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From: Mike Rapoport <rppt@linux.ibm.com>
To: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: "Rich Felker" <dalias@libc.org>,
	linux-ia64@vger.kernel.org,
	"Geert Uytterhoeven" <geert+renesas@glider.be>,
	"Fenghua Yu" <fenghua.yu@intel.com>,
	"Benjamin Herrenschmidt" <benh@kernel.crashing.org>,
	linux-mm@kvack.org, "Paul Mackerras" <paulus@samba.org>,
	"Michael Ellerman" <mpe@ellerman.id.au>,
	"Will Deacon" <will@kernel.org>,
	kvmarm@lists.cs.columbia.edu, "Jonas Bonn" <jonas@southpole.se>,
	"Brian Cain" <bcain@codeaurora.org>,
	linux-hexagon@vger.kernel.org, linux-sh@vger.kernel.org,
	"Russell King" <linux@armlinux.org.uk>,
	"Ley Foon Tan" <ley.foon.tan@intel.com>,
	"Catalin Marinas" <catalin.marinas@arm.com>,
	uclinux-h8-devel@lists.sourceforge.jp,
	linux-arch@vger.kernel.org, "Arnd Bergmann" <arnd@arndb.de>,
	"Bartlomiej Zolnierkiewicz" <b.zolnierkie@samsung.com>,
	"Łukasz Stelmach" <l.stelmach@samsung.com>,
	kvm-ppc@vger.kernel.org,
	"Stefan Kristiansson" <stefan.kristiansson@saunalahti.fi>,
	openrisc@lists.librecores.org,
	"Stafford Horne" <shorne@gmail.com>,
	"Guan Xuetao" <gxt@pku.edu.cn>,
	linux-arm-kernel@lists.infradead.org,
	"Christophe Leroy" <christophe.leroy@c-s.fr>,
	"Tony Luck" <tony.luck@intel.com>,
	"Yoshinori Sato" <ysato@users.sourceforge.jp>,
	linux-kernel@vger.kernel.org, "Marc Zyngier" <maz@kernel.org>,
	nios2-dev@lists.rocketboards.org,
	"Andrew Morton" <akpm@linux-foundation.org>,
	linuxppc-dev@lists.ozlabs.org, "Mike Rapoport" <rppt@kernel.org>
Subject: Re: [PATCH v4 02/14] arm: add support for folded p4d page tables
Date: Fri, 8 May 2020 20:42:32 +0300
Message-ID: <20200508174232.GA759899@linux.ibm.com> (raw)
In-Reply-To: <98229ab1-fbf8-0a89-c5d6-270c828799e7@samsung.com>

On Fri, May 08, 2020 at 08:53:27AM +0200, Marek Szyprowski wrote:
> Hi Mike,
> 
> On 07.05.2020 18:11, Mike Rapoport wrote:
> > On Thu, May 07, 2020 at 02:16:56PM +0200, Marek Szyprowski wrote:
> >> On 14.04.2020 17:34, Mike Rapoport wrote:
> >>> From: Mike Rapoport <rppt@linux.ibm.com>
> >>>
> >>> Implement primitives necessary for the 4th level folding, add walks of p4d
> >>> level where appropriate, and remove __ARCH_USE_5LEVEL_HACK.
> >>>
> >>> Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
> >> Today I've noticed that kexec is broken on ARM 32bit. Bisecting between
> >> current linux-next and v5.7-rc1 pointed to this commit. I've tested this
> >> on Odroid XU4 and Raspberry Pi4 boards. Here is the relevant log:
> >>
> >> # kexec --kexec-syscall -l zImage --append "$(cat /proc/cmdline)"
> >> memory_range[0]:0x40000000..0xbe9fffff
> >> memory_range[0]:0x40000000..0xbe9fffff
> >> # kexec -e
> >> kexec_core: Starting new kernel
> >> 8<--- cut here ---
> >> Unable to handle kernel paging request at virtual address c010f1f4
> >> pgd = c6817793
> >> [c010f1f4] *pgd=4000041e(bad)
> >> Internal error: Oops: 80d [#1] PREEMPT ARM
> >> Modules linked in:
> >> CPU: 0 PID: 1329 Comm: kexec Tainted: G        W
> >> 5.7.0-rc3-00127-g6cba81ed0f62 #611
> >> Hardware name: Samsung Exynos (Flattened Device Tree)
> >> PC is at machine_kexec+0x40/0xfc
> > Any chance you have the debug info in this kernel?
> > scripts/faddr2line would come handy here.
> 
> # ./scripts/faddr2line --list vmlinux machine_kexec+0x40
> machine_kexec+0x40/0xf8:
> 
> machine_kexec at arch/arm/kernel/machine_kexec.c:182
>   177            reboot_code_buffer = 
> page_address(image->control_code_page);
>   178
>   179            /* Prepare parameters for reboot_code_buffer*/
>   180            set_kernel_text_rw();
>   181            kexec_start_address = image->start;
>  >182<           kexec_indirection_page = page_list;
>   183            kexec_mach_type = machine_arch_type;
>   184            kexec_boot_atags = image->arch.kernel_r2;
>   185
>   186            /* copy our kernel relocation code to the control code 
> page */
>   187            reboot_entry = fncpy(reboot_code_buffer,

Can you please try the patch below:

diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c
index 963b5284d284..f86b3d17928e 100644
--- a/arch/arm/mm/init.c
+++ b/arch/arm/mm/init.c
@@ -571,7 +571,7 @@ static inline void section_update(unsigned long addr, pmdval_t mask,
 {
 	pmd_t *pmd;
 
-	pmd = pmd_off_k(addr);
+	pmd = pmd_offset(pud_offset(p4d_offset(pgd_offset(mm, addr), addr), addr), addr);
 
 #ifdef CONFIG_ARM_LPAE
 	pmd[0] = __pmd((pmd_val(pmd[0]) & mask) | prot);

>  > ...
> 
> Best regards
> -- 
> Marek Szyprowski, PhD
> Samsung R&D Institute Poland
> 

-- 
Sincerely yours,
Mike.
_______________________________________________
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  reply index

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-14 15:34 [PATCH v4 00/14] mm: remove __ARCH_HAS_5LEVEL_HACK Mike Rapoport
2020-04-14 15:34 ` [PATCH v4 01/14] h8300: remove usage of __ARCH_USE_5LEVEL_HACK Mike Rapoport
2020-04-14 15:34 ` [PATCH v4 02/14] arm: add support for folded p4d page tables Mike Rapoport
     [not found]   ` <CGME20200507121658eucas1p240cf4a3e0fe5c22dda5ec4f72734149f@eucas1p2.samsung.com>
2020-05-07 12:16     ` Marek Szyprowski
2020-05-07 16:11       ` Mike Rapoport
2020-05-08  6:53         ` Marek Szyprowski
2020-05-08 17:42           ` Mike Rapoport [this message]
2020-05-11  6:36             ` Marek Szyprowski
2020-05-11 14:15               ` Mike Rapoport
2020-04-14 15:34 ` [PATCH v4 03/14] arm64: " Mike Rapoport
2020-05-15 18:40   ` Andrew Morton
2020-05-16 17:20     ` Mike Rapoport
2020-04-14 15:34 ` [PATCH v4 04/14] hexagon: remove __ARCH_USE_5LEVEL_HACK Mike Rapoport
2020-04-14 15:34 ` [PATCH v4 05/14] ia64: add support for folded p4d page tables Mike Rapoport
2020-04-14 15:34 ` [PATCH v4 06/14] nios2: " Mike Rapoport
2020-04-14 15:34 ` [PATCH v4 07/14] openrisc: " Mike Rapoport
2020-04-14 15:34 ` [PATCH v4 08/14] powerpc: " Mike Rapoport
2020-06-03 19:05   ` Andrew Morton
2020-06-04  9:50     ` Qian Cai
2020-04-14 15:34 ` [PATCH v4 09/14] sh: fault: Modernize printing of kernel messages Mike Rapoport
2020-04-14 15:34 ` [PATCH v4 10/14] sh: drop __pXd_offset() macros that duplicate pXd_index() ones Mike Rapoport
2020-04-14 15:34 ` [PATCH v4 11/14] sh: add support for folded p4d page tables Mike Rapoport
2020-04-14 15:34 ` [PATCH v4 12/14] unicore32: remove __ARCH_USE_5LEVEL_HACK Mike Rapoport
2020-04-14 15:34 ` [PATCH v4 13/14] asm-generic: remove pgtable-nop4d-hack.h Mike Rapoport
2020-04-14 15:34 ` [PATCH v4 14/14] mm: remove __ARCH_HAS_5LEVEL_HACK and include/asm-generic/5level-fixup.h Mike Rapoport

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