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Subject[tip:x86/fpu] x86/fpu: Remove the 'start_pos' parameter from the __copy_xstate_to_*() functions
Commit-ID:  8a5b731889cbf004b406d988dc591c8a7aac773e
Gitweb: http://git.kernel.org/tip/8a5b731889cbf004b406d988dc591c8a7aac773e
Author: Ingo Molnar <mingo@kernel.org>
AuthorDate: Sat, 23 Sep 2017 14:59:50 +0200
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Sun, 24 Sep 2017 13:04:31 +0200

x86/fpu: Remove the 'start_pos' parameter from the __copy_xstate_to_*() functions

'start_pos' is always 0, so remove it and remove the pointless check of 'pos < 0'
which can not ever be true as 'pos' is unsigned ...

No change in functionality.

Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Eric Biggers <ebiggers3@gmail.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>
Link: http://lkml.kernel.org/r/20170923130016.21448-8-mingo@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
arch/x86/kernel/fpu/xstate.c | 20 ++++++++++----------
1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/arch/x86/kernel/fpu/xstate.c b/arch/x86/kernel/fpu/xstate.c
index 9647e72..1f50fda 100644
--- a/arch/x86/kernel/fpu/xstate.c
+++ b/arch/x86/kernel/fpu/xstate.c
@@ -927,9 +927,9 @@ int arch_set_user_pkey_access(struct task_struct *tsk, int pkey,
static inline int
__copy_xstate_to_kernel(void *kbuf,
const void *data,
- unsigned int pos, unsigned int count, int start_pos, int end_pos)
+ unsigned int pos, unsigned int count, int end_pos)
{
- if ((count == 0) || (pos < start_pos))
+ if (!count)
return 0;

if (end_pos < 0 || pos < end_pos) {
@@ -972,7 +972,7 @@ int copy_xstate_to_kernel(void *kbuf, struct xregs_state *xsave, unsigned int po
offset = offsetof(struct xregs_state, header);
size = sizeof(header);

- ret = __copy_xstate_to_kernel(kbuf, &header, offset, size, 0, count);
+ ret = __copy_xstate_to_kernel(kbuf, &header, offset, size, count);
if (ret)
return ret;

@@ -986,7 +986,7 @@ int copy_xstate_to_kernel(void *kbuf, struct xregs_state *xsave, unsigned int po
offset = xstate_offsets[i];
size = xstate_sizes[i];

- ret = __copy_xstate_to_kernel(kbuf, src, offset, size, 0, count);
+ ret = __copy_xstate_to_kernel(kbuf, src, offset, size, count);
if (ret)
return ret;

@@ -1002,7 +1002,7 @@ int copy_xstate_to_kernel(void *kbuf, struct xregs_state *xsave, unsigned int po
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, 0, count);
+ ret = __copy_xstate_to_kernel(kbuf, xstate_fx_sw_bytes, offset, size, count);
if (ret)
return ret;

@@ -1010,9 +1010,9 @@ int copy_xstate_to_kernel(void *kbuf, struct xregs_state *xsave, unsigned int po
}

static inline int
-__copy_xstate_to_user(void __user *ubuf, const void *data, unsigned int pos, unsigned int count, int start_pos, int end_pos)
+__copy_xstate_to_user(void __user *ubuf, const void *data, unsigned int pos, unsigned int count, int end_pos)
{
- if ((count == 0) || (pos < start_pos))
+ if (!count)
return 0;

if (end_pos < 0 || pos < end_pos) {
@@ -1055,7 +1055,7 @@ int copy_xstate_to_user(void __user *ubuf, struct xregs_state *xsave, unsigned i
offset = offsetof(struct xregs_state, header);
size = sizeof(header);

- ret = __copy_xstate_to_user(ubuf, &header, offset, size, 0, count);
+ ret = __copy_xstate_to_user(ubuf, &header, offset, size, count);
if (ret)
return ret;

@@ -1069,7 +1069,7 @@ int copy_xstate_to_user(void __user *ubuf, struct xregs_state *xsave, unsigned i
offset = xstate_offsets[i];
size = xstate_sizes[i];

- ret = __copy_xstate_to_user(ubuf, src, offset, size, 0, count);
+ ret = __copy_xstate_to_user(ubuf, src, offset, size, count);
if (ret)
return ret;

@@ -1085,7 +1085,7 @@ int copy_xstate_to_user(void __user *ubuf, struct xregs_state *xsave, unsigned i
offset = offsetof(struct fxregs_state, sw_reserved);
size = sizeof(xstate_fx_sw_bytes);

- ret = __copy_xstate_to_user(ubuf, xstate_fx_sw_bytes, offset, size, 0, count);
+ ret = __copy_xstate_to_user(ubuf, xstate_fx_sw_bytes, offset, size, count);
if (ret)
return ret;

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