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Date: Tue, 26 Sep 2017 01:23:04 -0700
From: tip-bot for Ingo Molnar <tipbot@...or.com>
To: linux-tip-commits@...r.kernel.org
Cc: luto@...nel.org, luto@...capital.net, hpa@...or.com,
peterz@...radead.org, akpm@...ux-foundation.org,
ebiggers3@...il.com, tglx@...utronix.de,
dave.hansen@...ux.intel.com, linux-kernel@...r.kernel.org,
mingo@...nel.org, bp@...en8.de, yu-cheng.yu@...el.com,
fenghua.yu@...el.com, torvalds@...ux-foundation.org,
oleg@...hat.com, riel@...hat.com
Subject: [tip:x86/fpu] x86/fpu: Remove 'kbuf' parameter from the
copy_xstate_to_user() APIs
Commit-ID: a69c158fb3e7a91220f55029bf222a4e678d16e9
Gitweb: http://git.kernel.org/tip/a69c158fb3e7a91220f55029bf222a4e678d16e9
Author: Ingo Molnar <mingo@...nel.org>
AuthorDate: Sat, 23 Sep 2017 14:59:47 +0200
Committer: Ingo Molnar <mingo@...nel.org>
CommitDate: Sun, 24 Sep 2017 13:04:31 +0200
x86/fpu: Remove 'kbuf' parameter from the copy_xstate_to_user() APIs
The 'kbuf' parameter is unused in the _user() side of the API, remove it.
This simplifies the code and makes it easier to think about.
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Andy Lutomirski <luto@...capital.net>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Dave Hansen <dave.hansen@...ux.intel.com>
Cc: Eric Biggers <ebiggers3@...il.com>
Cc: Fenghua Yu <fenghua.yu@...el.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Oleg Nesterov <oleg@...hat.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Rik van Riel <riel@...hat.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Yu-cheng Yu <yu-cheng.yu@...el.com>
Link: http://lkml.kernel.org/r/20170923130016.21448-5-mingo@kernel.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
arch/x86/include/asm/fpu/xstate.h | 2 +-
arch/x86/kernel/fpu/regset.c | 2 +-
arch/x86/kernel/fpu/xstate.c | 25 +++++++------------------
3 files changed, 9 insertions(+), 20 deletions(-)
diff --git a/arch/x86/include/asm/fpu/xstate.h b/arch/x86/include/asm/fpu/xstate.h
index c762574..65bd68c3 100644
--- a/arch/x86/include/asm/fpu/xstate.h
+++ b/arch/x86/include/asm/fpu/xstate.h
@@ -49,7 +49,7 @@ void *get_xsave_addr(struct xregs_state *xsave, int xstate);
const void *get_xsave_field_ptr(int xstate_field);
int using_compacted_format(void);
int copy_xstate_to_kernel(unsigned int pos, unsigned int count, void *kbuf, struct xregs_state *xsave);
-int copy_xstate_to_user(unsigned int pos, unsigned int count, void *kbuf, void __user *ubuf, struct xregs_state *xsave);
+int copy_xstate_to_user(unsigned int pos, unsigned int count, void __user *ubuf, struct xregs_state *xsave);
int copy_user_to_xstate(const void *kbuf, const void __user *ubuf,
struct xregs_state *xsave);
#endif
diff --git a/arch/x86/kernel/fpu/regset.c b/arch/x86/kernel/fpu/regset.c
index 34e74ad..fd6dbdd 100644
--- a/arch/x86/kernel/fpu/regset.c
+++ b/arch/x86/kernel/fpu/regset.c
@@ -95,7 +95,7 @@ int xstateregs_get(struct task_struct *target, const struct user_regset *regset,
if (kbuf)
ret = copy_xstate_to_kernel(pos, count, kbuf, xsave);
else
- ret = copy_xstate_to_user(pos, count, kbuf, ubuf, xsave);
+ ret = copy_xstate_to_user(pos, count, ubuf, xsave);
} else {
fpstate_sanitize_xstate(fpu);
/*
diff --git a/arch/x86/kernel/fpu/xstate.c b/arch/x86/kernel/fpu/xstate.c
index 71d3bda..2d8f334 100644
--- a/arch/x86/kernel/fpu/xstate.c
+++ b/arch/x86/kernel/fpu/xstate.c
@@ -1011,10 +1011,7 @@ int copy_xstate_to_kernel(unsigned int pos, unsigned int count, void *kbuf, stru
}
static inline int
-__copy_xstate_to_user(unsigned int pos, unsigned int count,
- void *kbuf, void __user *ubuf,
- const void *data, const int start_pos,
- const int end_pos)
+__copy_xstate_to_user(unsigned int pos, unsigned int count, void __user *ubuf, const void *data, const int start_pos, const int end_pos)
{
if ((count == 0) || (pos < start_pos))
return 0;
@@ -1022,12 +1019,8 @@ __copy_xstate_to_user(unsigned int pos, unsigned int count,
if (end_pos < 0 || pos < end_pos) {
unsigned int copy = (end_pos < 0 ? count : min(count, end_pos - pos));
- if (kbuf) {
- memcpy(kbuf + pos, data, copy);
- } else {
- if (__copy_to_user(ubuf + pos, data, copy))
- return -EFAULT;
- }
+ if (__copy_to_user(ubuf + pos, data, copy))
+ return -EFAULT;
}
return 0;
}
@@ -1038,8 +1031,7 @@ __copy_xstate_to_user(unsigned int pos, unsigned int count,
* zero. This is called from xstateregs_get() and there we check the CPU
* has XSAVES.
*/
-int copy_xstate_to_user(unsigned int pos, unsigned int count, void *kbuf,
- void __user *ubuf, struct xregs_state *xsave)
+int copy_xstate_to_user(unsigned int pos, unsigned int count, void __user *ubuf, struct xregs_state *xsave)
{
unsigned int offset, size;
int ret, i;
@@ -1064,8 +1056,7 @@ int copy_xstate_to_user(unsigned int pos, unsigned int count, void *kbuf,
offset = offsetof(struct xregs_state, header);
size = sizeof(header);
- ret = __copy_xstate_to_user(offset, size, kbuf, ubuf, &header, 0, count);
-
+ ret = __copy_xstate_to_user(offset, size, ubuf, &header, 0, count);
if (ret)
return ret;
@@ -1079,8 +1070,7 @@ int copy_xstate_to_user(unsigned int pos, unsigned int count, void *kbuf,
offset = xstate_offsets[i];
size = xstate_sizes[i];
- ret = __copy_xstate_to_user(offset, size, kbuf, ubuf, src, 0, count);
-
+ ret = __copy_xstate_to_user(offset, size, ubuf, src, 0, count);
if (ret)
return ret;
@@ -1096,8 +1086,7 @@ int copy_xstate_to_user(unsigned int pos, unsigned int count, void *kbuf,
offset = offsetof(struct fxregs_state, sw_reserved);
size = sizeof(xstate_fx_sw_bytes);
- ret = __copy_xstate_to_user(offset, size, kbuf, ubuf, xstate_fx_sw_bytes, 0, count);
-
+ ret = __copy_xstate_to_user(offset, size, ubuf, xstate_fx_sw_bytes, 0, count);
if (ret)
return ret;
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