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MIPS: bootmem: Fix mapstart calculation for contiguous maps

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Commit a6335fa1 fixed the case with gap between initrd and next usable PFN zone,
but broken the case when initrd is combined with usable memory into one region
(in add_memory_region()). Restore the fixup initially brought in by f9a7febd.

---- error message ----
Unpacking initramfs...
Initramfs unpacking failed: junk in compressed archive
BUG: Bad page state in process swapper  pfn:00261
page:81004c20 count:0 mapcount:-127 mapping:  (null) index:0x2
flags: 0x0()
page dumped because: nonzero mapcount
CPU: 0 PID: 1 Comm: swapper Not tainted 4.2.0+ #1782
-----------------------

Signed-off-by: Alexander Sverdlin <alexander.sverdlin@gmail.com>
Reported-by: Tony Wu <tung7970@gmail.com>
Tested-by: Tony Wu <tung7970@gmail.com>
Cc: David Daney <david.daney@cavium.com>
Cc: Zubair Lutfullah Kakakhel <Zubair.Kakakhel@imgtec.com>
Cc: Huacai Chen <chenhc@lemote.com>
Cc: Joe Perches <joe@perches.com>
Cc: Steven J. Hill <Steven.Hill@imgtec.com>
Cc: Aaro Koskinen <aaro.koskinen@iki.fi>
Cc: stable@vger.kernel.org
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/11086/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Alexander Sverdlin 2015-09-03 08:36:35 +02:00 committed by Ralf Baechle
parent fc2ca67447
commit 88d3426942
1 changed files with 9 additions and 1 deletions
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10
arch/mips/kernel/setup.c
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@ -338,7 +338,7 @@ static void __init bootmem_init(void)
if (end <= reserved_end)
continue;
#ifdef CONFIG_BLK_DEV_INITRD
/* mapstart should be after initrd_end */
/* Skip zones before initrd and initrd itself */
if (initrd_end && end <= (unsigned long)PFN_UP(__pa(initrd_end)))
continue;
#endif
@ -371,6 +371,14 @@ static void __init bootmem_init(void)
max_low_pfn = PFN_DOWN(HIGHMEM_START);
}
#ifdef CONFIG_BLK_DEV_INITRD
/*
* mapstart should be after initrd_end
*/
if (initrd_end)
mapstart = max(mapstart, (unsigned long)PFN_UP(__pa(initrd_end)));
#endif
/*
* Initialize the boot-time allocator with low memory only.
*/