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| author | Kautuk Consul <consul.kautuk@gmail.com> | 2012-04-02 18:19:49 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2012-04-10 09:27:42 +0100 |
| commit | dff2aa7af8c96a11f75d858859f0e0c78b193d12 (patch) | |
| tree | 3b88ae41a4d4571a48d03ad90c8955f3fffec77e /arch | |
| parent | 258f742635360175564e9470eb060ff4d4b984e7 (diff) | |
| download | lwn-dff2aa7af8c96a11f75d858859f0e0c78b193d12.tar.gz lwn-dff2aa7af8c96a11f75d858859f0e0c78b193d12.zip | |
ARM: 7368/1: fault.c: correct how the tsk->[maj|min]_flt gets incremented
commit 8878a539ff19a43cf3729e7562cd528f490246ae was done by me
to make the page fault handler retryable as well as interruptible.
Due to this commit, there is a mistake in the way in which
tsk->[maj|min]_flt counter gets incremented for VM_FAULT_ERROR:
If VM_FAULT_ERROR is returned in the fault flags by handle_mm_fault,
then either maj_flt or min_flt will get incremented. This is wrong
as in the case of a VM_FAULT_ERROR we need to be skip ahead to the
error handling code in do_page_fault.
Added a check after the call to __do_page_fault() to check for
(fault & VM_FAULT_ERROR).
Signed-off-by: Kautuk Consul <consul.kautuk@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/mm/fault.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm/mm/fault.c b/arch/arm/mm/fault.c index 9055b5a84ec5..f07467533365 100644 --- a/arch/arm/mm/fault.c +++ b/arch/arm/mm/fault.c @@ -320,7 +320,7 @@ retry: */ perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, regs, addr); - if (flags & FAULT_FLAG_ALLOW_RETRY) { + if (!(fault & VM_FAULT_ERROR) && flags & FAULT_FLAG_ALLOW_RETRY) { if (fault & VM_FAULT_MAJOR) { tsk->maj_flt++; perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MAJ, 1, |