Date: Wed, 7 Sep 2022 15:10:37 GMT From: Emmanuel Vadot <manu@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org Subject: git: 9ecde173624c - stable/13 - linuxkpi: Add __copy_to_user_inatomic and __copy_from_user_inatomic Message-ID: <202209071510.287FAboo026521@gitrepo.freebsd.org>
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The branch stable/13 has been updated by manu: URL: https://cgit.FreeBSD.org/src/commit/?id=9ecde173624c892a2b9aba2a1b4ca977b63fd513 commit 9ecde173624c892a2b9aba2a1b4ca977b63fd513 Author: Emmanuel Vadot <manu@FreeBSD.org> AuthorDate: 2022-08-10 06:44:14 +0000 Commit: Emmanuel Vadot <manu@FreeBSD.org> CommitDate: 2022-09-07 15:09:06 +0000 linuxkpi: Add __copy_to_user_inatomic and __copy_from_user_inatomic Reviewed by: bz Obtained from: drm-kmod Sponsored by: Beckhoff Automation GmbH & Co. KG Differential Revision: https://reviews.freebsd.org/D36113 (cherry picked from commit 76d93395c522e28cfa329ba57ca235929462412c) --- sys/compat/linuxkpi/common/include/linux/uaccess.h | 25 ++++++++++++++++++++++ 1 file changed, 25 insertions(+) diff --git a/sys/compat/linuxkpi/common/include/linux/uaccess.h b/sys/compat/linuxkpi/common/include/linux/uaccess.h index c62a94e8e044..3fa16dbcd261 100644 --- a/sys/compat/linuxkpi/common/include/linux/uaccess.h +++ b/sys/compat/linuxkpi/common/include/linux/uaccess.h @@ -89,4 +89,29 @@ pagefault_disabled(void) return ((curthread->td_pflags & TDP_NOFAULTING) != 0); } +static inline int +__copy_to_user_inatomic(void __user *to, const void *from, unsigned n) +{ + + return (copyout_nofault(from, to, n) != 0 ? n : 0); +} +#define __copy_to_user_inatomic_nocache(to, from, n) \ + __copy_to_user_inatomic((to), (from), (n)) + +static inline unsigned long +__copy_from_user_inatomic(void *to, const void __user *from, + unsigned long n) +{ + /* + * XXXKIB. Equivalent Linux function is implemented using + * MOVNTI for aligned moves. For unaligned head and tail, + * normal move is performed. As such, it is not incorrect, if + * only somewhat slower, to use normal copyin. All uses + * except shmem_pwrite_fast() have the destination mapped WC. + */ + return ((copyin_nofault(__DECONST(void *, from), to, n) != 0 ? n : 0)); +} +#define __copy_from_user_inatomic_nocache(to, from, n) \ + __copy_from_user_inatomic((to), (from), (n)) + #endif /* _LINUXKPI_LINUX_UACCESS_H_ */
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