(X86_FEATURE_FPU)) {
-		ret = fpregs_soft_set(current, NULL, 0,
-				      sizeof(struct user_i387_ia32_struct),
-				      NULL, buf);
+		success = !fpregs_soft_set(current, NULL, 0,
+					   sizeof(struct user_i387_ia32_struct),
+					   NULL, buf);
 	} else {
-		ret = __fpu_restore_sig(buf, buf_fx, ia32_fxstate);
+		success = !__fpu_restore_sig(buf, buf_fx, ia32_fxstate);
 	}
 
 out:
-	if (unlikely(ret))
+	if (unlikely(!success))
 		fpu__clear_user_states(fpu);
-	return ret;
+	return success;
 }
 
 unsigned long
diff --git a/arch/x86/kernel/signal.c b/arch/x86/kernel/signal.c
index 140b7b2..02ee68e 100644
--- a/arch/x86/kernel/signal.c
+++ b/arch/x86/kernel/signal.c
@@ -136,8 +136,8 @@ static bool restore_sigcontext(struct pt_regs *regs,
 		force_valid_ss(regs);
 #endif
 
-	return !fpu__restore_sig((void __user *)sc.fpstate,
-				 IS_ENABLED(CONFIG_X86_32));
+	return fpu__restore_sig((void __user *)sc.fpstate,
+			       IS_ENABLED(CONFIG_X86_32));
 }
 
 static __always_inline int