From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <1342079353.30654.18.camel@shinybook.infradead.org> Subject: Re: [PATCH 1/2] mtd: fix wrong usage of ioremap_nocache() in uclinux.c map driver From: David Woodhouse To: Greg Ungerer Date: Thu, 12 Jul 2012 08:49:13 +0100 In-Reply-To: <4FFA7576.7050204@snapgear.com> References: <1336632929-26100-1-git-send-email-gerg@snapgear.com> <1341590150.26921.16.camel@shinybook.infradead.org> <4FFA7576.7050204@snapgear.com> Content-Type: multipart/signed; micalg="sha1"; protocol="application/x-pkcs7-signature"; boundary="=-NnKQQfLDN/G/BzExZUm2" Mime-Version: 1.0 Cc: linux-mtd@lists.infradead.org, uclinux-dev@uclinux.org List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , --=-NnKQQfLDN/G/BzExZUm2 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2012-07-09 at 16:08 +1000, Greg Ungerer wrote: >=20 > The only VM based arch this driver can be configured for currently > is m68k (actually it is even more specific, only CONFIG_COLDFIRE). > And that doesn't support HIGHMEM. OK, can we at least have a comment to that effect in the code, alongside that phys_to_virt() call so that nobody is tempted to copy it into new code? And preferably also an '#ifdef CONFIG_HIGHMEM / #error' in the code or a (redundant) !HIGHMEM dependency in Kconfig just to make sure, in case it's ever enabled on other architectures or in case HIGHMEM ever comes to m68k. =20 > Can the kernels data region (and the area immediately after it) be in > high memory?=20 No, that'll be in the directly mapped region. --=20 dwmw2 --=-NnKQQfLDN/G/BzExZUm2 Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIUbjCCBjQw ggQcoAMCAQICAR4wDQYJKoZIhvcNAQEFBQAwfTELMAkGA1UEBhMCSUwxFjAUBgNVBAoTDVN0YXJ0 Q29tIEx0ZC4xKzApBgNVBAsTIlNlY3VyZSBEaWdpdGFsIENlcnRpZmljYXRlIFNpZ25pbmcxKTAn BgNVBAMTIFN0YXJ0Q29tIENlcnRpZmljYXRpb24gQXV0aG9yaXR5MB4XDTA3MTAyNDIxMDE1NVoX DTE3MTAyNDIxMDE1NVowgYwxCzAJBgNVBAYTAklMMRYwFAYDVQQKEw1TdGFydENvbSBMdGQuMSsw 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