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mm: enhance free_reserved_area() to support poisoning memory with zero

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Address more review comments from last round of code review.
1) Enhance free_reserved_area() to support poisoning freed memory with
   pattern '0'. This could be used to get rid of poison_init_mem()
   on ARM64.
2) A previous patch has disabled memory poison for initmem on s390
   by mistake, so restore to the original behavior.
3) Remove redundant PAGE_ALIGN() when calling free_reserved_area().

Signed-off-by: Jiang Liu <[email protected]>
Cc: Geert Uytterhoeven <[email protected]>
Cc: "H. Peter Anvin" <[email protected]>
Cc: "Michael S. Tsirkin" <[email protected]>
Cc: <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Cc: Catalin Marinas <[email protected]>
Cc: Chris Metcalf <[email protected]>
Cc: David Howells <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jeremy Fitzhardinge <[email protected]>
Cc: Jianguo Wu <[email protected]>
Cc: Joonsoo Kim <[email protected]>
Cc: Kamezawa Hiroyuki <[email protected]>
Cc: Konrad Rzeszutek Wilk <[email protected]>
Cc: Marek Szyprowski <[email protected]>
Cc: Mel Gorman <[email protected]>
Cc: Michel Lespinasse <[email protected]>
Cc: Minchan Kim <[email protected]>
Cc: Rik van Riel <[email protected]>
Cc: Rusty Russell <[email protected]>
Cc: Tang Chen <[email protected]>
Cc: Tejun Heo <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Wen Congyang <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: Yasuaki Ishimatsu <[email protected]>
Cc: Yinghai Lu <[email protected]>
Cc: Russell King <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Jiang Liu 2013-07-03 15:02:51 -07:00 • committed by Linus Torvalds
commit dbe67df4ba
26 changed files with 49 additions and 53 deletions
Download patch file Download diff file Expand all files Collapse all files

2
arch/alpha/kernel/sys_nautilus.c
View file

@ -239,7 +239,7 @@ nautilus_init_pci(void)
memtop = pci_mem;
if (memtop > alpha_mv.min_mem_address) {
free_reserved_area(__va(alpha_mv.min_mem_address),
__va(memtop), 0, NULL);
__va(memtop), -1, NULL);
printk("nautilus_init_pci: %ldk freed\n",
(memtop - alpha_mv.min_mem_address) >> 10);
}

4
arch/alpha/mm/init.c
View file

@ -319,13 +319,13 @@ mem_init(void)
void
free_initmem(void)
{
free_initmem_default(0);
free_initmem_default(-1);
}
#ifdef CONFIG_BLK_DEV_INITRD
void
free_initrd_mem(unsigned long start, unsigned long end)
{
free_reserved_area((void *)start, (void *)end, 0, "initrd");
free_reserved_area((void *)start, (void *)end, -1, "initrd");
}
#endif