linux-kernel - Re: patch suggestion: Kconfig symbols

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Date:   Wed, 28 Jul 2021 12:41:33 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Joe Perches <joe@...ches.com>,
        linux-kernel-mentees@...ts.linuxfoundation.org
Cc:     LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors <kernel-janitors@...r.kernel.org>
Subject: Re: patch suggestion: Kconfig symbols

On 7/28/21 8:37 AM, Joe Perches wrote:
> On Mon, 2021-07-26 at 17:21 -0700, Randy Dunlap wrote:
>> Running scripts/checkkconfigsymbols.py reports several hundred (maybe thousand)
>> Kconfig symbols that are used questionably. Lots of these are false positives
>> but lots of the remainder could use some cleaning up.
> []
>> False positive example:
>>
>> XCHOFFLD_MEM
>> Referencing files: drivers/scsi/qla2xxx/qla_mbx.c
>> Similar symbols: OF_PMEM, CXL_MEM, CXL_PMEM
>>
>> The Referencing source file does this:
>> #define CONFIG_XCHOFFLD_MEM	0x3
>>
>> which is legitimate, so no change is needed.
> 
> Legitimate is perhaps dubious.
> 
> It might be better if Kconfig has exclusive use of CONFIG_<foo> naming so
> renaming all the other existing CONFIG_<foo> defines might be appropriate.

I would prefer that as well -- maybe 15 years ago.
But I think it's too invasive to make that change now.

> 
> $ git grep -P '^\s*#\s*define\s+CONFIG_[A-Z]+\b'
> arch/alpha/kernel/smc37c93x.c:#define CONFIG_CONTROL            0x02
> arch/sh/drivers/pci/ops-sh4.c:#define CONFIG_CMD(bus, devfn, where) \
> arch/sh/include/asm/smc37c93x.h:#define CONFIG_PORT             0x3f0
> arch/sh/include/asm/smc37c93x.h:#define CONFIG_ENTER            0x55
> arch/sh/include/asm/smc37c93x.h:#define CONFIG_EXIT             0xaa
> arch/sparc/kernel/pcic.c:#define CONFIG_CMD(bus, device_fn, where) (0x80000000 | (((unsigned int)bus) << 16) | (((unsigned int)device_fn) << 8) | (where & ~3))
> arch/um/drivers/mconsole_kern.h:#define CONFIG_CHUNK(str, size, current, chunk, end) \
> drivers/atm/he.h:#define CONFIG_RSRA            0x00000
> drivers/atm/he.h:#define CONFIG_RCMLBM          0x08000
> drivers/atm/he.h:#define CONFIG_RCMABR          0x0d800
> drivers/atm/he.h:#define CONFIG_RSRB            0x0e000
> drivers/atm/he.h:#define CONFIG_TSRA            0x00000
> drivers/atm/he.h:#define CONFIG_TSRB            0x08000
> drivers/atm/he.h:#define CONFIG_TSRC            0x0c000
> drivers/atm/he.h:#define CONFIG_TSRD            0x0e000
> drivers/atm/he.h:#define CONFIG_TMABR           0x0f000
> drivers/atm/he.h:#define CONFIG_TPDBA           0x10000
> drivers/comedi/drivers/ni_at_a2150.c:#define CONFIG_REG         0x0
> drivers/crypto/atmel-i2c.h:#define CONFIG_ZONE                  0
> drivers/dma/idxd/perfmon.h:#define CONFIG_RESET         0x0000000000000001
> drivers/gpu/drm/amd/amdgpu/sid.h:#define        CONFIG_MEMSIZE                                  0x150A
> drivers/gpu/drm/amd/amdgpu/sid.h:#define CONFIG_CNTL    0x1509
> drivers/gpu/drm/radeon/cikd.h:#define   CONFIG_MEMSIZE                                  0x5428
> drivers/gpu/drm/radeon/evergreend.h:#define     CONFIG_MEMSIZE                                  0x5428
> drivers/gpu/drm/radeon/nid.h:#define    CONFIG_MEMSIZE                                  0x5428
> drivers/gpu/drm/radeon/r600d.h:#define  CONFIG_MEMSIZE                                  0x5428
> drivers/gpu/drm/radeon/r600d.h:#define CONFIG_CNTL                                      0x5424
> drivers/gpu/drm/radeon/rv515d.h:#define CONFIG_MEMSIZE                  0x00F8
> drivers/gpu/drm/radeon/rv770d.h:#define CONFIG_MEMSIZE                                  0x5428
> drivers/gpu/drm/radeon/sid.h:#define    CONFIG_MEMSIZE                                  0x5428
> drivers/macintosh/therm_adt746x.c:#define CONFIG_REG   0x40
> drivers/memory/ti-aemif.c:#define CONFIG_MASK   (TA(TA_MAX) | \
> drivers/mtd/spi-nor/controllers/aspeed-smc.c:#define CONFIG_REG                 0x0
> drivers/net/ethernet/smsc/smc91x.h:#define CONFIG_REG(lp)       SMC_REG(lp, 0x0000,     1)
> drivers/net/ethernet/smsc/smc91x.h:#define CONFIG_GPCNTRL       0x0400  // Inverse value drives pin nCNTRL
> drivers/net/ethernet/smsc/smc91x.h:#define CONFIG_DEFAULT       (CONFIG_EPH_POWER_EN)
> drivers/pcmcia/cs_internal.h:#define CONFIG_LOCKED              0x01
> drivers/pinctrl/mvebu/pinctrl-dove.c:#define CONFIG_PMU BIT(4)
> drivers/staging/vt6655/device_cfg.h:#define CONFIG_PATH            "/etc/vntconfiguration.dat"
> drivers/staging/vt6656/device.h:#define CONFIG_PATH                     "/etc/vntconfiguration.dat"
> drivers/thermal/qcom/tsens-8960.c:#define CONFIG_ADDR           0x3640
> drivers/thermal/qcom/tsens-8960.c:#define CONFIG_MASK           0xf
> drivers/usb/host/xhci.h:#define CONFIG_CIE              (1 << 9)
> drivers/video/fbdev/geode/display_gx1.h:#define CONFIG_GCR  0xb8
> tools/power/x86/intel-speed-select/isst.h:#define CONFIG_TDP                            0x7f
> tools/power/x86/intel-speed-select/isst.h:#define CONFIG_CLOS                           0xd0
> tools/testing/selftests/powerpc/copyloops/asm/ppc_asm.h:#define CONFIG_ALTIVEC
> tools/testing/selftests/powerpc/stringloops/asm/ppc_asm.h:#define CONFIG_ALTIVEC
> tools/testing/selftests/rcutorture/formal/srcu-cbmc/src/config.h:#define CONFIG_SMP
> tools/virtio/linux/kernel.h:#define CONFIG_SMP
> 
> 


-- 
~Randy