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Arnd Bergmann 287980e49f remove lots of IS_ERR_VALUE abuses 
Most users of IS_ERR_VALUE() in the kernel are wrong, as they
pass an 'int' into a function that takes an 'unsigned long'
argument. This happens to work because the type is sign-extended
on 64-bit architectures before it gets converted into an
unsigned type.

However, anything that passes an 'unsigned short' or 'unsigned int'
argument into IS_ERR_VALUE() is guaranteed to be broken, as are
8-bit integers and types that are wider than 'unsigned long'.

Andrzej Hajda has already fixed a lot of the worst abusers that
were causing actual bugs, but it would be nice to prevent any
users that are not passing 'unsigned long' arguments.

This patch changes all users of IS_ERR_VALUE() that I could find
on 32-bit ARM randconfig builds and x86 allmodconfig. For the
moment, this doesn't change the definition of IS_ERR_VALUE()
because there are probably still architecture specific users
elsewhere.

Almost all the warnings I got are for files that are better off
using 'if (err)' or 'if (err < 0)'.
The only legitimate user I could find that we get a warning for
is the (32-bit only) freescale fman driver, so I did not remove
the IS_ERR_VALUE() there but changed the type to 'unsigned long'.
For 9pfs, I just worked around one user whose calling conventions
are so obscure that I did not dare change the behavior.

I was using this definition for testing:

 #define IS_ERR_VALUE(x) ((unsigned long*)NULL == (typeof (x)*)NULL && \
       unlikely((unsigned long long)(x) >= (unsigned long long)(typeof(x))-MAX_ERRNO))

which ends up making all 16-bit or wider types work correctly with
the most plausible interpretation of what IS_ERR_VALUE() was supposed
to return according to its users, but also causes a compile-time
warning for any users that do not pass an 'unsigned long' argument.

I suggested this approach earlier this year, but back then we ended
up deciding to just fix the users that are obviously broken. After
the initial warning that caused me to get involved in the discussion
(fs/gfs2/dir.c) showed up again in the mainline kernel, Linus
asked me to send the whole thing again.

[ Updated the 9p parts as per Al Viro  - Linus ]

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Andrzej Hajda <a.hajda@samsung.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Link: https://lkml.org/lkml/2016/1/7/363
Link: https://lkml.org/lkml/2016/5/27/486
Acked-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> # For nvmem part
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 		2016-05-27 15:26:11 -07:00
..
Kconfig Merge branch 'for-4.7-dw' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata 2016-05-23 18:19:21 -07:00
Makefile ata: add AMD Seattle platform driver 2016-04-13 15:14:24 -04:00
acard-ahci.c ahci: Store irq number in struct ahci_host_priv 2015-06-03 01:37:49 -04:00
ahci.c AHCI: Remove obsolete Intel Lewisburg SATA RAID device IDs 2016-03-11 12:31:49 -05:00
ahci.h ahci: Cache host controller version 2016-02-19 10:52:46 -05:00
ahci_brcmstb.c drivers: ata: wake port before DMA stop for ALPM 2016-01-25 15:20:44 -05:00
ahci_ceva.c drivers: ata: add support for Ceva sata host controller 2015-06-10 11:15:17 +09:00
ahci_da850.c ata: ahci_platform: fix owner module reference mismatch for scsi host 2015-01-28 18:45:23 -05:00
ahci_imx.c ata: ahci_platform: fix owner module reference mismatch for scsi host 2015-01-28 18:45:23 -05:00
ahci_mvebu.c ata: ahci_mvebu: add support for Armada 3700 variant 2016-02-18 12:41:17 -05:00
ahci_octeon.c libata: support AHCI on OCTEON platform 2016-02-11 10:12:04 -05:00
ahci_platform.c ata: ahci-platform: Add ports-implemented DT bindings. 2016-04-01 10:30:30 -04:00
ahci_qoriq.c ahci: qoriq: Adjust the default register values on ls1021a 2015-12-16 10:24:35 -05:00
ahci_seattle.c ata: add AMD Seattle platform driver 2016-04-13 15:14:24 -04:00
ahci_st.c ata: ahci_st: fixup layering violations / drvdata errors 2015-04-20 13:36:38 -04:00
ahci_sunxi.c ata: ahci_platform: fix owner module reference mismatch for scsi host 2015-01-28 18:45:23 -05:00
ahci_tegra.c ata: ahci_platform: fix owner module reference mismatch for scsi host 2015-01-28 18:45:23 -05:00
ahci_xgene.c ata: ahci_xgene: dereferencing uninitialized pointer in probe 2016-03-11 12:40:34 -05:00
ata_generic.c ata: use CONFIG_PM_SLEEP instead of CONFIG_PM where applicable in host drivers 2014-05-09 22:37:49 -04:00
ata_piix.c ata_piix: Add Device IDs for Intel 9 Series PCH 2014-08-28 08:53:40 -04:00
libahci.c Merge branch 'for-4.6-fixes' into for-4.7 2016-05-13 17:20:48 -04:00
libahci_platform.c ahci: Store irq number in struct ahci_host_priv 2015-06-03 01:37:49 -04:00
libata-acpi.c ACPI and power management updates for 3.15-rc1 2014-04-01 12:48:54 -07:00
libata-core.c Merge branch 'for-4.7-zac' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata 2016-05-23 17:53:39 -07:00
libata-eh.c libata: Implement ZBC OUT translation 2016-05-09 12:36:46 -04:00
libata-pmp.c ata: pmp: add quirk for Marvell 4140 SATA PMP 2015-07-14 17:46:38 -04:00
libata-scsi.c Merge branch 'for-4.7-zac' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata 2016-05-23 17:53:39 -07:00
libata-sff.c libata: fix sff host state machine locking while polling 2016-02-01 11:33:21 -05:00
libata-trace.c libata: NCQ encapsulation for ZAC MANAGEMENT OUT 2016-05-09 12:36:46 -04:00
libata-transport.c libata: add ATA_HORKAGE_NOTRIM 2015-07-15 11:22:35 -04:00
libata-transport.h [libata] Add ATA transport class 2010-10-21 20:21:03 -04:00
libata-zpodd.c libata: zpodd: eliminate odd_can_poweroff 2014-03-14 11:23:47 -04:00
libata.h libata: Implement control mode page to select sense format 2016-04-04 12:07:41 -04:00
pata_acpi.c ata: use CONFIG_PM_SLEEP instead of CONFIG_PM where applicable in host drivers 2014-05-09 22:37:49 -04:00
pata_ali.c ata: use CONFIG_PM_SLEEP instead of CONFIG_PM where applicable in host drivers 2014-05-09 22:37:49 -04:00
pata_amd.c ata: use CONFIG_PM_SLEEP instead of CONFIG_PM where applicable in host drivers 2014-05-09 22:37:49 -04:00
pata_arasan_cf.c Merge branch 'for-4.3' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata 2015-09-02 08:00:54 -07:00
pata_artop.c ata: use CONFIG_PM_SLEEP instead of CONFIG_PM where applicable in host drivers 2014-05-09 22:37:49 -04:00
pata_at32.c ata: drop owner assignment from platform_drivers 2014-10-20 16:20:17 +02:00
pata_at91.c gpio: Include linux/gpio.h instead of asm/gpio.h 2016-02-16 00:20:03 +01:00
pata_atiixp.c ata: use CONFIG_PM_SLEEP instead of CONFIG_PM where applicable in host drivers 2014-05-09 22:37:49 -04:00
pata_atp867x.c ata: remove deprecated use of pci api 2015-04-08 10:55:05 -04:00
pata_bf54x.c gpio: Include linux/gpio.h instead of asm/gpio.h 2016-02-16 00:20:03 +01:00
pata_cmd64x.c ata: use CONFIG_PM_SLEEP instead of CONFIG_PM where applicable in host drivers 2014-05-09 22:37:49 -04:00
pata_cmd640.c ata: use CONFIG_PM_SLEEP instead of CONFIG_PM where applicable in host drivers 2014-05-09 22:37:49 -04:00
pata_cs5520.c ata: remove deprecated use of pci api 2015-04-08 10:55:05 -04:00
pata_cs5530.c ata: Delete unnecessary checks before the function call "pci_dev_put" 2015-02-03 07:04:44 -05:00
pata_cs5535.c ata: use CONFIG_PM_SLEEP instead of CONFIG_PM where applicable in host drivers 2014-05-09 22:37:49 -04:00
pata_cs5536.c ata: use CONFIG_PM_SLEEP instead of CONFIG_PM where applicable in host drivers 2014-05-09 22:37:49 -04:00
pata_cypress.c ata: use CONFIG_PM_SLEEP instead of CONFIG_PM where applicable in host drivers 2014-05-09 22:37:49 -04:00
pata_efar.c ata: use CONFIG_PM_SLEEP instead of CONFIG_PM where applicable in host drivers 2014-05-09 22:37:49 -04:00
pata_ep93xx.c ata: drop owner assignment from platform_drivers 2014-10-20 16:20:17 +02:00
pata_hpt3x2n.c ata: delete non-required instances of include <linux/init.h> 2014-02-13 16:40:56 -05:00
pata_hpt3x3.c ata: remove deprecated use of pci api 2015-04-08 10:55:05 -04:00
pata_hpt37x.c ata: delete non-required instances of include <linux/init.h> 2014-02-13 16:40:56 -05:00
pata_hpt366.c ata: hpt366: convert to use match_string() helper 2016-03-17 15:09:34 -07:00
pata_icside.c scsi: rename SCSI_MAX_{SG, SG_CHAIN}_SEGMENTS 2016-04-15 16:53:14 -04:00
pata_imx.c ata: drop owner assignment from platform_drivers 2014-10-20 16:20:17 +02:00
pata_isapnp.c PNP: ata/pata_isapnp: Use module_pnp_driver to register driver 2015-03-18 22:39:17 +01:00
pata_it821x.c pata_it821x: use "const char *" for string literals 2015-10-15 10:58:53 -04:00
pata_it8213.c ata: use CONFIG_PM_SLEEP instead of CONFIG_PM where applicable in host drivers 2014-05-09 22:37:49 -04:00
pata_ixp4xx_cf.c ata: drop owner assignment from platform_drivers 2014-10-20 16:20:17 +02:00
pata_jmicron.c PCI: Disable async suspend/resume for JMicron multi-function SATA/AHCI 2015-08-24 15:27:11 -05:00
pata_legacy.c pata_legacy: Remove dead code 2014-03-11 08:30:53 -04:00
pata_macio.c PCI: Remove includes of asm/pci-bridge.h 2016-02-05 16:29:28 -06:00
pata_marvell.c ata: use CONFIG_PM_SLEEP instead of CONFIG_PM where applicable in host drivers 2014-05-09 22:37:49 -04:00
pata_mpc52xx.c ata: drop owner assignment from platform_drivers 2014-10-20 16:20:17 +02:00
pata_mpiix.c ata: use CONFIG_PM_SLEEP instead of CONFIG_PM where applicable in host drivers 2014-05-09 22:37:49 -04:00
pata_netcell.c ata: use CONFIG_PM_SLEEP instead of CONFIG_PM where applicable in host drivers 2014-05-09 22:37:49 -04:00
pata_ninja32.c ata: remove deprecated use of pci api 2015-04-08 10:55:05 -04:00
pata_ns87410.c ata: use CONFIG_PM_SLEEP instead of CONFIG_PM where applicable in host drivers 2014-05-09 22:37:49 -04:00
pata_ns87415.c ata: use CONFIG_PM_SLEEP instead of CONFIG_PM where applicable in host drivers 2014-05-09 22:37:49 -04:00
pata_octeon_cf.c pata_octeon_cf: fix broken build 2015-06-08 18:03:04 +09:00
pata_of_platform.c ata: pata_platform: fix owner module reference mismatch for scsi host 2015-01-28 18:45:23 -05:00
pata_oldpiix.c ata: use CONFIG_PM_SLEEP instead of CONFIG_PM where applicable in host drivers 2014-05-09 22:37:49 -04:00
pata_opti.c ata: use CONFIG_PM_SLEEP instead of CONFIG_PM where applicable in host drivers 2014-05-09 22:37:49 -04:00
pata_optidma.c ata: use CONFIG_PM_SLEEP instead of CONFIG_PM where applicable in host drivers 2014-05-09 22:37:49 -04:00
pata_palmld.c ata: drop owner assignment from platform_drivers 2014-10-20 16:20:17 +02:00
pata_pcmcia.c ata: delete non-required instances of include <linux/init.h> 2014-02-13 16:40:56 -05:00
pata_pdc202xx_old.c ata: use CONFIG_PM_SLEEP instead of CONFIG_PM where applicable in host drivers 2014-05-09 22:37:49 -04:00
pata_pdc2027x.c ata: remove deprecated use of pci api 2015-04-08 10:55:05 -04:00
pata_piccolo.c ata: use CONFIG_PM_SLEEP instead of CONFIG_PM where applicable in host drivers 2014-05-09 22:37:49 -04:00
pata_platform.c ata: pata_platform: fix owner module reference mismatch for scsi host 2015-01-28 18:45:23 -05:00
pata_pxa.c ata: pata_pxa: dmaengine conversion 2015-09-10 17:02:04 -04:00
pata_radisys.c ata: use CONFIG_PM_SLEEP instead of CONFIG_PM where applicable in host drivers 2014-05-09 22:37:49 -04:00
pata_rb532_cf.c pata-rb532-cf: get rid of the irq_to_gpio() call 2016-02-18 11:26:27 -05:00
pata_rdc.c ata: use CONFIG_PM_SLEEP instead of CONFIG_PM where applicable in host drivers 2014-05-09 22:37:49 -04:00
pata_rz1000.c ata: use CONFIG_PM_SLEEP instead of CONFIG_PM where applicable in host drivers 2014-05-09 22:37:49 -04:00
pata_samsung_cf.c libata: samsung_cf: fix handling platform_get_irq result 2015-09-25 11:50:15 -04:00
pata_sc1200.c ata: use CONFIG_PM_SLEEP instead of CONFIG_PM where applicable in host drivers 2014-05-09 22:37:49 -04:00
pata_sch.c ata: use CONFIG_PM_SLEEP instead of CONFIG_PM where applicable in host drivers 2014-05-09 22:37:49 -04:00
pata_serverworks.c pata_serverworks: disable 64-KB DMA transfers on Broadcom OSB4 IDE Controller 2014-10-07 17:10:14 -04:00
pata_sil680.c ata: remove deprecated use of pci api 2015-04-08 10:55:05 -04:00
pata_sis.c ata: use CONFIG_PM_SLEEP instead of CONFIG_PM where applicable in host drivers 2014-05-09 22:37:49 -04:00
pata_sl82c105.c ata: use CONFIG_PM_SLEEP instead of CONFIG_PM where applicable in host drivers 2014-05-09 22:37:49 -04:00
pata_triflex.c ata: use CONFIG_PM_SLEEP instead of CONFIG_PM where applicable in host drivers 2014-05-09 22:37:49 -04:00
pata_via.c ata: use CONFIG_PM_SLEEP instead of CONFIG_PM where applicable in host drivers 2014-05-09 22:37:49 -04:00
pdc_adma.c ata: remove deprecated use of pci api 2015-04-08 10:55:05 -04:00
sata_dwc_460ex.c ata: sata_dwc_460ex: make debug messages neat 2016-05-12 10:54:12 -04:00
sata_fsl.c ata/sata_fsl.c: add ATA_FLAG_NO_LOG_PAGE to blacklist the controller for log page reads 2015-12-07 10:25:57 -05:00
sata_highbank.c remove lots of IS_ERR_VALUE abuses 2016-05-27 15:26:11 -07:00
sata_inic162x.c ata: remove deprecated use of pci api 2015-04-08 10:55:05 -04:00
sata_mv.c ata: remove deprecated use of pci api 2015-04-08 10:55:05 -04:00
sata_nv.c ata:sata_nv - Change 1 to true for bool type variable. 2015-05-25 20:06:55 -04:00
sata_promise.c ata: remove deprecated use of pci api 2015-04-08 10:55:05 -04:00
sata_promise.h libata annotations and fixes 2008-01-23 05:24:15 -05:00
sata_qstor.c ata: remove deprecated use of pci api 2015-04-08 10:55:05 -04:00
sata_rcar.c ata: sata_rcar: Remove obsolete platform_device_id entries 2015-11-24 09:54:36 -05:00
sata_sil.c sata_sil: disable trim 2015-11-30 10:02:49 -05:00
sata_sil24.c ata: remove deprecated use of pci api 2015-04-08 10:55:05 -04:00
sata_sis.c ata: use CONFIG_PM_SLEEP instead of CONFIG_PM where applicable in host drivers 2014-05-09 22:37:49 -04:00
sata_svw.c powerpc updates for 4.1 2015-04-16 13:53:32 -05:00
sata_sx4.c sata_sx4: correctly handling failed allocation 2015-12-31 21:33:42 -05:00
sata_uli.c ata: delete non-required instances of include <linux/init.h> 2014-02-13 16:40:56 -05:00
sata_via.c sata_via: Implement hotplug for VT6421 2016-02-25 13:22:16 -05:00
sata_vsc.c ata: remove deprecated use of pci api 2015-04-08 10:55:05 -04:00
sis.h libata: PATA-mode fixes for sis_sata 2007-07-02 10:17:42 -04:00