forked from Minki/linux
kill __copy_from_user_nocache()
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
parent
122b05ddf5
commit
3f763453e6
@ -14,8 +14,6 @@ unsigned long __must_check __copy_from_user_ll
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(void *to, const void __user *from, unsigned long n);
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unsigned long __must_check __copy_from_user_ll_nozero
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(void *to, const void __user *from, unsigned long n);
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unsigned long __must_check __copy_from_user_ll_nocache
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(void *to, const void __user *from, unsigned long n);
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unsigned long __must_check __copy_from_user_ll_nocache_nozero
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(void *to, const void __user *from, unsigned long n);
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@ -119,34 +117,6 @@ __copy_from_user(void *to, const void __user *from, unsigned long n)
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return __copy_from_user_ll(to, from, n);
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}
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static __always_inline unsigned long __copy_from_user_nocache(void *to,
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const void __user *from, unsigned long n)
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{
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might_fault();
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if (__builtin_constant_p(n)) {
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unsigned long ret;
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switch (n) {
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case 1:
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__uaccess_begin();
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__get_user_size(*(u8 *)to, from, 1, ret, 1);
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__uaccess_end();
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return ret;
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case 2:
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__uaccess_begin();
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__get_user_size(*(u16 *)to, from, 2, ret, 2);
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__uaccess_end();
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return ret;
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case 4:
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__uaccess_begin();
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__get_user_size(*(u32 *)to, from, 4, ret, 4);
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__uaccess_end();
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return ret;
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}
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}
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return __copy_from_user_ll_nocache(to, from, n);
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}
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static __always_inline unsigned long
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__copy_from_user_inatomic_nocache(void *to, const void __user *from,
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unsigned long n)
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@ -260,14 +260,6 @@ __copy_to_user_inatomic(void __user *dst, const void *src, unsigned size)
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extern long __copy_user_nocache(void *dst, const void __user *src,
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unsigned size, int zerorest);
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static inline int
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__copy_from_user_nocache(void *dst, const void __user *src, unsigned size)
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{
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might_fault();
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kasan_check_write(dst, size);
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return __copy_user_nocache(dst, src, size, 1);
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}
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static inline int
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__copy_from_user_inatomic_nocache(void *dst, const void __user *src,
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unsigned size)
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@ -293,105 +293,6 @@ __copy_user_zeroing_intel(void *to, const void __user *from, unsigned long size)
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return size;
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}
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/*
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* Non Temporal Hint version of __copy_user_zeroing_intel. It is cache aware.
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* hyoshiok@miraclelinux.com
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*/
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static unsigned long __copy_user_zeroing_intel_nocache(void *to,
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const void __user *from, unsigned long size)
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{
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int d0, d1;
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__asm__ __volatile__(
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" .align 2,0x90\n"
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"0: movl 32(%4), %%eax\n"
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" cmpl $67, %0\n"
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" jbe 2f\n"
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"1: movl 64(%4), %%eax\n"
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" .align 2,0x90\n"
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"2: movl 0(%4), %%eax\n"
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"21: movl 4(%4), %%edx\n"
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" movnti %%eax, 0(%3)\n"
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" movnti %%edx, 4(%3)\n"
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"3: movl 8(%4), %%eax\n"
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"31: movl 12(%4),%%edx\n"
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" movnti %%eax, 8(%3)\n"
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" movnti %%edx, 12(%3)\n"
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"4: movl 16(%4), %%eax\n"
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"41: movl 20(%4), %%edx\n"
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" movnti %%eax, 16(%3)\n"
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" movnti %%edx, 20(%3)\n"
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"10: movl 24(%4), %%eax\n"
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"51: movl 28(%4), %%edx\n"
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" movnti %%eax, 24(%3)\n"
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" movnti %%edx, 28(%3)\n"
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"11: movl 32(%4), %%eax\n"
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"61: movl 36(%4), %%edx\n"
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" movnti %%eax, 32(%3)\n"
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" movnti %%edx, 36(%3)\n"
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"12: movl 40(%4), %%eax\n"
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"71: movl 44(%4), %%edx\n"
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" movnti %%eax, 40(%3)\n"
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" movnti %%edx, 44(%3)\n"
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"13: movl 48(%4), %%eax\n"
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"81: movl 52(%4), %%edx\n"
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" movnti %%eax, 48(%3)\n"
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" movnti %%edx, 52(%3)\n"
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"14: movl 56(%4), %%eax\n"
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"91: movl 60(%4), %%edx\n"
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" movnti %%eax, 56(%3)\n"
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" movnti %%edx, 60(%3)\n"
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" addl $-64, %0\n"
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" addl $64, %4\n"
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" addl $64, %3\n"
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" cmpl $63, %0\n"
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" ja 0b\n"
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" sfence \n"
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"5: movl %0, %%eax\n"
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" shrl $2, %0\n"
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" andl $3, %%eax\n"
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" cld\n"
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"6: rep; movsl\n"
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" movl %%eax,%0\n"
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"7: rep; movsb\n"
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"8:\n"
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".section .fixup,\"ax\"\n"
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"9: lea 0(%%eax,%0,4),%0\n"
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"16: pushl %0\n"
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" pushl %%eax\n"
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" xorl %%eax,%%eax\n"
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" rep; stosb\n"
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" popl %%eax\n"
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" popl %0\n"
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" jmp 8b\n"
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".previous\n"
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_ASM_EXTABLE(0b,16b)
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_ASM_EXTABLE(1b,16b)
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_ASM_EXTABLE(2b,16b)
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_ASM_EXTABLE(21b,16b)
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_ASM_EXTABLE(3b,16b)
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_ASM_EXTABLE(31b,16b)
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_ASM_EXTABLE(4b,16b)
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_ASM_EXTABLE(41b,16b)
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_ASM_EXTABLE(10b,16b)
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_ASM_EXTABLE(51b,16b)
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_ASM_EXTABLE(11b,16b)
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_ASM_EXTABLE(61b,16b)
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_ASM_EXTABLE(12b,16b)
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_ASM_EXTABLE(71b,16b)
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_ASM_EXTABLE(13b,16b)
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_ASM_EXTABLE(81b,16b)
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_ASM_EXTABLE(14b,16b)
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_ASM_EXTABLE(91b,16b)
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_ASM_EXTABLE(6b,9b)
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_ASM_EXTABLE(7b,16b)
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: "=&c"(size), "=&D" (d0), "=&S" (d1)
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: "1"(to), "2"(from), "0"(size)
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: "eax", "edx", "memory");
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return size;
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}
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static unsigned long __copy_user_intel_nocache(void *to,
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const void __user *from, unsigned long size)
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{
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@ -490,8 +391,6 @@ unsigned long __copy_user_zeroing_intel(void *to, const void __user *from,
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unsigned long size);
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unsigned long __copy_user_intel(void __user *to, const void *from,
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unsigned long size);
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unsigned long __copy_user_zeroing_intel_nocache(void *to,
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const void __user *from, unsigned long size);
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#endif /* CONFIG_X86_INTEL_USERCOPY */
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/* Generic arbitrary sized copy. */
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@ -607,23 +506,6 @@ unsigned long __copy_from_user_ll_nozero(void *to, const void __user *from,
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}
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EXPORT_SYMBOL(__copy_from_user_ll_nozero);
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unsigned long __copy_from_user_ll_nocache(void *to, const void __user *from,
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unsigned long n)
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{
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stac();
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#ifdef CONFIG_X86_INTEL_USERCOPY
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if (n > 64 && static_cpu_has(X86_FEATURE_XMM2))
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n = __copy_user_zeroing_intel_nocache(to, from, n);
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else
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__copy_user_zeroing(to, from, n);
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#else
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__copy_user_zeroing(to, from, n);
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#endif
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clac();
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return n;
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}
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EXPORT_SYMBOL(__copy_from_user_ll_nocache);
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unsigned long __copy_from_user_ll_nocache_nozero(void *to, const void __user *from,
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unsigned long n)
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{
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@ -261,12 +261,6 @@ static inline unsigned long __copy_from_user_inatomic_nocache(void *to,
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return __copy_from_user_inatomic(to, from, n);
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}
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static inline unsigned long __copy_from_user_nocache(void *to,
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const void __user *from, unsigned long n)
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{
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return __copy_from_user(to, from, n);
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}
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#endif /* ARCH_HAS_NOCACHE_UACCESS */
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/*
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@ -604,7 +604,7 @@ size_t copy_from_iter_nocache(void *addr, size_t bytes, struct iov_iter *i)
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return 0;
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}
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iterate_and_advance(i, bytes, v,
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__copy_from_user_nocache((to += v.iov_len) - v.iov_len,
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__copy_from_user_inatomic_nocache((to += v.iov_len) - v.iov_len,
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v.iov_base, v.iov_len),
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memcpy_from_page((to += v.bv_len) - v.bv_len, v.bv_page,
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v.bv_offset, v.bv_len),
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@ -625,7 +625,7 @@ bool copy_from_iter_full_nocache(void *addr, size_t bytes, struct iov_iter *i)
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if (unlikely(i->count < bytes))
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return false;
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iterate_all_kinds(i, bytes, v, ({
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if (__copy_from_user_nocache((to += v.iov_len) - v.iov_len,
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if (__copy_from_user_inatomic_nocache((to += v.iov_len) - v.iov_len,
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v.iov_base, v.iov_len))
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return false;
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0;}),
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