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arch: mm: do not invoke OOM killer on kernel fault OOM

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Kernel faults are expected to handle OOM conditions gracefully (gup,
uaccess etc.), so they should never invoke the OOM killer.  Reserve this
for faults triggered in user context when it is the only option.

Most architectures already do this, fix up the remaining few.

Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Reviewed-by: Michal Hocko <mhocko@suse.cz>
Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: David Rientjes <rientjes@google.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: azurIt <azurit@pobox.sk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Johannes Weiner 2013-09-12 15:13:38 -07:00 committed by Linus Torvalds
parent 94bce453c7
commit 871341023c
6 changed files with 26 additions and 22 deletions
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14
arch/arm/mm/fault.c
View File

@ -349,6 +349,13 @@ do_page_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
if (likely(!(fault & (VM_FAULT_ERROR | VM_FAULT_BADMAP | VM_FAULT_BADACCESS))))
return 0;
/*
* If we are in kernel mode at this point, we
* have no context to handle this fault with.
*/
if (!user_mode(regs))
goto no_context;
if (fault & VM_FAULT_OOM) {
/*
* We ran out of memory, call the OOM killer, and return to
@ -359,13 +366,6 @@ do_page_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
return 0;
}
/*
* If we are in kernel mode at this point, we
* have no context to handle this fault with.
*/
if (!user_mode(regs))
goto no_context;
if (fault & VM_FAULT_SIGBUS) {
/*
* We had some memory, but were unable to

14
arch/arm64/mm/fault.c
View File

@ -288,6 +288,13 @@ static int __kprobes do_page_fault(unsigned long addr, unsigned int esr,
VM_FAULT_BADACCESS))))
return 0;
/*
* If we are in kernel mode at this point, we have no context to
* handle this fault with.
*/
if (!user_mode(regs))
goto no_context;
if (fault & VM_FAULT_OOM) {
/*
* We ran out of memory, call the OOM killer, and return to
@ -298,13 +305,6 @@ static int __kprobes do_page_fault(unsigned long addr, unsigned int esr,
return 0;
}
/*
* If we are in kernel mode at this point, we have no context to
* handle this fault with.
*/
if (!user_mode(regs))
goto no_context;
if (fault & VM_FAULT_SIGBUS) {
/*
* We had some memory, but were unable to successfully fix up

2
arch/avr32/mm/fault.c
View File

@ -228,9 +228,9 @@ asmlinkage void do_page_fault(unsigned long ecr, struct pt_regs *regs)
*/
out_of_memory:
up_read(&mm->mmap_sem);
pagefault_out_of_memory();
if (!user_mode(regs))
goto no_context;
pagefault_out_of_memory();
return;
do_sigbus:

2
arch/mips/mm/fault.c
View File

@ -241,6 +241,8 @@ static void __kprobes __do_page_fault(struct pt_regs *regs, unsigned long write,
* (which will retry the fault, or kill us if we got oom-killed).
*/
up_read(&mm->mmap_sem);
if (!user_mode(regs))
goto no_context;
pagefault_out_of_memory();
return;

2
arch/um/kernel/trap.c
View File

@ -124,6 +124,8 @@ int handle_page_fault(unsigned long address, unsigned long ip,
* (which will retry the fault, or kill us if we got oom-killed).
*/
up_read(&mm->mmap_sem);
if (!is_user)
goto out_nosemaphore;
pagefault_out_of_memory();
return 0;
}

14
arch/unicore32/mm/fault.c
View File

@ -278,6 +278,13 @@ static int do_pf(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
(VM_FAULT_ERROR | VM_FAULT_BADMAP | VM_FAULT_BADACCESS))))
return 0;
/*
* If we are in kernel mode at this point, we
* have no context to handle this fault with.
*/
if (!user_mode(regs))
goto no_context;
if (fault & VM_FAULT_OOM) {
/*
* We ran out of memory, call the OOM killer, and return to
@ -288,13 +295,6 @@ static int do_pf(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
return 0;
}
/*
* If we are in kernel mode at this point, we
* have no context to handle this fault with.
*/
if (!user_mode(regs))
goto no_context;
if (fault & VM_FAULT_SIGBUS) {
/*
* We had some memory, but were unable to