linux-kernel - Re: [PATCH 19/21] treewide: add checks for the return value of memblock

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Message-ID: <20190117070602.GA31839@guoren-Inspiron-7460>
Date:   Thu, 17 Jan 2019 15:06:03 +0800
From:   Guo Ren <guoren@...nel.org>
To:     Mike Rapoport <rppt@...ux.ibm.com>
Cc:     linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Christoph Hellwig <hch@....de>,
        "David S. Miller" <davem@...emloft.net>,
        Dennis Zhou <dennis@...nel.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Greentime Hu <green.hu@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Guan Xuetao <gxt@....edu.cn>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Mark Salter <msalter@...hat.com>,
        Matt Turner <mattst88@...il.com>,
        Max Filippov <jcmvbkbc@...il.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Michal Simek <monstr@...str.eu>,
        Paul Burton <paul.burton@...s.com>,
        Petr Mladek <pmladek@...e.com>, Rich Felker <dalias@...c.org>,
        Richard Weinberger <richard@....at>,
        Rob Herring <robh+dt@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        Stafford Horne <shorne@...il.com>,
        Tony Luck <tony.luck@...el.com>,
        Vineet Gupta <vgupta@...opsys.com>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        devicetree@...r.kernel.org, kasan-dev@...glegroups.com,
        linux-alpha@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-c6x-dev@...ux-c6x.org, linux-ia64@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-m68k@...ts.linux-m68k.org,
        linux-mips@...r.kernel.org, linux-s390@...r.kernel.org,
        linux-sh@...r.kernel.org, linux-snps-arc@...ts.infradead.org,
        linux-um@...ts.infradead.org, linux-usb@...r.kernel.org,
        linux-xtensa@...ux-xtensa.org, linuxppc-dev@...ts.ozlabs.org,
        openrisc@...ts.librecores.org, sparclinux@...r.kernel.org,
        uclinux-h8-devel@...ts.sourceforge.jp, x86@...nel.org,
        xen-devel@...ts.xenproject.org
Subject: Re: [PATCH 19/21] treewide: add checks for the return value of
 memblock_alloc*()

On Wed, Jan 16, 2019 at 03:44:19PM +0200, Mike Rapoport wrote:
>  arch/csky/mm/highmem.c                    |  5 +++++
...
> diff --git a/arch/csky/mm/highmem.c b/arch/csky/mm/highmem.c
> index 53b1bfa..3317b774 100644
> --- a/arch/csky/mm/highmem.c
> +++ b/arch/csky/mm/highmem.c
> @@ -141,6 +141,11 @@ static void __init fixrange_init(unsigned long start, unsigned long end,
>  			for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) {
>  				if (pmd_none(*pmd)) {
>  					pte = (pte_t *) memblock_alloc_low(PAGE_SIZE, PAGE_SIZE);
> +					if (!pte)
> +						panic("%s: Failed to allocate %lu bytes align=%lx\n",
> +						      __func__, PAGE_SIZE,
> +						      PAGE_SIZE);
> +
>  					set_pmd(pmd, __pmd(__pa(pte)));
>  					BUG_ON(pte != pte_offset_kernel(pmd, 0));
>  				}

Looks good for me and panic is ok.

Reviewed-by: Guo Ren <ren_guo@...ky.com>