linux-kernel - Re: [PATCH] s390/pci: Use the bitmap API to allocate bitmaps

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Date:   Tue, 19 Jul 2022 07:52:55 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Alexander Gordeev <agordeev@...ux.ibm.com>
Cc:     Niklas Schnelle <schnelle@...ux.ibm.com>,
        Gerald Schaefer <gerald.schaefer@...ux.ibm.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        linux-s390@...r.kernel.org
Subject: Re: [PATCH] s390/pci: Use the bitmap API to allocate bitmaps

Le 14/07/2022 à 07:22, Alexander Gordeev a écrit :
> On Sat, Jul 09, 2022 at 06:11:28PM +0200, Christophe JAILLET wrote:
>> I don't know why commit c506fff3d3a8 ("s390/pci: resize iomap") has turned
>> this bitmap from a statically defined bitmap to a runtime-allocated one.
> 
> c506fff3d3a8 commit message:
> 
>      This reduces the size of the iomap from 256K to less than 4K
>      (using the defconfig).
> 

Hi,

IIUC, going from ZPCI_IOMAP_MAX_ENTRIES to ZPCI_IOMAP_ENTRIES reduced 
the size, not going from DECLARE_BITMAP() to kcalloc().

CJ