Re: [PATCH 4/4] MIPS: mm: Clean up setup of protection map

[Guenter Roeck <linux@roeck-us.net>]

On Fri, Nov 13, 2020 at 12:09:52PM +0100, Thomas Bogendoerfer wrote:
> Protection map difference between RIXI and non RIXI cpus is _PAGE_NO_EXEC
> and _PAGE_NO_READ usage. Both already take care of cpu_has_rixi while
> setting up the page bits. So we just need one setup of protection map
> and can drop the now unused (and broken for RIXI) PAGE_* defines.
> 
> Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
> ---

This patch results in:

drivers/video/fbdev/udlfb.c: In function 'dlfb_ops_mmap':
drivers/video/fbdev/udlfb.c:343:52: error: 'PAGE_SHARED' undeclared (first use in this function)
  343 |   if (remap_pfn_range(vma, start, page, PAGE_SIZE, PAGE_SHARED))
      |                                                    ^~~~~~~~~~~

when building mips:allmodconfig.

Guenter

---
bisect log:

# bad: [3cc2bd440f2171f093b3a8480a4b54d8c270ed38] Add linux-next specific files for 20201211
# good: [0477e92881850d44910a7e94fc2c46f96faa131f] Linux 5.10-rc7
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git bisect bad 0a701401d4e29d9e73f0f3cc02179fc6c9191646
# bad: [196d9132cc82feb410b6386491de9ac5661b0b76] Merge remote-tracking branch 'printk/for-next'
git bisect bad 196d9132cc82feb410b6386491de9ac5661b0b76
# good: [5bc192c72197553fe3b934830482caf931347c9c] Merge remote-tracking branch 'arm-soc/for-next'
git bisect good 5bc192c72197553fe3b934830482caf931347c9c
# bad: [24aa026d842ebfa5ff9cefe92bb3d6cc6a558206] Merge remote-tracking branch 'risc-v/for-next'
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# good: [44e8eb23644eaf38dbfaf4a68d08b13c190f58c2] Merge remote-tracking branch 'm68knommu/for-next'
git bisect good 44e8eb23644eaf38dbfaf4a68d08b13c190f58c2
# good: [ff57698a9610fcf7d9c4469bf68c881eff22e2f8] powerpc: Fix update form addressing in inline assembly
git bisect good ff57698a9610fcf7d9c4469bf68c881eff22e2f8
# bad: [a7ab7f9e2de7e39cafa041fcba425935b2c188bf] Merge remote-tracking branch 'parisc-hd/for-next'
git bisect bad a7ab7f9e2de7e39cafa041fcba425935b2c188bf
# good: [724d554a117a0552c2c982f0b5cd1d685274d678] MIPS: vdso: Use vma page protection for remapping
git bisect good 724d554a117a0552c2c982f0b5cd1d685274d678
# bad: [27f45b5690f7cfe916c83aaa7263ac3da7e251ee] Merge remote-tracking branch 'mips/mips-next'
git bisect bad 27f45b5690f7cfe916c83aaa7263ac3da7e251ee
# bad: [79109a515ac3f1009632f4a4c81597e9438a2d65] MIPS: configs: drop unused BACKLIGHT_GENERIC option
git bisect bad 79109a515ac3f1009632f4a4c81597e9438a2d65
# bad: [74a2810b7c1fcd60c87a8c47f95660628e00e97c] MIPS: KASLR: Correct valid bits in apply_r_mips_26_rel()
git bisect bad 74a2810b7c1fcd60c87a8c47f95660628e00e97c
# bad: [0df162e1377a585ced8adb932f7d6e4164e91ccf] MIPS: mm: Clean up setup of protection map
git bisect bad 0df162e1377a585ced8adb932f7d6e4164e91ccf
# good: [ed2adb74217a4054a92e0a0746e31ec6f5e466c8] MIPS: mm: shorten lines by using macro
git bisect good ed2adb74217a4054a92e0a0746e31ec6f5e466c8
# first bad commit: [0df162e1377a585ced8adb932f7d6e4164e91ccf] MIPS: mm: Clean up setup of protection map