netdev - Re: [PATCH 2/4] lpfc: reduce stack size with CONFIG_GCC_PLUGIN_STRUCTLEAK

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Message-ID: <yq1y3146pvc.fsf@oracle.com>
Date:   Thu, 11 Jul 2019 20:47:03 -0400
From:   "Martin K. Petersen" <martin.petersen@...cle.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Kees Cook <keescook@...omium.org>,
        James Smart <james.smart@...adcom.com>,
        Dick Kennedy <dick.kennedy@...adcom.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Larry Finger <Larry.Finger@...inger.net>,
        Florian Schilhabel <florian.c.schilhabel@...glemail.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "David S . Miller" <davem@...emloft.net>,
        Wensong Zhang <wensong@...ux-vs.org>,
        Simon Horman <horms@...ge.net.au>,
        Julian Anastasov <ja@....bg>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        James Morris <jmorris@...ei.org>, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org, devel@...verdev.osuosl.org,
        netdev@...r.kernel.org, lvs-devel@...r.kernel.org,
        netfilter-devel@...r.kernel.org, coreteam@...filter.org,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Hannes Reinecke <hare@...e.com>, Willy Tarreau <w@....eu>,
        Silvio Cesare <silvio.cesare@...il.com>
Subject: Re: [PATCH 2/4] lpfc: reduce stack size with CONFIG_GCC_PLUGIN_STRUCTLEAK_VERBOSE


Arnd,

> The lpfc_debug_dump_all_queues() function repeatedly calls into
> lpfc_debug_dump_qe(), which has a temporary 128 byte buffer.  This was
> fine before the introduction of CONFIG_GCC_PLUGIN_STRUCTLEAK_VERBOSE
> because each instance could occupy the same stack slot. However, now
> they each get their own copy, which leads to a huge increase in stack
> usage as seen from the compiler warning:

Applied to 5.3/scsi-fixes. Thank you!

-- 
Martin K. Petersen	Oracle Linux Engineering