[{"id":3679607,"web_url":"http://patchwork.ozlabs.org/comment/3679607/","msgid":"<20260420212411.GA2260299@ax162>","list_archive_url":null,"date":"2026-04-20T21:24:11","subject":"Re: [PATCH 7/8] smb: client: compress: add compress/common.h","submitter":{"id":81040,"url":"http://patchwork.ozlabs.org/api/people/81040/","name":"Nathan Chancellor","email":"nathan@kernel.org"},"content":"Hi Enzo,\n\nOn Mon, Apr 13, 2026 at 04:07:12PM -0300, Enzo Matsumiya wrote:\n> Add compress/common.h to aggregate helpers and definitions that will be\n> shared with other compression algorithms.\n> \n> Also add a few build time checks for proper support.\n> \n> Changes:\n> - update affected call paths in compress/lz77.c\n> \n> Signed-off-by: Enzo Matsumiya \n> ---\n...\n> diff --git a/fs/smb/client/compress/common.h b/fs/smb/client/compress/common.h\n> new file mode 100644\n> index 000000000000..b5ccf5debd22\n> --- /dev/null\n> +++ b/fs/smb/client/compress/common.h\n...\n> +/*\n> + * Build time checks/asserts.\n> + * These are assumptions/expectations for all algorithms implemented.\n> + */\n> +#ifndef __LITTLE_ENDIAN /* TODO */\n> +# error \"SMB3 compression is only supported on little endian architectures\"\n> +#endif /* !__LITTLE_ENDIAN */\n> +\n> +#if BITS_PER_LONG < 64 /* TODO */\n> +# error \"SMB3 compression is only supported on 64-bit architectures\"\n> +#endif /* BITS_PER_LONG < 64 */\n> +\n> +/* Build time double checks (probably unnecessary) */\n> +static_assert(sizeof(u16) == 2);\n> +static_assert(sizeof(u32) == 4);\n> +static_assert(sizeof(u64) == 8);\n> +static_assert(sizeof(size_t) == 8);\n\nSteve pushed this change into -next as commit 20a248d5e77a (\"smb:\nclient: compress: add compress/common.h\"), where it breaks the build for\nmany 32-bit architectures for obvious reasons:\n\n $ make -skj\"$(nproc)\" ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- mrproper allmodconfig fs/smb/\n In file included from fs/smb/client/compress/lz77.c:14:\n fs/smb/client/compress/common.h:34:3: error: #error \"SMB3 compression is only supported on 64-bit architectures\"\n 34 | # error \"SMB3 compression is only supported on 64-bit architectures\"\n | ^~~~~\n In file included from include/linux/init.h:5,\n from include/linux/printk.h:6,\n from include/asm-generic/bug.h:31,\n from arch/arm/include/asm/bug.h:60,\n from include/linux/bug.h:5,\n from include/linux/slab.h:15,\n from fs/smb/client/compress/lz77.c:9:\n include/linux/build_bug.h:80:41: error: static assertion failed: \"sizeof(size_t) == 8\"\n 80 | #define __static_assert(expr, msg, ...) _Static_assert(expr, msg)\n | ^~~~~~~~~~~~~~\n include/linux/build_bug.h:79:34: note: in expansion of macro '__static_assert'\n 79 | #define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)\n | ^~~~~~~~~~~~~~~\n fs/smb/client/compress/common.h:41:1: note: in expansion of macro 'static_assert'\n 41 | static_assert(sizeof(size_t) == 8);\n | ^~~~~~~~~~~~~\n\nIt is unacceptable for the build to break in this manner in my opinion.\nYou should really use Kconfig to gate this code in a proper manner and\nnot emit any errors or warnings when it is unsupported.\n\nCheers,\nNathan","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-cifs@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256\n header.s=k20201202 header.b=Z3FnydJq;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c09:e001:a7::12fc:5321; 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arc=none smtp.client-ip=10.30.226.201","DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org;\n\ts=k20201202; t=1776720255;\n\tbh=cfZGeZ7aBcHxMo4XJe8v9HRyfwvKCXMx/aCJy19G1tM=;\n\th=Date:From:To:Cc:Subject:References:In-Reply-To:From;\n\tb=Z3FnydJqet3QokKCcfBi9/4ZTnMWnT56XzkuAQutyfuM8nkprtQw7YDlrEOUIpV/M\n\t 9jm0WSUGBNarRM/+mGFLFkoaswH2syDbgdNBW44g3pTnyxhkFCS83YhIvuazk6rMl0\n\t Haq0Ii0Hq22pFVTzR35ozJ+lWiJn+I7+C3gG4oTJOr5iPwLi0mqZapNRq74tguL1wt\n\t DtqmA3/bCl51LEsBtjUzPToSIb53XAArhkpdf1r905li701kMrQUyOKwFK6c9QWcML\n\t vKy8AxJXPzPPC+mo+EQ/GI3M8fDMT8P9ScNGzLMyDZQJHsZxZihFoi6UduwmRKqyzA\n\t Msso8EcxsXgCA==","Date":"Mon, 20 Apr 2026 14:24:11 -0700","From":"Nathan Chancellor ","To":"Enzo Matsumiya ","Cc":"linux-cifs@vger.kernel.org, smfrench@gmail.com, pc@manguebit.com,\n\tronniesahlberg@gmail.com, sprasad@microsoft.com, tom@talpey.com,\n\tbharathsm@microsoft.com, henrique.carvalho@suse.com","Subject":"Re: [PATCH 7/8] smb: client: compress: add compress/common.h","Message-ID":"<20260420212411.GA2260299@ax162>","References":"<20260413190713.283939-1-ematsumiya@suse.de>\n <20260413190713.283939-7-ematsumiya@suse.de>","Precedence":"bulk","X-Mailing-List":"linux-cifs@vger.kernel.org","List-Id":"","List-Subscribe":"","List-Unsubscribe":"","MIME-Version":"1.0","Content-Type":"text/plain; charset=us-ascii","Content-Disposition":"inline","In-Reply-To":"<20260413190713.283939-7-ematsumiya@suse.de>"}},{"id":3679610,"web_url":"http://patchwork.ozlabs.org/comment/3679610/","msgid":"","list_archive_url":null,"date":"2026-04-20T21:31:22","subject":"Re: [PATCH 7/8] smb: client: compress: add compress/common.h","submitter":{"id":510,"url":"http://patchwork.ozlabs.org/api/people/510/","name":"Steve French","email":"smfrench@gmail.com"},"content":"On Mon, Apr 20, 2026 at 4:24 PM Nathan Chancellor wrote:\n>\n> Hi Enzo,\n>\n> On Mon, Apr 13, 2026 at 04:07:12PM -0300, Enzo Matsumiya wrote:\n> > Add compress/common.h to aggregate helpers and definitions that will be\n> > shared with other compression algorithms.\n> >\n> > Also add a few build time checks for proper support.\n> >\n> > Changes:\n> > - update affected call paths in compress/lz77.c\n> >\n> > Signed-off-by: Enzo Matsumiya \n> > ---\n> ...\n> > diff --git a/fs/smb/client/compress/common.h b/fs/smb/client/compress/common.h\n> > new file mode 100644\n> > index 000000000000..b5ccf5debd22\n> > --- /dev/null\n> > +++ b/fs/smb/client/compress/common.h\n> ...\n> > +/*\n> > + * Build time checks/asserts.\n> > + * These are assumptions/expectations for all algorithms implemented.\n> > + */\n> > +#ifndef __LITTLE_ENDIAN /* TODO */\n> > +# error \"SMB3 compression is only supported on little endian architectures\"\n> > +#endif /* !__LITTLE_ENDIAN */\n> > +\n> > +#if BITS_PER_LONG < 64 /* TODO */\n> > +# error \"SMB3 compression is only supported on 64-bit architectures\"\n> > +#endif /* BITS_PER_LONG < 64 */\n> > +\n> > +/* Build time double checks (probably unnecessary) */\n> > +static_assert(sizeof(u16) == 2);\n> > +static_assert(sizeof(u32) == 4);\n> > +static_assert(sizeof(u64) == 8);\n> > +static_assert(sizeof(size_t) == 8);\n>\n> Steve pushed this change into -next as commit 20a248d5e77a (\"smb:\n> client: compress: add compress/common.h\"), where it breaks the build for\n> many 32-bit architectures for obvious reasons:\n>\n> $ make -skj\"$(nproc)\" ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- mrproper allmodconfig fs/smb/\n> In file included from fs/smb/client/compress/lz77.c:14:\n> fs/smb/client/compress/common.h:34:3: error: #error \"SMB3 compression is only supported on 64-bit architectures\"\n> 34 | # error \"SMB3 compression is only supported on 64-bit architectures\"\n> | ^~~~~\n> In file included from include/linux/init.h:5,\n> from include/linux/printk.h:6,\n> from include/asm-generic/bug.h:31,\n> from arch/arm/include/asm/bug.h:60,\n> from include/linux/bug.h:5,\n> from include/linux/slab.h:15,\n> from fs/smb/client/compress/lz77.c:9:\n> include/linux/build_bug.h:80:41: error: static assertion failed: \"sizeof(size_t) == 8\"\n> 80 | #define __static_assert(expr, msg, ...) _Static_assert(expr, msg)\n> | ^~~~~~~~~~~~~~\n> include/linux/build_bug.h:79:34: note: in expansion of macro '__static_assert'\n> 79 | #define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)\n> | ^~~~~~~~~~~~~~~\n> fs/smb/client/compress/common.h:41:1: note: in expansion of macro 'static_assert'\n> 41 | static_assert(sizeof(size_t) == 8);\n> | ^~~~~~~~~~~~~\n>\n> It is unacceptable for the build to break in this manner in my opinion.\n> You should really use Kconfig to gate this code in a proper manner and\n> not emit any errors or warnings when it is unsupported.\n>\n\nThx for pointing this out. I have removed the patch from cifs-2.6.git for-next\n\nLet me know if you spot any additional problems","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-cifs@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=bcJYXi6r;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=172.234.253.10; helo=sea.lore.kernel.org;\n envelope-from=linux-cifs+bounces-10972-incoming=patchwork.ozlabs.org@vger.kernel.org;\n receiver=patchwork.ozlabs.org)","smtp.subspace.kernel.org;\n\tdkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com\n header.b=\"bcJYXi6r\"","smtp.subspace.kernel.org;\n arc=pass smtp.client-ip=209.85.219.53","smtp.subspace.kernel.org;\n dmarc=pass (p=none dis=none) header.from=gmail.com","smtp.subspace.kernel.org;\n spf=pass smtp.mailfrom=gmail.com"],"Received":["from sea.lore.kernel.org (sea.lore.kernel.org [172.234.253.10])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519 server-signature ECDSA (secp384r1) server-digest SHA384)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4fzzNX3nVYz1yCv\n\tfor ; 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Mon, 20 Apr 2026\n 14:31:33 -0700 (PDT)","Precedence":"bulk","X-Mailing-List":"linux-cifs@vger.kernel.org","List-Id":"","List-Subscribe":"","List-Unsubscribe":"","MIME-Version":"1.0","References":"<20260413190713.283939-1-ematsumiya@suse.de>\n <20260413190713.283939-7-ematsumiya@suse.de>\n <20260420212411.GA2260299@ax162>","In-Reply-To":"<20260420212411.GA2260299@ax162>","From":"Steve French ","Date":"Mon, 20 Apr 2026 16:31:22 -0500","X-Gm-Features":"AQROBzDPVbyjRmAUUYNogTWfIG1LTgv4Hd8YQ_zgLoVtgXYWmXMe4Oyxg9qIKa0","Message-ID":"\n ","Subject":"Re: [PATCH 7/8] smb: client: compress: add compress/common.h","To":"Nathan Chancellor ","Cc":"Enzo Matsumiya , linux-cifs@vger.kernel.org,\n pc@manguebit.com,\n\tronniesahlberg@gmail.com, sprasad@microsoft.com, tom@talpey.com,\n\tbharathsm@microsoft.com, henrique.carvalho@suse.com","Content-Type":"text/plain; charset=\"UTF-8\"","Content-Transfer-Encoding":"quoted-printable"}}]