Date: Sun, 7 Jan 2018 10:02:34 -0800 (PST) From: "Rodney W. Grimes" <freebsd@pdx.rh.CN85.dnsmgr.net> To: Kristof Provost <kp@freebsd.org> Cc: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: Re: svn commit: r327676 - head/sys/compat/linuxkpi/common/include/linux Message-ID: <201801071802.w07I2YEB017699@pdx.rh.CN85.dnsmgr.net> In-Reply-To: <201801071339.w07DdCaX070032@repo.freebsd.org>
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[ Charset UTF-8 unsupported, converting... ] > Author: kp > Date: Sun Jan 7 13:39:12 2018 > New Revision: 327676 > URL: https://svnweb.freebsd.org/changeset/base/327676 > > Log: > linuxkpi: Implement kcalloc() based on mallocarray() > > This means we now get integer overflow protection, which Linux code > might expect as it is also provided by kcalloc() in Linux. > > Modified: > head/sys/compat/linuxkpi/common/include/linux/slab.h > > Modified: head/sys/compat/linuxkpi/common/include/linux/slab.h > ============================================================================== > --- head/sys/compat/linuxkpi/common/include/linux/slab.h Sun Jan 7 13:35:15 2018 (r327675) > +++ head/sys/compat/linuxkpi/common/include/linux/slab.h Sun Jan 7 13:39:12 2018 (r327676) > @@ -46,7 +46,6 @@ MALLOC_DECLARE(M_KMALLOC); > #define kzalloc(size, flags) kmalloc(size, (flags) | __GFP_ZERO) > #define kzalloc_node(size, flags, node) kmalloc(size, (flags) | __GFP_ZERO) > #define kfree_const(ptr) kfree(ptr) > -#define kcalloc(n, size, flags) kmalloc((n) * (size), (flags) | __GFP_ZERO) Would not: #define kcalloc(n, size, flags) mallocarray(mallocarray((n), (size), M_KMALLOC, linux_check_m_flags((flags | __GFP_ZERO)) work just fine, saving a call and stack use of about framesize + 32 bytes? > #define vzalloc(size) __vmalloc(size, GFP_KERNEL | __GFP_NOWARN | __GFP_ZERO, 0) > #define vfree(arg) kfree(arg) > #define kvfree(arg) kfree(arg) > @@ -98,6 +97,13 @@ static inline void * > kmalloc(size_t size, gfp_t flags) > { > return (malloc(size, M_KMALLOC, linux_check_m_flags(flags))); > +} > + > +static inline void * > +kcalloc(size_t n, size_t size, gfp_t flags) > +{ > + flags |= __GFP_ZERO; > + return (mallocarray(n, size, M_KMALLOC, linux_check_m_flags(flags))); > } > > static inline void * > > -- Rod Grimes rgrimes@freebsd.org
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