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x86, mm: pass in 'total' to __copy_from_user_*nocache()

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Impact: cleanup, enable future change

Add a 'total bytes copied' parameter to __copy_from_user_*nocache(),
and update all the callsites.

The parameter is not used yet - architecture code can use it to
more intelligently decide whether the copy should be cached or
non-temporal.

Cc: Salman Qazi <sqazi@google.com>
Cc: Nick Piggin <npiggin@suse.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ingo Molnar
2009-02-25 08:21:52 +01:00
parent 95f66b3770
commit 3255aa2eb6
6 changed files with 14 additions and 13 deletions
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4
arch/x86/include/asm/uaccess_32.h
View File

@ -157,7 +157,7 @@ __copy_from_user(void *to, const void __user *from, unsigned long n)
}
static __always_inline unsigned long __copy_from_user_nocache(void *to,
const void __user *from, unsigned long n)
const void __user *from, unsigned long n, unsigned long total)
{
might_fault();
if (__builtin_constant_p(n)) {
@ -180,7 +180,7 @@ static __always_inline unsigned long __copy_from_user_nocache(void *to,
static __always_inline unsigned long
__copy_from_user_inatomic_nocache(void *to, const void __user *from,
unsigned long n)
unsigned long n, unsigned long total)
{
return __copy_from_user_ll_nocache_nozero(to, from, n);
}

5
arch/x86/include/asm/uaccess_64.h
View File

@ -189,7 +189,7 @@ extern long __copy_user_nocache(void *dst, const void __user *src,
unsigned size, int zerorest);
static inline int __copy_from_user_nocache(void *dst, const void __user *src,
unsigned size)
unsigned size, unsigned long total)
{
might_sleep();
/*
@ -205,8 +205,7 @@ static inline int __copy_from_user_nocache(void *dst, const void __user *src,
}
static inline int __copy_from_user_inatomic_nocache(void *dst,
const void __user *src,
unsigned size)
const void __user *src, unsigned size, unsigned total)
{
if (likely(size >= PAGE_SIZE))
return __copy_user_nocache(dst, src, size, 0);