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Message-ID: <YwY+1xD52ep54M3y@dev-arch.thelio-3990X>
Date: Wed, 24 Aug 2022 08:08:07 -0700
From: Nathan Chancellor <nathan@...nel.org>
To: Rolf Eike Beer <eb@...ix.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
linux-kernel@...r.kernel.org,
Dan Carpenter <dan.carpenter@...cle.com>
Subject: Re: [PATCH 7/6] mm: pagewalk: add back missing variable
initializations
On Wed, Aug 24, 2022 at 01:00:11PM +0200, Rolf Eike Beer wrote:
> These initializations accidentially got lost during refactoring.
>
> The first one can't actually be used without initialization, because
> walk_p4d_range() is only called when one of the 4 callbacks is set, but relying
> on this seems fragile.
>
> Reported-by: Linux Kernel Functional Testing <lkft@...aro.org>
> Reported-by: kernel test robot <lkp@...el.com>
> Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
> Signed-off-by: Rolf Eike Beer <eb@...ix.com>
Reviewed-by: Nathan Chancellor <nathan@...nel.org>
> ---
> mm/pagewalk.c | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
>
> Looks like my testing had just the right callbacks set so I never hit this. In
> case you want to have this squashed into the original one just drop me a note
> and I'll redo the whole series.
>
> diff --git a/mm/pagewalk.c b/mm/pagewalk.c
> index d8be8a30b272..22e4bcca9bee 100644
> --- a/mm/pagewalk.c
> +++ b/mm/pagewalk.c
> @@ -223,7 +223,7 @@ static int walk_p4d_range(pgd_t *pgd, unsigned long addr, unsigned long end,
>
> p4d = p4d_offset(pgd, addr);
> do {
> - int err;
> + int err = 0;
>
> next = p4d_addr_end(addr, end);
> if (p4d_none_or_clear_bad(p4d)) {
> @@ -262,7 +262,7 @@ static int walk_pgd_range(unsigned long addr, unsigned long end,
> else
> pgd = pgd_offset(walk->mm, addr);
> do {
> - int err;
> + int err = 0;
>
> next = pgd_addr_end(addr, end);
> if (pgd_none_or_clear_bad(pgd)) {
> @@ -308,7 +308,7 @@ static int walk_hugetlb_range(unsigned long addr, unsigned long end,
> const struct mm_walk_ops *ops = walk->ops;
>
> for (; addr < end; addr = next) {
> - int err;
> + int err = 0;
> pte_t *pte = huge_pte_offset(walk->mm, addr & hmask, sz);
>
> next = hugetlb_entry_end(h, addr, end);
> --
> 2.37.2
>
> --
> Rolf Eike Beer, emlix GmbH, https://www.emlix.com
> Fon +49 551 30664-0, Fax +49 551 30664-11
> Gothaer Platz 3, 37083 Göttingen, Germany
> Sitz der Gesellschaft: Göttingen, Amtsgericht Göttingen HR B 3160
> Geschäftsführung: Heike Jordan, Dr. Uwe Kracke – Ust-IdNr.: DE 205 198 055
>
> emlix - smart embedded open source
>
>
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