linux-kernel - [PATCH 10/14] x86/fpu: Simplify __copy_xstate_to

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Date:   Thu, 26 Jan 2017 11:22:55 +0100
From:   Ingo Molnar <mingo@...nel.org>
To:     linux-kernel@...r.kernel.org
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Andy Lutomirski <luto@...capital.net>,
        Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        "H . Peter Anvin" <hpa@...or.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Oleg Nesterov <oleg@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Rik van Riel <riel@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Yu-cheng Yu <yu-cheng.yu@...el.com>
Subject: [PATCH 10/14] x86/fpu: Simplify __copy_xstate_to_kernel() return values

__copy_xstate_to_kernel() can only return 0 (because kernel copies cannot fail),
simplify the code throughout.

No change in functionality.

Cc: Andy Lutomirski <luto@...nel.org>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Dave Hansen <dave.hansen@...ux.intel.com>
Cc: Fenghua Yu <fenghua.yu@...el.com>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Oleg Nesterov <oleg@...hat.com>
Cc: Rik van Riel <riel@...hat.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Yu-cheng Yu <yu-cheng.yu@...el.com>
Cc: Fenghua Yu <fenghua.yu@...el.com>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/kernel/fpu/xstate.c | 17 +++++------------
 1 file changed, 5 insertions(+), 12 deletions(-)

diff --git a/arch/x86/kernel/fpu/xstate.c b/arch/x86/kernel/fpu/xstate.c
index cceabca485c8..7d24fe305d4b 100644
--- a/arch/x86/kernel/fpu/xstate.c
+++ b/arch/x86/kernel/fpu/xstate.c
@@ -923,7 +923,7 @@ int arch_set_user_pkey_access(struct task_struct *tsk, int pkey,
  * This is similar to user_regset_copyout(), but will not add offset to
  * the source data pointer or increment pos, count, kbuf, and ubuf.
  */
-static inline int
+static inline void
 __copy_xstate_to_kernel(void *kbuf, const void *data,
 			unsigned int offset, unsigned int size, unsigned int size_total)
 {
@@ -932,7 +932,6 @@ __copy_xstate_to_kernel(void *kbuf, const void *data,
 
 		memcpy(kbuf + offset, data, copy);
 	}
-	return 0;
 }
 
 /*
@@ -945,8 +944,8 @@ __copy_xstate_to_kernel(void *kbuf, const void *data,
 int copy_xstate_to_kernel(void *kbuf, struct xregs_state *xsave, unsigned int offset_start, unsigned int size_total)
 {
 	unsigned int offset, size;
-	int ret, i;
 	struct xstate_header header;
+	int i;
 
 	/*
 	 * Currently copy_regset_to_user() starts from pos 0:
@@ -967,9 +966,7 @@ int copy_xstate_to_kernel(void *kbuf, struct xregs_state *xsave, unsigned int of
 	offset = offsetof(struct xregs_state, header);
 	size = sizeof(header);
 
-	ret = __copy_xstate_to_kernel(kbuf, &header, offset, size, size_total);
-	if (ret)
-		return ret;
+	__copy_xstate_to_kernel(kbuf, &header, offset, size, size_total);
 
 	for (i = 0; i < XFEATURE_MAX; i++) {
 		/*
@@ -985,9 +982,7 @@ int copy_xstate_to_kernel(void *kbuf, struct xregs_state *xsave, unsigned int of
 			if (offset + size > size_total)
 				break;
 
-			ret = __copy_xstate_to_kernel(kbuf, src, offset, size, size_total);
-			if (ret)
-				return ret;
+			__copy_xstate_to_kernel(kbuf, src, offset, size, size_total);
 		}
 
 	}
@@ -998,9 +993,7 @@ int copy_xstate_to_kernel(void *kbuf, struct xregs_state *xsave, unsigned int of
 	offset = offsetof(struct fxregs_state, sw_reserved);
 	size = sizeof(xstate_fx_sw_bytes);
 
-	ret = __copy_xstate_to_kernel(kbuf, xstate_fx_sw_bytes, offset, size, size_total);
-	if (ret)
-		return ret;
+	__copy_xstate_to_kernel(kbuf, xstate_fx_sw_bytes, offset, size, size_total);
 
 	return 0;
 }
-- 
2.7.4