mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-11 21:14:07 +08:00
ca79b0c211
totalram_pages and totalhigh_pages are made static inline function. Main motivation was that managed_page_count_lock handling was complicating things. It was discussed in length here, https://lore.kernel.org/patchwork/patch/995739/#1181785 So it seemes better to remove the lock and convert variables to atomic, with preventing poteintial store-to-read tearing as a bonus. [akpm@linux-foundation.org: coding style fixes] Link: http://lkml.kernel.org/r/1542090790-21750-4-git-send-email-arunks@codeaurora.org Signed-off-by: Arun KS <arunks@codeaurora.org> Suggested-by: Michal Hocko <mhocko@suse.com> Suggested-by: Vlastimil Babka <vbabka@suse.cz> Reviewed-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru> Reviewed-by: Pavel Tatashin <pasha.tatashin@soleen.com> Acked-by: Michal Hocko <mhocko@suse.com> Acked-by: Vlastimil Babka <vbabka@suse.cz> Cc: David Hildenbrand <david@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
92 lines
3.0 KiB
C
92 lines
3.0 KiB
C
/*
|
|
* malloc.h - NTFS kernel memory handling. Part of the Linux-NTFS project.
|
|
*
|
|
* Copyright (c) 2001-2005 Anton Altaparmakov
|
|
*
|
|
* This program/include file is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License as published
|
|
* by the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program/include file is distributed in the hope that it will be
|
|
* useful, but WITHOUT ANY WARRANTY; without even the implied warranty
|
|
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program (in the main directory of the Linux-NTFS
|
|
* distribution in the file COPYING); if not, write to the Free Software
|
|
* Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
|
|
#ifndef _LINUX_NTFS_MALLOC_H
|
|
#define _LINUX_NTFS_MALLOC_H
|
|
|
|
#include <linux/vmalloc.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/highmem.h>
|
|
|
|
/**
|
|
* __ntfs_malloc - allocate memory in multiples of pages
|
|
* @size: number of bytes to allocate
|
|
* @gfp_mask: extra flags for the allocator
|
|
*
|
|
* Internal function. You probably want ntfs_malloc_nofs()...
|
|
*
|
|
* Allocates @size bytes of memory, rounded up to multiples of PAGE_SIZE and
|
|
* returns a pointer to the allocated memory.
|
|
*
|
|
* If there was insufficient memory to complete the request, return NULL.
|
|
* Depending on @gfp_mask the allocation may be guaranteed to succeed.
|
|
*/
|
|
static inline void *__ntfs_malloc(unsigned long size, gfp_t gfp_mask)
|
|
{
|
|
if (likely(size <= PAGE_SIZE)) {
|
|
BUG_ON(!size);
|
|
/* kmalloc() has per-CPU caches so is faster for now. */
|
|
return kmalloc(PAGE_SIZE, gfp_mask & ~__GFP_HIGHMEM);
|
|
/* return (void *)__get_free_page(gfp_mask); */
|
|
}
|
|
if (likely((size >> PAGE_SHIFT) < totalram_pages()))
|
|
return __vmalloc(size, gfp_mask, PAGE_KERNEL);
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* ntfs_malloc_nofs - allocate memory in multiples of pages
|
|
* @size: number of bytes to allocate
|
|
*
|
|
* Allocates @size bytes of memory, rounded up to multiples of PAGE_SIZE and
|
|
* returns a pointer to the allocated memory.
|
|
*
|
|
* If there was insufficient memory to complete the request, return NULL.
|
|
*/
|
|
static inline void *ntfs_malloc_nofs(unsigned long size)
|
|
{
|
|
return __ntfs_malloc(size, GFP_NOFS | __GFP_HIGHMEM);
|
|
}
|
|
|
|
/**
|
|
* ntfs_malloc_nofs_nofail - allocate memory in multiples of pages
|
|
* @size: number of bytes to allocate
|
|
*
|
|
* Allocates @size bytes of memory, rounded up to multiples of PAGE_SIZE and
|
|
* returns a pointer to the allocated memory.
|
|
*
|
|
* This function guarantees that the allocation will succeed. It will sleep
|
|
* for as long as it takes to complete the allocation.
|
|
*
|
|
* If there was insufficient memory to complete the request, return NULL.
|
|
*/
|
|
static inline void *ntfs_malloc_nofs_nofail(unsigned long size)
|
|
{
|
|
return __ntfs_malloc(size, GFP_NOFS | __GFP_HIGHMEM | __GFP_NOFAIL);
|
|
}
|
|
|
|
static inline void ntfs_free(void *addr)
|
|
{
|
|
kvfree(addr);
|
|
}
|
|
|
|
#endif /* _LINUX_NTFS_MALLOC_H */
|