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Rozycki" Cc: Thomas Bogendoerfer , ambrosehua@gmail.com, Bibo Mao , Andrew Morton , linux-mips@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, Jiaxun Yang , Paul Burton , Li Xuefeng , Yang Tiezhu , Gao Juxin , Fuxin Zhang , Huacai Chen Subject: Re: [PATCH] MIPS: clean up CONFIG_MIPS_PGD_C0_CONTEXT handling Message-ID: <20210304010623.4tyzpzgllsdy3ssg@ambrosehua-HP-xw6600-Workstation> References: <20210227061944.266415-1-huangpei@loongson.cn> <20210227061944.266415-2-huangpei@loongson.cn> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: NeoMutt/20171215 X-CM-TRANSID:AQAAf9Ax6dWPMkBg7hMUAA--.6296S2 X-Coremail-Antispam: 1UD129KBjvJXoW7ZFyxXrWUXFW8ZryxCr1xXwb_yoW8ur1xpa 95t3WkGr4jvryjgrZIvFZ8Xr4Fqw4qk3s0vFnFqF9xtFWjgFyrGFs7Gr1S9rn8AFs2ya17 WryYgFy5uF1Iyw7anT9S1TB71UUUUUUqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUvC14x267AKxVW8JVW5JwAFc2x0x2IEx4CE42xK8VAvwI8IcIk0 rVWrJVCq3wAFIxvE14AKwVWUJVWUGwA2ocxC64kIII0Yj41l84x0c7CEw4AK67xGY2AK02 1l84ACjcxK6xIIjxv20xvE14v26r4j6ryUM28EF7xvwVC0I7IYx2IY6xkF7I0E14v26r4j 6F4UM28EF7xvwVC2z280aVAFwI0_Gr1j6F4UJwA2z4x0Y4vEx4A2jsIEc7CjxVAFwI0_Gr 1j6F4UJwAS0I0E0xvYzxvE52x082IY62kv0487Mc02F40EFcxC0VAKzVAqx4xG6I80ewAv 7VC0I7IYx2IY67AKxVWUJVWUGwAv7VC2z280aVAFwI0_Jr0_Gr1lOx8S6xCaFVCjc4AY6r 1j6r4UM4x0Y48IcVAKI48JM4x0x7Aq67IIx4CEVc8vx2IErcIFxwACI402YVCY1x02628v n2kIc2xKxwCY02Avz4vE14v_KwCF04k20xvY0x0EwIxGrwCFx2IqxVCFs4IE7xkEbVWUJV W8JwC20s026c02F40E14v26r1j6r18MI8I3I0E7480Y4vE14v26r106r1rMI8E67AF67kF 1VAFwI0_Jw0_GFylIxkGc2Ij64vIr41lIxAIcVC0I7IYx2IY67AKxVWUJVWUCwCI42IY6x IIjxv20xvEc7CjxVAFwI0_Gr0_Cr1lIxAIcVCF04k26cxKx2IYs7xG6rW3Jr0E3s1lIxAI cVC2z280aVAFwI0_Jr0_Gr1lIxAIcVC2z280aVCY1x0267AKxVW8JVW8JrUvcSsGvfC2Kf nxnUUI43ZEXa7VUbLiSPUUUUU== X-CM-SenderInfo: xkxd0whshlqz5rrqw2lrqou0/ X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 040E0132 X-Stat-Signature: dpx1by5jtswqe63i3k4f5xsewx6z91je Received-SPF: none (loongson.cn>: No applicable sender policy available) receiver=imf20; identity=mailfrom; envelope-from=""; helo=loongson.cn; client-ip=114.242.206.163 X-HE-DKIM-Result: none/none X-HE-Tag: 1614819994-240311 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000345, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Hi, On Mon, Mar 01, 2021 at 12:00:28AM +0100, Maciej W. Rozycki wrote: > On Sat, 27 Feb 2021, Huang Pei wrote: > > > index 2000bb2b0220..517509ad8596 100644 > > --- a/arch/mips/Kconfig > > +++ b/arch/mips/Kconfig > > @@ -2142,6 +2142,7 @@ config CPU_SUPPORTS_HUGEPAGES > > depends on !(32BIT && (ARCH_PHYS_ADDR_T_64BIT || EVA)) > > config MIPS_PGD_C0_CONTEXT > > bool > > + depends on 64BIT > > default y if 64BIT && (CPU_MIPSR2 || CPU_MIPSR6) && !CPU_XLP > > I guess you want: > > default y if (CPU_MIPSR2 || CPU_MIPSR6) && !CPU_XLP > > at the same time too. Otherwise you have cruft left behind. > Yes, it is much better > > diff --git a/arch/mips/mm/tlbex.c b/arch/mips/mm/tlbex.c > > index a7521b8f7658..5bb9724578f7 100644 > > --- a/arch/mips/mm/tlbex.c > > +++ b/arch/mips/mm/tlbex.c > > @@ -1106,6 +1106,7 @@ struct mips_huge_tlb_info { > > bool need_reload_pte; > > }; > > > > +#ifdef CONFIG_64BIT > > static struct mips_huge_tlb_info > > build_fast_tlb_refill_handler (u32 **p, struct uasm_label **l, > > struct uasm_reloc **r, unsigned int tmp, > > Does it actually build without a warning for !CONFIG_64BIT given the > reference below? No, my bad, my first reaction when seeing "IS_ENABLED(CONFIG_64BIT)" is "#ifdef CONFIG_64BIT" > > > @@ -1164,8 +1165,8 @@ build_fast_tlb_refill_handler (u32 **p, struct uasm_label **l, > > > > if (pgd_reg == -1) { > > vmalloc_branch_delay_filled = 1; > > - /* 1 0 1 0 1 << 6 xkphys cached */ > > - uasm_i_ori(p, ptr, ptr, 0x540); > > + /* insert bit[63:59] of CAC_BASE into bit[11:6] of ptr */ > > + uasm_i_ori(p, ptr, ptr, (CAC_BASE >> 53)); > > Instead I'd paper the issue over by casting the constant to `s64'. > > Or better yet fixed it properly by defining CAC_BASE, etc. as `unsigned > long long' long rather than `unsigned long' to stop all this nonsense > (e.g. PHYS_TO_XKPHYS already casts the result to `s64'). Thomas, WDYT? Sorry, I do not get it , on MIPS32, how can CAC_BASE be unsigned long long ? If this did not work, how about one step back, just explicit comment wihtout "(CAC_BASE << 53)" ? > > Maciej