x86: clean up csum-wrappers_64.c some more
no code changed: arch/x86/lib/csum-wrappers_64.o: text data bss dec hex filename 839 0 0 839 347 csum-wrappers_64.o.before 839 0 0 839 347 csum-wrappers_64.o.after md5: b31994226c33e0b52bef5a0e110b84b0 csum-wrappers_64.o.before.asm b31994226c33e0b52bef5a0e110b84b0 csum-wrappers_64.o.after.asm Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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@ -1,9 +1,9 @@
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/* Copyright 2002,2003 Andi Kleen, SuSE Labs.
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/*
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* Copyright 2002, 2003 Andi Kleen, SuSE Labs.
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* Subject to the GNU Public License v.2
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*
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* Wrappers of assembly checksum functions for x86-64.
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*/
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#include <asm/checksum.h>
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#include <linux/module.h>
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@ -24,19 +24,26 @@ csum_partial_copy_from_user(const void __user *src, void *dst,
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{
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might_sleep();
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*errp = 0;
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if (likely(access_ok(VERIFY_READ, src, len))) {
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/* Why 6, not 7? To handle odd addresses aligned we
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would need to do considerable complications to fix the
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checksum which is defined as an 16bit accumulator. The
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fix alignment code is primarily for performance
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compatibility with 32bit and that will handle odd
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addresses slowly too. */
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if (!likely(access_ok(VERIFY_READ, src, len)))
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goto out_err;
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/*
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* Why 6, not 7? To handle odd addresses aligned we
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* would need to do considerable complications to fix the
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* checksum which is defined as an 16bit accumulator. The
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* fix alignment code is primarily for performance
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* compatibility with 32bit and that will handle odd
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* addresses slowly too.
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*/
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if (unlikely((unsigned long)src & 6)) {
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while (((unsigned long)src & 6) && len >= 2) {
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__u16 val16;
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*errp = __get_user(val16, (const __u16 __user *)src);
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if (*errp)
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return isum;
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*(__u16 *)dst = val16;
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isum = (__force __wsum)add32_with_carry(
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(__force unsigned)isum, val16);
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@ -47,14 +54,17 @@ csum_partial_copy_from_user(const void __user *src, void *dst,
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}
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isum = csum_partial_copy_generic((__force const void *)src,
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dst, len, isum, errp, NULL);
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if (likely(*errp == 0))
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if (unlikely(*errp))
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goto out_err;
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return isum;
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}
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out_err:
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*errp = -EFAULT;
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memset(dst, 0, len);
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return isum;
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}
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EXPORT_SYMBOL(csum_partial_copy_from_user);
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/**
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@ -73,6 +83,7 @@ csum_partial_copy_to_user(const void *src, void __user *dst,
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int len, __wsum isum, int *errp)
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{
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might_sleep();
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if (unlikely(!access_ok(VERIFY_WRITE, dst, len))) {
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*errp = -EFAULT;
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return 0;
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@ -81,6 +92,7 @@ csum_partial_copy_to_user(const void *src, void __user *dst,
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if (unlikely((unsigned long)dst & 6)) {
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while (((unsigned long)dst & 6) && len >= 2) {
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__u16 val16 = *(__u16 *)src;
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isum = (__force __wsum)add32_with_carry(
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(__force unsigned)isum, val16);
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*errp = __put_user(val16, (__u16 __user *)dst);
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@ -93,9 +105,9 @@ csum_partial_copy_to_user(const void *src, void __user *dst,
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}
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*errp = 0;
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return csum_partial_copy_generic(src, (void __force *)dst, len, isum, NULL, errp);
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return csum_partial_copy_generic(src, (void __force *)dst,
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len, isum, NULL, errp);
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}
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EXPORT_SYMBOL(csum_partial_copy_to_user);
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/**
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@ -122,14 +134,17 @@ __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
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rest = (__force __u64)htonl(len) + (__force __u64)htons(proto) +
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(__force __u64)sum;
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asm(" addq (%[saddr]),%[sum]\n"
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" adcq 8(%[saddr]),%[sum]\n"
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" adcq (%[daddr]),%[sum]\n"
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" adcq 8(%[daddr]),%[sum]\n"
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" adcq $0,%[sum]\n"
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: [sum] "=r" (sum64)
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: "[sum]" (rest), [saddr] "r" (saddr), [daddr] "r" (daddr));
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return csum_fold((__force __wsum)add32_with_carry(sum64 & 0xffffffff, sum64>>32));
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}
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return csum_fold(
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(__force __wsum)add32_with_carry(sum64 & 0xffffffff, sum64>>32));
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}
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EXPORT_SYMBOL(csum_ipv6_magic);
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