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Date: Sat, 29 Aug 2009 15:28:03 +0100 From: Catalin Marinas <catalin.marinas@....com> To: Ingo Molnar <mingo@...e.hu> Cc: x86@...nel.org, linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com> Subject: Re: [PATCH 1/2] kmemleak: Inform kmemleak about kernel stack allocation On Sat, 2009-08-29 at 15:29 +0200, Ingo Molnar wrote: > * Catalin Marinas <catalin.marinas@....com> wrote: > > > Traversing all the tasks in the system for scanning the kernel > > stacks requires locking which increases the kernel latency > > considerably. This patch informs kmemleak about newly allocated or > > freed stacks so that they are treated as any other allocated > > object. Subsequent patch will remove the explicit stack scanning > > from mm/kmemleak.c. > > > > Signed-off-by: Catalin Marinas <catalin.marinas@....com> > > Cc: Ingo Molnar <mingo@...hat.com> > > --- > > arch/x86/include/asm/thread_info.h | 7 ++++++- > > arch/x86/kernel/process.c | 2 ++ > > kernel/fork.c | 7 ++++++- > > 3 files changed, 14 insertions(+), 2 deletions(-) > > > > diff --git a/arch/x86/include/asm/thread_info.h b/arch/x86/include/asm/thread_info.h > > index fad7d40..f26432a 100644 > > --- a/arch/x86/include/asm/thread_info.h > > +++ b/arch/x86/include/asm/thread_info.h > > @@ -162,7 +162,12 @@ struct thread_info { > > #define __HAVE_ARCH_THREAD_INFO_ALLOCATOR > > > > #define alloc_thread_info(tsk) \ > > - ((struct thread_info *)__get_free_pages(THREAD_FLAGS, THREAD_ORDER)) > > +({ \ > > + struct thread_info *ti = (struct thread_info *) \ > > + __get_free_pages(THREAD_FLAGS, THREAD_ORDER); \ > > + kmemleak_alloc(ti, THREAD_SIZE, 1, THREAD_FLAGS); \ > > + ti; \ > > +}) > > Sidenote:this used to be a trivial wrapper to gfp so it was > borderline OK as a CPP macro - now it's a non-trivial CPP wrapper > macro which is not OK. Mind converting it to an inline function? I tried this first but got compilation errors in files that didn't even call this function. To make it workable, thread_info.h would need to include additional headers. If that's acceptable, I can post an updated patch. Thanks. -- Catalin -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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