linux-kernel - Re: patch suggestion: Kconfig symbols

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Message-ID: <e77e2329bdafdbea538be0d7edb8a9d7d3e45990.camel@perches.com>
Date:   Wed, 28 Jul 2021 08:37:26 -0700
From:   Joe Perches <joe@...ches.com>
To:     Randy Dunlap <rdunlap@...radead.org>,
        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 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.

$ 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