linux-kernel - Re: [ammarfaizi2-block:akpm/mm/mm-unstable 146/162] include/linux/memremap.h:258:9: error: expression which evaluates to zero treated as a null pointer constant of type 'struct folio *'

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Message-Id: <20221022163356.f5e08eeefe66fc71845be861@linux-foundation.org>
Date:   Sat, 22 Oct 2022 16:33:56 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     kernel test robot <lkp@...el.com>
Cc:     Dan Williams <dan.j.williams@...el.com>, llvm@...ts.linux.dev,
        kbuild-all@...ts.01.org, Ammar Faizi <ammarfaizi2@...weeb.org>,
        GNU/Weeb Mailing List <gwml@...r.gnuweeb.org>,
        linux-kernel@...r.kernel.org,
        Linux Memory Management List <linux-mm@...ck.org>
Subject: Re: [ammarfaizi2-block:akpm/mm/mm-unstable 146/162]
 include/linux/memremap.h:258:9: error: expression which evaluates to zero
 treated as a null pointer constant of type 'struct folio *'

On Sat, 22 Oct 2022 13:27:19 +0800 kernel test robot <lkp@...el.com> wrote:

>    In file included from include/linux/mm.h:31:
> >> include/linux/memremap.h:258:9: error: expression which evaluates to zero treated as a null pointer constant of type 'struct folio *' [-Werror,-Wnon-literal-null-conversion]
>            return false;

Thanks.  Doh.

--- a/include/linux/memremap.h~mm-memremap-introduce-pgmap_request_folio-using-pgmap-offsets-fix
+++ a/include/linux/memremap.h
@@ -255,7 +255,7 @@ static inline struct dev_pagemap *get_de
 static inline struct folio *pgmap_request_folio(struct dev_pagemap *pgmap,
 						pgoff_t pgmap_offset, int order)
 {
-	return false;
+	return NULL;
 }
 
 static inline bool pgmap_pfn_valid(struct dev_pagemap *pgmap, unsigned long pfn)
_