Author: hselasky Date: Fri Aug 11 10:44:40 2017 New Revision: 322397 URL: https://svnweb.freebsd.org/changeset/base/322397
Log: Make sure the "vm_flags" and "vm_page_prot" fields get set correctly in the VM area structure in the LinuxKPI when doing mmap() and that unsupported bits are masked away. While at it fix some redundant use of parenthesing inside some related macros. Found by: KrishnamRaju ErapaRaju <krish...@chelsio.com> MFC after: 1 week Sponsored by: Mellanox Technologies Modified: head/sys/compat/linuxkpi/common/include/linux/page.h head/sys/compat/linuxkpi/common/src/linux_compat.c Modified: head/sys/compat/linuxkpi/common/include/linux/page.h ============================================================================== --- head/sys/compat/linuxkpi/common/include/linux/page.h Fri Aug 11 10:08:18 2017 (r322396) +++ head/sys/compat/linuxkpi/common/include/linux/page.h Fri Aug 11 10:44:40 2017 (r322397) @@ -48,38 +48,36 @@ typedef unsigned long pgprot_t; #define page vm_page -#define LINUXKPI_PROT_VALID (1 << 4) -#define LINUXKPI_CACHE_MODE_SHIFT 3 +#define LINUXKPI_PROT_VALID (1 << 3) +#define LINUXKPI_CACHE_MODE_SHIFT 4 +CTASSERT((VM_PROT_ALL & -LINUXKPI_PROT_VALID) == 0); + static inline pgprot_t cachemode2protval(vm_memattr_t attr) { - return ((attr | LINUXKPI_PROT_VALID) << LINUXKPI_CACHE_MODE_SHIFT); + return ((attr << LINUXKPI_CACHE_MODE_SHIFT) | LINUXKPI_PROT_VALID); } static inline vm_memattr_t pgprot2cachemode(pgprot_t prot) { - int val; - - val = prot >> LINUXKPI_CACHE_MODE_SHIFT; - - if (val & LINUXKPI_PROT_VALID) - return (val & ~LINUXKPI_PROT_VALID); + if (prot & LINUXKPI_PROT_VALID) + return (prot >> LINUXKPI_CACHE_MODE_SHIFT); else return (VM_MEMATTR_DEFAULT); } -#define virt_to_page(x) PHYS_TO_VM_PAGE(vtophys((x))) -#define page_to_pfn(pp) (VM_PAGE_TO_PHYS((pp)) >> PAGE_SHIFT) +#define virt_to_page(x) PHYS_TO_VM_PAGE(vtophys(x)) +#define page_to_pfn(pp) (VM_PAGE_TO_PHYS(pp) >> PAGE_SHIFT) #define pfn_to_page(pfn) (PHYS_TO_VM_PAGE((pfn) << PAGE_SHIFT)) -#define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n)) +#define nth_page(page,n) pfn_to_page(page_to_pfn(page) + (n)) -#define clear_page(page) memset((page), 0, PAGE_SIZE) +#define clear_page(page) memset(page, 0, PAGE_SIZE) #define pgprot_noncached(prot) \ - ((prot) | cachemode2protval(VM_MEMATTR_UNCACHEABLE)) + (((prot) & VM_PROT_ALL) | cachemode2protval(VM_MEMATTR_UNCACHEABLE)) #define pgprot_writecombine(prot) \ - ((prot) | cachemode2protval(VM_MEMATTR_WRITE_COMBINING)) + (((prot) & VM_PROT_ALL) | cachemode2protval(VM_MEMATTR_WRITE_COMBINING)) #undef PAGE_MASK #define PAGE_MASK (~(PAGE_SIZE-1)) Modified: head/sys/compat/linuxkpi/common/src/linux_compat.c ============================================================================== --- head/sys/compat/linuxkpi/common/src/linux_compat.c Fri Aug 11 10:08:18 2017 (r322396) +++ head/sys/compat/linuxkpi/common/src/linux_compat.c Fri Aug 11 10:44:40 2017 (r322397) @@ -1210,7 +1210,7 @@ linux_dev_mmap_single(struct cdev *dev, vm_ooffset_t * vmap->vm_end = size; vmap->vm_pgoff = *offset / PAGE_SIZE; vmap->vm_pfn = 0; - vmap->vm_flags = vmap->vm_page_prot = nprot; + vmap->vm_flags = vmap->vm_page_prot = (nprot & VM_PROT_ALL); vmap->vm_ops = NULL; vmap->vm_file = get_file(filp); vmap->vm_mm = mm; _______________________________________________ svn-src-all@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"