linux-kernel - [RFC PATCH] gcc-9: workaround array bounds warning on boot

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Message-ID: <e72c48b3d10540a8b763f5ba862f2b8a@aalto.fi>
Date:   Tue, 6 Aug 2019 18:54:56 +0000
From:   Fihlman Emil <emil.fihlman@...to.fi>
To:     "yauheni.kaliuta@...hat.com" <yauheni.kaliuta@...hat.com>
CC:     "e@...lett.im" <e@...lett.im>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [RFC PATCH] gcc-9: workaround array bounds warning on boot_params
 cleaning

It should also be possibly to simply cast to u64 and then to u8 * unless
the compiler overzealously tracks out of bound accesses even when
6.3.2.3 #5-6 explicitly allows pointer-integer-pointer conversions like
this and removes previous guarantees. Ie.

memset((u8 *)((u64)(&(boot_params->ext_ramdisk_image))), 0, size)

I apologise for not having the in-reply-to header.

Emil Fihlman