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authorIngo Molnar <mingo@kernel.org>2017-09-23 15:59:51 +0300
committerIngo Molnar <mingo@kernel.org>2017-09-24 14:04:32 +0300
commit56583c9a1400fe1935edd55b24b4fbbc779b59cb (patch)
tree098108496aff58c152840a0547b0d879dcd82c28 /arch/x86/kernel/fpu
parent8a5b731889cbf004b406d988dc591c8a7aac773e (diff)
downloadlinux-56583c9a1400fe1935edd55b24b4fbbc779b59cb.tar.xz
x86/fpu: Clarify parameter names in the copy_xstate_to_*() methods
Right now there's a confusing mixture of 'offset' and 'size' parameters: - __copy_xstate_to_*() input parameter 'end_pos' not not really an offset, but the full size of the copy to be performed. - input parameter 'count' to copy_xstate_to_*() shadows that of __copy_xstate_to_*()'s 'count' parameter name - but the roles are different: the first one is the total number of bytes to be copied, while the second one is a partial copy size. To unconfuse all this, use a consistent set of parameter names: - 'size' is the partial copy size within a single xstate component - 'size_total' is the total copy requested - 'offset_start' is the requested starting offset. - 'offset' is the offset within an xstate component. 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/20170923130016.21448-9-mingo@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/kernel/fpu')
-rw-r--r--arch/x86/kernel/fpu/xstate.c44
1 files changed, 22 insertions, 22 deletions
diff --git a/arch/x86/kernel/fpu/xstate.c b/arch/x86/kernel/fpu/xstate.c
index 1f50fdaf4c5a..c13083579655 100644
--- a/arch/x86/kernel/fpu/xstate.c
+++ b/arch/x86/kernel/fpu/xstate.c
@@ -927,15 +927,15 @@ 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 end_pos)
+ unsigned int offset, unsigned int size, int size_total)
{
- if (!count)
+ if (!size)
return 0;
- if (end_pos < 0 || pos < end_pos) {
- unsigned int copy = end_pos < 0 ? count : min(count, end_pos - pos);
+ if (size_total < 0 || offset < size_total) {
+ unsigned int copy = size_total < 0 ? size : min(size, size_total - offset);
- memcpy(kbuf + pos, data, copy);
+ memcpy(kbuf + offset, data, copy);
}
return 0;
}
@@ -947,7 +947,7 @@ __copy_xstate_to_kernel(void *kbuf,
* It supports partial copy but pos always starts from zero. This is called
* from xstateregs_get() and there we check the CPU has XSAVES.
*/
-int copy_xstate_to_kernel(void *kbuf, struct xregs_state *xsave, unsigned int pos, unsigned int count)
+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;
@@ -956,7 +956,7 @@ int copy_xstate_to_kernel(void *kbuf, struct xregs_state *xsave, unsigned int po
/*
* Currently copy_regset_to_user() starts from pos 0:
*/
- if (unlikely(pos != 0))
+ if (unlikely(offset_start != 0))
return -EFAULT;
/*
@@ -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, count);
+ ret = __copy_xstate_to_kernel(kbuf, &header, offset, size, size_total);
if (ret)
return ret;
@@ -986,11 +986,11 @@ 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, count);
+ ret = __copy_xstate_to_kernel(kbuf, src, offset, size, size_total);
if (ret)
return ret;
- if (offset + size >= count)
+ if (offset + size >= size_total)
break;
}
@@ -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, count);
+ ret = __copy_xstate_to_kernel(kbuf, xstate_fx_sw_bytes, offset, size, size_total);
if (ret)
return ret;
@@ -1010,15 +1010,15 @@ 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 end_pos)
+__copy_xstate_to_user(void __user *ubuf, const void *data, unsigned int offset, unsigned int size, int size_total)
{
- if (!count)
+ if (!size)
return 0;
- if (end_pos < 0 || pos < end_pos) {
- unsigned int copy = end_pos < 0 ? count : min(count, end_pos - pos);
+ if (size_total < 0 || offset < size_total) {
+ unsigned int copy = size_total < 0 ? size : min(size, size_total - offset);
- if (__copy_to_user(ubuf + pos, data, copy))
+ if (__copy_to_user(ubuf + offset, data, copy))
return -EFAULT;
}
return 0;
@@ -1030,7 +1030,7 @@ __copy_xstate_to_user(void __user *ubuf, const void *data, unsigned int pos, uns
* zero. This is called from xstateregs_get() and there we check the CPU
* has XSAVES.
*/
-int copy_xstate_to_user(void __user *ubuf, struct xregs_state *xsave, unsigned int pos, unsigned int count)
+int copy_xstate_to_user(void __user *ubuf, struct xregs_state *xsave, unsigned int offset_start, unsigned int size_total)
{
unsigned int offset, size;
int ret, i;
@@ -1039,7 +1039,7 @@ int copy_xstate_to_user(void __user *ubuf, struct xregs_state *xsave, unsigned i
/*
* Currently copy_regset_to_user() starts from pos 0:
*/
- if (unlikely(pos != 0))
+ if (unlikely(offset_start != 0))
return -EFAULT;
/*
@@ -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, count);
+ ret = __copy_xstate_to_user(ubuf, &header, offset, size, size_total);
if (ret)
return ret;
@@ -1069,11 +1069,11 @@ 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, count);
+ ret = __copy_xstate_to_user(ubuf, src, offset, size, size_total);
if (ret)
return ret;
- if (offset + size >= count)
+ if (offset + size >= size_total)
break;
}
@@ -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, count);
+ ret = __copy_xstate_to_user(ubuf, xstate_fx_sw_bytes, offset, size, size_total);
if (ret)
return ret;