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8b45dda2bc
The big fix here is the removal of kmalloc() in kv_alloc(). It used to be true in previous kernels that kmallocs over PAGE_SIZE would always be pages aligned. This is no longer true atleast in 2.6.31 there are no longer any alignment expectations. Since kv_alloc() requires the resulting address to be page align we no only either directly allocate pages in the KMC_KMEM case, or directly call __vmalloc() both of which will always return a page aligned address. Additionally, to avoid wasting memory size is always a power of two. As for cleanup several helper functions were introduced to calculate the aligned sizes of various data structures. This helps ensure no case is accidentally missed where the alignment needs to be taken in to account. The helpers now use P2ROUNDUP_TYPE instead of P2ROUNDUP which is safer since the type will be explict and we no longer count on the compiler to auto promote types hopefully as we expected. Always wnforce minimum (SPL_KMEM_CACHE_ALIGN) and maximum (PAGE_SIZE) alignment restrictions at cache creation time. Use SPL_KMEM_CACHE_ALIGN in splat alignment test.
222 lines
6.6 KiB
C
222 lines
6.6 KiB
C
/*
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* This file is part of the SPL: Solaris Porting Layer.
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*
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* Copyright (c) 2008 Lawrence Livermore National Security, LLC.
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* Produced at Lawrence Livermore National Laboratory
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* Written by:
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* Brian Behlendorf <behlendorf1@llnl.gov>,
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* Herb Wartens <wartens2@llnl.gov>,
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* Jim Garlick <garlick@llnl.gov>
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* UCRL-CODE-235197
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*
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* This is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef _SPL_SYSMACROS_H
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#define _SPL_SYSMACROS_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <linux/module.h>
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#include <sys/debug.h>
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#include <sys/varargs.h>
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#include <sys/zone.h>
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#include <sys/signal.h>
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#ifndef _KERNEL
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#define _KERNEL __KERNEL__
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#endif
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/* Missing defines.
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*/
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#define FALSE 0
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#define TRUE 1
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#define INT32_MAX INT_MAX
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#define INT32_MIN INT_MIN
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#define UINT32_MAX UINT_MAX
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#define UINT32_MIN UINT_MIN
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#define INT64_MAX LLONG_MAX
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#define INT64_MIN LLONG_MIN
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#define UINT64_MAX ULLONG_MAX
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#define UINT64_MIN ULLONG_MIN
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#define NBBY 8
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#define ENOTSUP ENOTSUPP
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#define MAXMSGLEN 256
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#define MAXNAMELEN 256
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#define MAXPATHLEN PATH_MAX
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#ifdef _LP64
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#define MAXOFFSET_T 0x7fffffffffffffffl
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#else
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#define MAXOFFSET_T 0x7fffffffl
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#endif
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#define MAXBSIZE 8192
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#define DEV_BSIZE 512
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#define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */
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#define curproc current
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#define proc_pageout NULL
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#define max_ncpus 64
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#define CPU_SEQID smp_processor_id() /* I think... */
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#define _NOTE(x)
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#define RLIM64_INFINITY RLIM_INFINITY
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/* 0..MAX_PRIO-1: Process priority
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* 0..MAX_RT_PRIO-1: RT priority tasks
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* MAX_RT_PRIO..MAX_PRIO-1: SCHED_NORMAL tasks
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*
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* Treat shim tasks as SCHED_NORMAL tasks
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*/
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#define minclsyspri (MAX_RT_PRIO)
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#define maxclsyspri (MAX_PRIO-1)
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#define NICE_TO_PRIO(nice) (MAX_RT_PRIO + (nice) + 20)
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#define PRIO_TO_NICE(prio) ((prio) - MAX_RT_PRIO - 20)
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/* Missing macros
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*/
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#define PAGESIZE PAGE_SIZE
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/* from Solaris sys/byteorder.h */
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#define BSWAP_8(x) ((x) & 0xff)
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#define BSWAP_16(x) ((BSWAP_8(x) << 8) | BSWAP_8((x) >> 8))
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#define BSWAP_32(x) ((BSWAP_16(x) << 16) | BSWAP_16((x) >> 16))
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#define BSWAP_64(x) ((BSWAP_32(x) << 32) | BSWAP_32((x) >> 32))
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/* Map some simple functions.
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*/
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#define bzero(ptr,size) memset(ptr,0,size)
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#define bcopy(src,dest,size) memcpy(dest,src,size)
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#define bcmp(src,dest,size) memcmp((src), (dest), (size_t)(size))
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/* Dtrace probes do not exist in the linux kernel */
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#ifdef DTRACE_PROBE
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#undef DTRACE_PROBE
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#endif /* DTRACE_PROBE */
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#define DTRACE_PROBE(a) ((void)0)
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#ifdef DTRACE_PROBE1
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#undef DTRACE_PROBE1
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#endif /* DTRACE_PROBE1 */
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#define DTRACE_PROBE1(a, b, c) ((void)0)
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#ifdef DTRACE_PROBE2
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#undef DTRACE_PROBE2
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#endif /* DTRACE_PROBE2 */
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#define DTRACE_PROBE2(a, b, c, d, e) ((void)0)
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#ifdef DTRACE_PROBE3
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#undef DTRACE_PROBE3
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#endif /* DTRACE_PROBE3 */
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#define DTRACE_PROBE3(a, b, c, d, e, f, g) ((void)0)
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#ifdef DTRACE_PROBE4
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#undef DTRACE_PROBE4
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#endif /* DTRACE_PROBE4 */
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#define DTRACE_PROBE4(a, b, c, d, e, f, g, h, i) ((void)0)
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/* Missing globals */
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extern char spl_version[16];
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extern long spl_hostid;
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extern char hw_serial[11];
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extern int p0;
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/* Missing misc functions */
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extern int highbit(unsigned long i);
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extern uint32_t zone_get_hostid(void *zone);
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extern void spl_setup(void);
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extern void spl_cleanup(void);
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#define makedevice(maj,min) makedev(maj,min)
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/* common macros */
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#ifndef MIN
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#define MIN(a, b) ((a) < (b) ? (a) : (b))
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#endif
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#ifndef MAX
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#define MAX(a, b) ((a) < (b) ? (b) : (a))
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#endif
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#ifndef ABS
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#define ABS(a) ((a) < 0 ? -(a) : (a))
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#endif
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#ifndef DIV_ROUND_UP
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#define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
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#endif
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#ifndef roundup
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#define roundup(x, y) ((((x) + ((y) - 1)) / (y)) * (y))
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#endif
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/*
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* Compatibility macros/typedefs needed for Solaris -> Linux port
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*/
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#define P2ALIGN(x, align) ((x) & -(align))
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#define P2CROSS(x, y, align) (((x) ^ (y)) > (align) - 1)
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#define P2ROUNDUP(x, align) (-(-(x) & -(align)))
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#define P2PHASE(x, align) ((x) & ((align) - 1))
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#define P2NPHASE(x, align) (-(x) & ((align) - 1))
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#define ISP2(x) (((x) & ((x) - 1)) == 0)
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#define IS_P2ALIGNED(v, a) ((((uintptr_t)(v)) & ((uintptr_t)(a) - 1)) == 0)
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#define P2BOUNDARY(off, len, align) \
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(((off) ^ ((off) + (len) - 1)) > (align) - 1)
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/*
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* Typed version of the P2* macros. These macros should be used to ensure
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* that the result is correctly calculated based on the data type of (x),
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* which is passed in as the last argument, regardless of the data
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* type of the alignment. For example, if (x) is of type uint64_t,
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* and we want to round it up to a page boundary using "PAGESIZE" as
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* the alignment, we can do either
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* P2ROUNDUP(x, (uint64_t)PAGESIZE)
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* or
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* P2ROUNDUP_TYPED(x, PAGESIZE, uint64_t)
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*/
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#define P2ALIGN_TYPED(x, align, type) \
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((type)(x) & -(type)(align))
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#define P2PHASE_TYPED(x, align, type) \
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((type)(x) & ((type)(align) - 1))
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#define P2NPHASE_TYPED(x, align, type) \
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(-(type)(x) & ((type)(align) - 1))
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#define P2ROUNDUP_TYPED(x, align, type) \
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(-(-(type)(x) & -(type)(align)))
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#define P2END_TYPED(x, align, type) \
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(-(~(type)(x) & -(type)(align)))
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#define P2PHASEUP_TYPED(x, align, phase, type) \
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((type)(phase) - (((type)(phase) - (type)(x)) & -(type)(align)))
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#define P2CROSS_TYPED(x, y, align, type) \
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(((type)(x) ^ (type)(y)) > (type)(align) - 1)
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#define P2SAMEHIGHBIT_TYPED(x, y, type) \
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(((type)(x) ^ (type)(y)) < ((type)(x) & (type)(y)))
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#if defined(_KERNEL) && !defined(_KMEMUSER) && !defined(offsetof)
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/* avoid any possibility of clashing with <stddef.h> version */
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#define offsetof(s, m) ((size_t)(&(((s *)0)->m)))
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif /* _SPL_SYSMACROS_H */
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