From: Ingo Molnar <mingo@kernel.org>
To: linux-kernel@vger.kernel.org
Cc: Andrew Morton <akpm@linux-foundation.org>,
Andy Lutomirski <luto@amacapital.net>,
Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
Fenghua Yu <fenghua.yu@intel.com>,
"H . Peter Anvin" <hpa@zytor.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Oleg Nesterov <oleg@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
Rik van Riel <riel@redhat.com>,
Thomas Gleixner <tglx@linutronix.de>,
Yu-cheng Yu <yu-cheng.yu@intel.com>
Subject: [PATCH 04/14] x86/fpu: Remove 'kbuf' parameter from the copy_xstate_to_user() APIs
Date: Thu, 26 Jan 2017 11:22:49 +0100 [thread overview]
Message-ID: <1485426179-13681-5-git-send-email-mingo@kernel.org> (raw)
In-Reply-To: <1485426179-13681-1-git-send-email-mingo@kernel.org>
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: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Signed-off-by: Ingo Molnar <mingo@kernel.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 c762574a245f..65bd68c30cd0 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 a5f2b38a47dc..62a2d1154e45 100644
--- a/arch/x86/kernel/fpu/regset.c
+++ b/arch/x86/kernel/fpu/regset.c
@@ -94,7 +94,7 @@ 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 6ac8e4a759ff..1ac3d2ae73e6 100644
--- a/arch/x86/kernel/fpu/xstate.c
+++ b/arch/x86/kernel/fpu/xstate.c
@@ -1010,10 +1010,7 @@ 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;
@@ -1021,12 +1018,8 @@ __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;
}
@@ -1037,8 +1030,7 @@ __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;
@@ -1063,8 +1055,7 @@ 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;
@@ -1078,8 +1069,7 @@ 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;
@@ -1095,8 +1085,7 @@ 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;
--
2.7.4
next prev parent reply other threads:[~2017-01-26 10:24 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-26 10:22 [PATCH 00/14] x86/fpu: Clean up ptrace copying functions Ingo Molnar
2017-01-26 10:22 ` [PATCH 01/14] x86/fpu: Rename copyin_to_xsaves()/copyout_from_xsaves() to copy_user_to_xstate()/copy_xstate_to_user() Ingo Molnar
2017-01-26 10:22 ` [PATCH 02/14] x86/fpu: Split copy_xstate_to_user() into copy_xstate_to_kernel() & copy_xstate_to_user() Ingo Molnar
2017-01-26 10:22 ` [PATCH 03/14] x86/fpu: Remove 'ubuf' parameter from the copy_xstate_to_kernel() APIs Ingo Molnar
2017-01-26 10:22 ` Ingo Molnar [this message]
2017-01-27 10:16 ` [PATCH 04/14] x86/fpu: Remove 'kbuf' parameter from the copy_xstate_to_user() APIs Borislav Petkov
2017-01-30 9:57 ` Ingo Molnar
2017-01-30 15:45 ` Borislav Petkov
2017-01-30 17:23 ` Yu-cheng Yu
2017-01-26 10:22 ` [PATCH 05/14] x86/fpu: Clean up parameter order in the copy_xstate_to_*() APIs Ingo Molnar
2017-01-26 10:22 ` [PATCH 06/14] x86/fpu: Clean up the parameter definitions of copy_xstate_to_*() Ingo Molnar
2017-01-26 10:22 ` [PATCH 07/14] x86/fpu: Remove the 'start_pos' parameter from the __copy_xstate_to_*() functions Ingo Molnar
2017-01-26 10:22 ` [PATCH 08/14] x86/fpu: Clarify parameter names in the copy_xstate_to_*() methods Ingo Molnar
2017-01-26 10:22 ` [PATCH 09/14] x86/fpu: Change 'size_total' parameter to unsigned and standardize the size checks in copy_xstate_to_*() Ingo Molnar
2017-01-30 17:11 ` Yu-cheng Yu
2017-01-26 10:22 ` [PATCH 10/14] x86/fpu: Simplify __copy_xstate_to_kernel() return values Ingo Molnar
2017-01-26 10:22 ` [PATCH 11/14] x86/fpu: Split copy_user_to_xstate() into copy_kernel_to_xstate() & copy_user_to_xstate() Ingo Molnar
2017-01-27 10:54 ` Borislav Petkov
2017-01-26 10:22 ` [PATCH 12/14] x86/fpu: Remove 'ubuf' parameter from the copy_kernel_to_xstate() API Ingo Molnar
2017-01-26 10:22 ` [PATCH 13/14] x86/fpu: Remove 'kbuf' parameter from the copy_user_to_xstate() API Ingo Molnar
2017-01-26 10:22 ` [PATCH 14/14] x86/fpu: Flip the parameter order in copy_*_to_xstate() Ingo Molnar
2017-01-26 10:28 ` [PATCH 00/14] x86/fpu: Clean up ptrace copying functions Ingo Molnar
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