diff options
| author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2015-04-16 14:47:33 +0200 |
|---|---|---|
| committer | Jiri Slaby <jslaby@suse.cz> | 2015-08-04 16:51:58 +0200 |
| commit | 6c1ad037a144bb56db6e70b00a4108ce7ff7c950 (patch) | |
| tree | d80651feedca13d94f5ddf98ccbb5cbaae6b864f | |
| parent | cbe04187a6cac63ce4c6277b9759d370de68cb00 (diff) | |
kexec: allocate the kexec control page with KEXEC_CONTROL_MEMORY_GFP
commit 7e01b5acd88b3f3108d8c4ce44e3205d67437202 upstream.
Introduce KEXEC_CONTROL_MEMORY_GFP to allow the architecture code
to override the gfp flags of the allocation for the kexec control
page. The loop in kimage_alloc_normal_control_pages allocates pages
with GFP_KERNEL until a page is found that happens to have an
address smaller than the KEXEC_CONTROL_MEMORY_LIMIT. On systems
with a large memory size but a small KEXEC_CONTROL_MEMORY_LIMIT
the loop will keep allocating memory until the oom killer steps in.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
| -rw-r--r-- | arch/s390/include/asm/kexec.h | 3 | ||||
| -rw-r--r-- | include/linux/kexec.h | 4 | ||||
| -rw-r--r-- | kernel/kexec.c | 2 |
3 files changed, 8 insertions, 1 deletions
diff --git a/arch/s390/include/asm/kexec.h b/arch/s390/include/asm/kexec.h index 694bcd6bd927..2f924bc30e35 100644 --- a/arch/s390/include/asm/kexec.h +++ b/arch/s390/include/asm/kexec.h @@ -26,6 +26,9 @@ /* Not more than 2GB */ #define KEXEC_CONTROL_MEMORY_LIMIT (1UL<<31) +/* Allocate control page with GFP_DMA */ +#define KEXEC_CONTROL_MEMORY_GFP GFP_DMA + /* Maximum address we can use for the crash control pages */ #define KEXEC_CRASH_CONTROL_MEMORY_LIMIT (-1UL) diff --git a/include/linux/kexec.h b/include/linux/kexec.h index 5fd33dc1fe3a..66e3687b401b 100644 --- a/include/linux/kexec.h +++ b/include/linux/kexec.h @@ -26,6 +26,10 @@ #error KEXEC_CONTROL_MEMORY_LIMIT not defined #endif +#ifndef KEXEC_CONTROL_MEMORY_GFP +#define KEXEC_CONTROL_MEMORY_GFP GFP_KERNEL +#endif + #ifndef KEXEC_CONTROL_PAGE_SIZE #error KEXEC_CONTROL_PAGE_SIZE not defined #endif diff --git a/kernel/kexec.c b/kernel/kexec.c index 4c9dcffd1750..316216c38fb9 100644 --- a/kernel/kexec.c +++ b/kernel/kexec.c @@ -432,7 +432,7 @@ static struct page *kimage_alloc_normal_control_pages(struct kimage *image, do { unsigned long pfn, epfn, addr, eaddr; - pages = kimage_alloc_pages(GFP_KERNEL, order); + pages = kimage_alloc_pages(KEXEC_CONTROL_MEMORY_GFP, order); if (!pages) break; pfn = page_to_pfn(pages); |