linux-kernel - [patch V3 15/20] x86/fpu/signal: Change return type of copy_fpregs_to

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Date:   Wed,  8 Sep 2021 15:29:34 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     x86@...nel.org, Al Viro <viro@...iv.linux.org.uk>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Tony Luck <tony.luck@...el.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Peter Ziljstra <peterz@...radead.org>,
        Song Liu <songliubraving@...com>,
        Daniel Borkmann <daniel@...earbox.net>
Subject: [patch V3 15/20] x86/fpu/signal: Change return type of
 copy_fpregs_to_sigframe() helpers to boolean

Now that copy_fpregs_to_sigframe() returns boolean the individual return
codes in the related helper functions do not make sense anymore. Change
them to return boolean success/fail.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 arch/x86/kernel/fpu/signal.c |   17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

--- a/arch/x86/kernel/fpu/signal.c
+++ b/arch/x86/kernel/fpu/signal.c
@@ -65,7 +65,7 @@ static inline int check_xstate_in_sigfra
 /*
  * Signal frame handlers.
  */
-static inline int save_fsave_header(struct task_struct *tsk, void __user *buf)
+static inline bool save_fsave_header(struct task_struct *tsk, void __user *buf)
 {
 	if (use_fxsr()) {
 		struct xregs_state *xsave = &tsk->thread.fpu.state.xsave;
@@ -82,18 +82,19 @@ static inline int save_fsave_header(stru
 		if (__copy_to_user(buf, &env, sizeof(env)) ||
 		    __put_user(xsave->i387.swd, &fp->status) ||
 		    __put_user(X86_FXSR_MAGIC, &fp->magic))
-			return -1;
+			return false;
 	} else {
 		struct fregs_state __user *fp = buf;
 		u32 swd;
+
 		if (__get_user(swd, &fp->swd) || __put_user(swd, &fp->status))
-			return -1;
+			return false;
 	}
 
-	return 0;
+	return true;
 }
 
-static inline int save_xstate_epilog(void __user *buf, int ia32_frame)
+static inline bool save_xstate_epilog(void __user *buf, int ia32_frame)
 {
 	struct xregs_state __user *x = buf;
 	struct _fpx_sw_bytes *sw_bytes;
@@ -131,7 +132,7 @@ static inline int save_xstate_epilog(voi
 
 	err |= __put_user(xfeatures, (__u32 __user *)&x->header.xfeatures);
 
-	return err;
+	return !err;
 }
 
 static inline int copy_fpregs_to_sigframe(struct xregs_state __user *buf)
@@ -219,10 +220,10 @@ bool copy_fpstate_to_sigframe(void __use
 	}
 
 	/* Save the fsave header for the 32-bit frames. */
-	if ((ia32_fxstate || !use_fxsr()) && save_fsave_header(tsk, buf))
+	if ((ia32_fxstate || !use_fxsr()) && !save_fsave_header(tsk, buf))
 		return false;
 
-	if (use_fxsr() && save_xstate_epilog(buf_fx, ia32_fxstate))
+	if (use_fxsr() && !save_xstate_epilog(buf_fx, ia32_fxstate))
 		return false;
 
 	return true;