From patchwork Thu May 19 15:59:17 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jisheng Zhang X-Patchwork-Id: 12855752 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 D952CC433EF for ; Thu, 19 May 2022 16:08:14 +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:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=dl3OBT9T/avG9GthYZc5rzmbdYhLGkfG+soWfoddNh4=; b=22+sb/ZjAGJDfl UYIgz3HXH4HQ6IyzY5rrUcWh4Rf7EvXQS4GydyesGuM8a2JJNXRpbg8kJ6U1C8eFmGyGcNzMmwP+P ke85fC6zkpWHGxFjJv9buLGe1vWknFcczPmf500LvzH+M8YiA5bUeb1P7ll2E95xzoJTJyYvq0EyG MjGy3FovWN9jnQ48LJM6k5VcXReBsVhP2RYNkqTGkppk6hYyuvlD77nESM3cAosyEE2j+Hsf9ik/M voO8dmUpEyU7SXNhCFuFzmHEABD21CgiFa2fzxvReHFsIuN19bM3kyDvFWKpTPRztF2wvHp0vmFBk t98jU1tMzOHjaYUSBwDA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nrih4-008IsG-Ri; Thu, 19 May 2022 16:08:06 +0000 Received: from dfw.source.kernel.org ([2604:1380:4641:c500::1]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1nrih2-008Iqx-H0 for linux-riscv@lists.infradead.org; Thu, 19 May 2022 16:08:05 +0000 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id BB7F961BDC; Thu, 19 May 2022 16:08:03 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id D17CFC34113; Thu, 19 May 2022 16:07:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1652976483; bh=9UIogW/hGkD7UNMXBrouLXfFfzy7yMoOEYum4Eptm84=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=YonGe4NX2xCRT2Lj+eZF+8nXu3b0omXDd5Rk4kWFcd370QtqBpQEul36v+XG/OJJY 0hWhBZQ582oYmBZVLEYHvQJq/xe5QKPGQdxgRh32qFU2nYeAWkXkMNgQnF2fFxZbU3 ArQPkMe0LIeRkOm4/l2ejfKI2ZX+hp7kvbgBYI50TKtf5gy0Ufld0+mLzdV1s5xbjU OYXMoEcqQkS71MbeI8ziiAiLDD10ZDxvRodBOJAOeAvSfy6z+v2jJ8EZE0n0scSmJP nNbhmZEVQyAOch3t6VrUAsD1IOlsgcrQZ8ijWOg/mcseqSCee/0ChquCWWLRvYA5YI Wq1PwJr/6wDyw== From: Jisheng Zhang To: Paul Walmsley , Palmer Dabbelt , Albert Ou , Andrey Ryabinin , Alexander Potapenko , Andrey Konovalov , Dmitry Vyukov , Vincenzo Frascino , Alexandre Ghiti , Anup Patel , Atish Patra Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com Subject: [PATCH v3 1/2] riscv: move sbi_init() earlier before jump_label_init() Date: Thu, 19 May 2022 23:59:17 +0800 Message-Id: <20220519155918.3882-2-jszhang@kernel.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220519155918.3882-1-jszhang@kernel.org> References: <20220519155918.3882-1-jszhang@kernel.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220519_090804_679278_C9A4586F X-CRM114-Status: GOOD ( 13.48 ) 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: , Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org We call jump_label_init() in setup_arch() is to use static key mechanism earlier, but riscv jump label relies on the sbi functions, If we enable static key before sbi_init(), the code path looks like: static_branch_enable() .. arch_jump_label_transform() patch_text_nosync() flush_icache_range() flush_icache_all() sbi_remote_fence_i() for CONFIG_RISCV_SBI case __sbi_rfence() Since sbi isn't initialized, so NULL deference! Here is a typical panic log: [ 0.000000] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000 [ 0.000000] Oops [#1] [ 0.000000] Modules linked in: [ 0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 5.18.0-rc7+ #79 [ 0.000000] Hardware name: riscv-virtio,qemu (DT) [ 0.000000] epc : 0x0 [ 0.000000] ra : sbi_remote_fence_i+0x1e/0x26 [ 0.000000] epc : 0000000000000000 ra : ffffffff80005826 sp : ffffffff80c03d50 [ 0.000000] gp : ffffffff80ca6178 tp : ffffffff80c0ad80 t0 : 6200000000000000 [ 0.000000] t1 : 0000000000000000 t2 : 62203a6b746e6972 s0 : ffffffff80c03d60 [ 0.000000] s1 : ffffffff80001af6 a0 : 0000000000000000 a1 : 0000000000000000 [ 0.000000] a2 : 0000000000000000 a3 : 0000000000000000 a4 : 0000000000000000 [ 0.000000] a5 : 0000000000000000 a6 : 0000000000000000 a7 : 0000000000080200 [ 0.000000] s2 : ffffffff808b3e48 s3 : ffffffff808bf698 s4 : ffffffff80cb2818 [ 0.000000] s5 : 0000000000000001 s6 : ffffffff80c9c345 s7 : ffffffff80895aa0 [ 0.000000] s8 : 0000000000000001 s9 : 000000000000007f s10: 0000000000000000 [ 0.000000] s11: 0000000000000000 t3 : ffffffff80824d08 t4 : 0000000000000022 [ 0.000000] t5 : 000000000000003d t6 : 0000000000000000 [ 0.000000] status: 0000000000000100 badaddr: 0000000000000000 cause: 000000000000000c [ 0.000000] ---[ end trace 0000000000000000 ]--- [ 0.000000] Kernel panic - not syncing: Attempted to kill the idle task! [ 0.000000] ---[ end Kernel panic - not syncing: Attempted to kill the idle task! ]--- Fix this issue by moving sbi_init() earlier before jump_label_init() Signed-off-by: Jisheng Zhang --- arch/riscv/kernel/setup.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/riscv/kernel/setup.c b/arch/riscv/kernel/setup.c index 834eb652a7b9..d150cedeb7e0 100644 --- a/arch/riscv/kernel/setup.c +++ b/arch/riscv/kernel/setup.c @@ -268,6 +268,7 @@ void __init setup_arch(char **cmdline_p) *cmdline_p = boot_command_line; early_ioremap_setup(); + sbi_init(); jump_label_init(); parse_early_param(); @@ -284,7 +285,6 @@ void __init setup_arch(char **cmdline_p) misc_mem_init(); init_resources(); - sbi_init(); #ifdef CONFIG_KASAN kasan_init();