From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 27C7FC2A088 for ; Mon, 5 Jan 2026 10:36:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:In-Reply-To:From:References:Cc:To:Subject:MIME-Version:Date: Message-ID:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=wLMNQCXsRqZz//ffWRWir3kRGuI90Y78E6Y8aDDWaJs=; b=u7wo/oAJ5nwbsuIG/0thzIIFm9 dSh3iHBuiKA1OGCCibGCtoCMXEGjDnd6PfipPmGxCiTZEle8aCiFufOWLJC2Mqw9llDwyfm5olzsm S+y2Tb8nthm6Q1ofnlnFsGWQICEMlLEJsn4ZBGr331oCOZV6Erj+FLjtZ8hSdWynuOTrx1nZbW+SG hbWTAY5R4mz683xslSTBT7HQsjn25eVyv/4Jr4NTIQAXyjAL8sK5hSDnnxF/65k/YCU4sKYxdsMhn YBnngtDNbUTbM8pfzErtO61BuuIkxAQWyfRfH7WYVvtRreilbvlix/Q2dg0ycF4Kp4FRi7TM+dVeJ ALSKDTlw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vchx4-0000000B7VB-3qhy; Mon, 05 Jan 2026 10:36:42 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vchx2-0000000B7UW-0phz; Mon, 05 Jan 2026 10:36:41 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 610D5497; Mon, 5 Jan 2026 02:36:32 -0800 (PST) Received: from [10.1.38.150] (XHFQ2J9959.cambridge.arm.com [10.1.38.150]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id C66F83F6A8; Mon, 5 Jan 2026 02:36:35 -0800 (PST) Message-ID: <3062af1d-48b3-4d64-8528-3470e07069bb@arm.com> Date: Mon, 5 Jan 2026 10:36:34 +0000 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 2/3] prandom: Convert prandom_u32_state() to __always_inline Content-Language: en-GB To: "Christophe Leroy (CS GROUP)" , "Jason A. Donenfeld" Cc: Catalin Marinas , Will Deacon , Huacai Chen , Madhavan Srinivasan , Michael Ellerman , Paul Walmsley , Palmer Dabbelt , Albert Ou , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , Kees Cook , "Gustavo A. R. Silva" , Arnd Bergmann , Mark Rutland , Ard Biesheuvel , Jeremy Linton , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, loongarch@lists.linux.dev, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-hardening@vger.kernel.org References: <20260102131156.3265118-1-ryan.roberts@arm.com> <20260102131156.3265118-3-ryan.roberts@arm.com> <719b7b99-3615-46cd-84d9-8b8fc21e3ce9@arm.com> <563a5d0d-c27a-45de-9495-a82403026886@kernel.org> From: Ryan Roberts In-Reply-To: <563a5d0d-c27a-45de-9495-a82403026886@kernel.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260105_023640_331881_8463041D X-CRM114-Status: GOOD ( 27.63 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 03/01/2026 08:00, Christophe Leroy (CS GROUP) wrote: > > > Le 02/01/2026 à 15:09, Ryan Roberts a écrit : >> On 02/01/2026 13:39, Jason A. Donenfeld wrote: >>> Hi Ryan, >>> >>> On Fri, Jan 2, 2026 at 2:12 PM Ryan Roberts wrote: >>>> context. Given the function is just a handful of operations and doesn't >>> >>> How many? What's this looking like in terms of assembly? >> >> 25 instructions on arm64: > > 31 instructions on powerpc: > > 00000000 : >    0:    7c 69 1b 78     mr      r9,r3 >    4:    80 63 00 00     lwz     r3,0(r3) >    8:    80 89 00 08     lwz     r4,8(r9) >    c:    81 69 00 04     lwz     r11,4(r9) >   10:    80 a9 00 0c     lwz     r5,12(r9) >   14:    54 67 30 32     slwi    r7,r3,6 >   18:    7c e7 1a 78     xor     r7,r7,r3 >   1c:    55 66 10 3a     slwi    r6,r11,2 >   20:    54 88 68 24     slwi    r8,r4,13 >   24:    54 63 90 18     rlwinm  r3,r3,18,0,12 >   28:    7d 6b 32 78     xor     r11,r11,r6 >   2c:    7d 08 22 78     xor     r8,r8,r4 >   30:    54 aa 18 38     slwi    r10,r5,3 >   34:    54 e7 9b 7e     srwi    r7,r7,13 >   38:    7c e7 1a 78     xor     r7,r7,r3 >   3c:    51 66 2e fe     rlwimi  r6,r11,5,27,31 >   40:    54 84 38 28     rlwinm  r4,r4,7,0,20 >   44:    7d 4a 2a 78     xor     r10,r10,r5 >   48:    55 08 5d 7e     srwi    r8,r8,21 >   4c:    7d 08 22 78     xor     r8,r8,r4 >   50:    7c e3 32 78     xor     r3,r7,r6 >   54:    54 a5 68 16     rlwinm  r5,r5,13,0,11 >   58:    55 4a a3 3e     srwi    r10,r10,12 >   5c:    7d 4a 2a 78     xor     r10,r10,r5 >   60:    7c 63 42 78     xor     r3,r3,r8 >   64:    90 e9 00 00     stw     r7,0(r9) >   68:    90 c9 00 04     stw     r6,4(r9) >   6c:    91 09 00 08     stw     r8,8(r9) >   70:    91 49 00 0c     stw     r10,12(r9) >   74:    7c 63 52 78     xor     r3,r3,r10 >   78:    4e 80 00 20     blr > > Among those, 8 instructions are for reading/writing the state in stack. They of > course disappear when inlining. > >> >>> It'd also be >>> nice to have some brief analysis of other call sites to have >>> confirmation this isn't blowing up other users. >> >> I compiled defconfig before and after this patch on arm64 and compared the text >> sizes: >> >> $ ./scripts/bloat-o-meter -t vmlinux.before vmlinux.after >> add/remove: 3/4 grow/shrink: 4/1 up/down: 836/-128 (708) >> Function                                     old     new   delta >> prandom_seed_full_state                      364     932    +568 >> pick_next_task_fair                         1940    2036     +96 >> bpf_user_rnd_u32                             104     196     +92 >> prandom_bytes_state                          204     260     +56 >> e843419@0f2b_00012d69_e34                      -       8      +8 >> e843419@0db7_00010ec3_23ec                     -       8      +8 >> e843419@02cb_00003767_25c                      -       8      +8 >> bpf_prog_select_runtime                      448     444      -4 >> e843419@0aa3_0000cfd1_1580                     8       -      -8 >> e843419@0aa2_0000cfba_147c                     8       -      -8 >> e843419@075f_00008d8c_184                      8       -      -8 >> prandom_u32_state                            100       -    -100 >> Total: Before=19078072, After=19078780, chg +0.00% >> >> So 708 bytes more after inlining. The main cost is prandom_seed_full_state(), >> which calls prandom_u32_state() 10 times (via prandom_warmup()). I expect we >> could turn that into a loop to reduce ~450 bytes overall. >> > With following change the increase of prandom_seed_full_state() remains > reasonnable and performance wise it is a lot better as it avoids the read/write > of the state via the stack > > diff --git a/lib/random32.c b/lib/random32.c > index 24e7acd9343f6..28a5b109c9018 100644 > --- a/lib/random32.c > +++ b/lib/random32.c > @@ -94,17 +94,11 @@ EXPORT_SYMBOL(prandom_bytes_state); > >  static void prandom_warmup(struct rnd_state *state) >  { > +    int i; > + >      /* Calling RNG ten times to satisfy recurrence condition */ > -    prandom_u32_state(state); > -    prandom_u32_state(state); > -    prandom_u32_state(state); > -    prandom_u32_state(state); > -    prandom_u32_state(state); > -    prandom_u32_state(state); > -    prandom_u32_state(state); > -    prandom_u32_state(state); > -    prandom_u32_state(state); > -    prandom_u32_state(state); > +    for (i = 0; i < 10; i++) > +        prandom_u32_state(state); >  } > >  void prandom_seed_full_state(struct rnd_state __percpu *pcpu_state) > > The loop is: > >  248:    38 e0 00 0a     li      r7,10 >  24c:    7c e9 03 a6     mtctr   r7 >  250:    55 05 30 32     slwi    r5,r8,6 >  254:    55 46 68 24     slwi    r6,r10,13 >  258:    55 27 18 38     slwi    r7,r9,3 >  25c:    7c a5 42 78     xor     r5,r5,r8 >  260:    7c c6 52 78     xor     r6,r6,r10 >  264:    7c e7 4a 78     xor     r7,r7,r9 >  268:    54 8b 10 3a     slwi    r11,r4,2 >  26c:    7d 60 22 78     xor     r0,r11,r4 >  270:    54 a5 9b 7e     srwi    r5,r5,13 >  274:    55 08 90 18     rlwinm  r8,r8,18,0,12 >  278:    54 c6 5d 7e     srwi    r6,r6,21 >  27c:    55 4a 38 28     rlwinm  r10,r10,7,0,20 >  280:    54 e7 a3 3e     srwi    r7,r7,12 >  284:    55 29 68 16     rlwinm  r9,r9,13,0,11 >  288:    7d 64 5b 78     mr      r4,r11 >  28c:    7c a8 42 78     xor     r8,r5,r8 >  290:    7c ca 52 78     xor     r10,r6,r10 >  294:    7c e9 4a 78     xor     r9,r7,r9 >  298:    50 04 2e fe     rlwimi  r4,r0,5,27,31 >  29c:    42 00 ff b4     bdnz    250 > > Which replaces the 10 calls to prandom_u32_state() > >   fc:    91 3f 00 0c     stw     r9,12(r31) >  100:    7f e3 fb 78     mr      r3,r31 >  104:    48 00 00 01     bl      104 >             104: R_PPC_REL24    prandom_u32_state >  108:    7f e3 fb 78     mr      r3,r31 >  10c:    48 00 00 01     bl      10c >             10c: R_PPC_REL24    prandom_u32_state >  110:    7f e3 fb 78     mr      r3,r31 >  114:    48 00 00 01     bl      114 >             114: R_PPC_REL24    prandom_u32_state >  118:    7f e3 fb 78     mr      r3,r31 >  11c:    48 00 00 01     bl      11c >             11c: R_PPC_REL24    prandom_u32_state >  120:    7f e3 fb 78     mr      r3,r31 >  124:    48 00 00 01     bl      124 >             124: R_PPC_REL24    prandom_u32_state >  128:    7f e3 fb 78     mr      r3,r31 >  12c:    48 00 00 01     bl      12c >             12c: R_PPC_REL24    prandom_u32_state >  130:    7f e3 fb 78     mr      r3,r31 >  134:    48 00 00 01     bl      134 >             134: R_PPC_REL24    prandom_u32_state >  138:    7f e3 fb 78     mr      r3,r31 >  13c:    48 00 00 01     bl      13c >             13c: R_PPC_REL24    prandom_u32_state >  140:    7f e3 fb 78     mr      r3,r31 >  144:    48 00 00 01     bl      144 >             144: R_PPC_REL24    prandom_u32_state >  148:    80 01 00 24     lwz     r0,36(r1) >  14c:    7f e3 fb 78     mr      r3,r31 >  150:    83 e1 00 1c     lwz     r31,28(r1) >  154:    7c 08 03 a6     mtlr    r0 >  158:    38 21 00 20     addi    r1,r1,32 >  15c:    48 00 00 00     b       15c >             15c: R_PPC_REL24    prandom_u32_state > > > So approx the same number of instructions in size, while better performance. > >> I'm not really sure if 708 is good or bad... > > That's in the noise compared to the overall size of vmlinux, but if we change it > to a loop we also reduce pressure on the cache. Thanks for the analysis; I'm going to follow David's suggestion and refactor this into both an __always_inline and an out-of-line version. That way the existing callsites can continue to use the out-of-line version and we will only use the inline version for the kstack offset randomization. Thanks, Ryan > > Christophe From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 3C6F7C2A088 for ; Mon, 5 Jan 2026 10:36:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:From:References:Cc:To: Subject:MIME-Version:Date:Message-ID:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=/Kt3KmhZxg/IgN9bskhnbXW2ThKmmvdZ2zo/irIFk7w=; b=D/Zvht8oUCpkGD 4d+m9Mjm22lVW6FpcPc97hpSUiNnVtwIkte0PA0npJb4sz/iBZJdx9zbUF9hB22mBmqiKNVQaU8bA xIgGHAo18geBC2J5ZlAolbn3lUumNzxPBOoGg4RcD8A4Ym3ziJSaBwDV1j/Vb0Yr6K8XLhMlLhT3R 0J6NN/zECU0rSuTDbxPKYxPRJvDjcu7SsesZsr5DZ90eeTJMwc761do/mKuZxOZ+74oMc2MbPUmXS cWlHrFp7gl588X+I6o8F6l6csMOH/Tsm89s/d6lv2Zgx4F/yY1VgwEAyg8xf6yK/I3JVIcP+6YdLt 2yt07VzkVVwzyt/0qC7Q==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vchx5-0000000B7VT-12kj; Mon, 05 Jan 2026 10:36:43 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vchx2-0000000B7UW-0phz; Mon, 05 Jan 2026 10:36:41 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 610D5497; Mon, 5 Jan 2026 02:36:32 -0800 (PST) Received: from [10.1.38.150] (XHFQ2J9959.cambridge.arm.com [10.1.38.150]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id C66F83F6A8; Mon, 5 Jan 2026 02:36:35 -0800 (PST) Message-ID: <3062af1d-48b3-4d64-8528-3470e07069bb@arm.com> Date: Mon, 5 Jan 2026 10:36:34 +0000 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 2/3] prandom: Convert prandom_u32_state() to __always_inline Content-Language: en-GB To: "Christophe Leroy (CS GROUP)" , "Jason A. Donenfeld" Cc: Catalin Marinas , Will Deacon , Huacai Chen , Madhavan Srinivasan , Michael Ellerman , Paul Walmsley , Palmer Dabbelt , Albert Ou , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , Kees Cook , "Gustavo A. R. Silva" , Arnd Bergmann , Mark Rutland , Ard Biesheuvel , Jeremy Linton , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, loongarch@lists.linux.dev, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-hardening@vger.kernel.org References: <20260102131156.3265118-1-ryan.roberts@arm.com> <20260102131156.3265118-3-ryan.roberts@arm.com> <719b7b99-3615-46cd-84d9-8b8fc21e3ce9@arm.com> <563a5d0d-c27a-45de-9495-a82403026886@kernel.org> From: Ryan Roberts In-Reply-To: <563a5d0d-c27a-45de-9495-a82403026886@kernel.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260105_023640_331881_8463041D X-CRM114-Status: GOOD ( 27.63 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: 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