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Date: Tue, 7 May 2019 14:51:16 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@...hiba.co.jp> Cc: linux-kernel@...r.kernel.org, stable@...r.kernel.org, Catalin Marinas <catalin.marinas@....com>, Qian Cai <cai@....pw>, Paul Mackerras <paulus@...ba.org>, Benjamin Herrenschmidt <benh@...nel.crashing.org>, Avi Kivity <avi@...hat.com>, Paolo Bonzini <pbonzini@...hat.com>, Radim Krcmar <rkrcmar@...hat.com>, Andrew Morton <akpm@...ux-foundation.org>, Linus Torvalds <torvalds@...ux-foundation.org>, Sasha Levin <sashal@...nel.org>, Michael Ellerman <mpe@...erman.id.au> Subject: Re: [PATCH 4.19 62/99] kmemleak: powerpc: skip scanning holes in the .bss section On Tue, May 07, 2019 at 04:58:09PM +0900, Nobuhiro Iwamatsu wrote: > Hi, > > On Mon, May 06, 2019 at 04:32:35PM +0200, Greg Kroah-Hartman wrote: > > [ Upstream commit 298a32b132087550d3fa80641ca58323c5dfd4d9 ] > > > > Commit 2d4f567103ff ("KVM: PPC: Introduce kvm_tmp framework") adds > > kvm_tmp[] into the .bss section and then free the rest of unused spaces > > back to the page allocator. > > > > kernel_init > > kvm_guest_init > > kvm_free_tmp > > free_reserved_area > > free_unref_page > > free_unref_page_prepare > > > > With DEBUG_PAGEALLOC=y, it will unmap those pages from kernel. As the > > result, kmemleak scan will trigger a panic when it scans the .bss > > section with unmapped pages. > > > > This patch creates dedicated kmemleak objects for the .data, .bss and > > potentially .data..ro_after_init sections to allow partial freeing via > > the kmemleak_free_part() in the powerpc kvm_free_tmp() function. > > > > Link: http://lkml.kernel.org/r/20190321171917.62049-1-catalin.marinas@arm.com > > Signed-off-by: Catalin Marinas <catalin.marinas@....com> > > Reported-by: Qian Cai <cai@....pw> > > Acked-by: Michael Ellerman <mpe@...erman.id.au> (powerpc) > > Tested-by: Qian Cai <cai@....pw> > > Cc: Paul Mackerras <paulus@...ba.org> > > Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org> > > Cc: Avi Kivity <avi@...hat.com> > > Cc: Paolo Bonzini <pbonzini@...hat.com> > > Cc: Radim Krcmar <rkrcmar@...hat.com> > > Signed-off-by: Andrew Morton <akpm@...ux-foundation.org> > > Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org> > > Signed-off-by: Sasha Levin <sashal@...nel.org> > > --- > > arch/powerpc/kernel/kvm.c | 7 +++++++ > > mm/kmemleak.c | 16 +++++++++++----- > > 2 files changed, 18 insertions(+), 5 deletions(-) > > This commit has other problems, so we also need the following commits: > > commit dce5b0bdeec61bdbee56121ceb1d014151d5cab1 > Author: Arnd Bergmann <arnd@...db.de> > Date: Thu Apr 18 17:50:48 2019 -0700 > > mm/kmemleak.c: fix unused-function warning > > The only references outside of the #ifdef have been removed, so now we > get a warning in non-SMP configurations: > > mm/kmemleak.c:1404:13: error: unused function 'scan_large_block' [-Werror,-Wunused-function] > > Add a new #ifdef around it. > > Link: http://lkml.kernel.org/r/20190416123148.3502045-1-arnd@arndb.de > Fixes: 298a32b13208 ("kmemleak: powerpc: skip scanning holes in the .bss section") > Signed-off-by: Arnd Bergmann <arnd@...db.de> > Acked-by: Catalin Marinas <catalin.marinas@....com> > Cc: Vincent Whitchurch <vincent.whitchurch@...s.com> > Cc: Michael Ellerman <mpe@...erman.id.au> > Signed-off-by: Andrew Morton <akpm@...ux-foundation.org> > Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org> > > Please apply this commit. Now queued up, thanks! greg k-h
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