# git gc
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Expanding reachable commits in commit graph: 1305485, done.
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# git rev-parse -q --verify f8eb5bd9a818cc5f2a1e50b22b0091830b28cc36^{commit}
f8eb5bd9a818cc5f2a1e50b22b0091830b28cc36
already have revision, skipping fetch
# git checkout -q -f -B kisskb f8eb5bd9a818cc5f2a1e50b22b0091830b28cc36
# git clean -qxdf
# < git log -1
# commit f8eb5bd9a818cc5f2a1e50b22b0091830b28cc36
# Author: Linus Torvalds <torvalds@linux-foundation.org>
# Date:   Mon Sep 23 08:58:31 2024 -0700
# 
#     mm: fix build on 32-bit targets without MAX_PHYSMEM_BITS
#     
#     The merge resolution to deal with the conflict between commits
#     ea72ce5da228 ("x86/kaslr: Expose and use the end of the physical memory
#     address space") and 99185c10d5d9 ("resource, kunit: add test case for
#     region_intersects()") ended up being broken in configurations didn't
#     define a MAX_PHYSMEM_BITS and that had a 32-bit 'phys_addr_t'.
#     
#     The fallback to using all bits set (ie "(-1ULL)") ended up causing a
#     build error:
#     
#         kernel/resource.c: In function ‘gfr_start’:
#         include/linux/minmax.h:93:30: error: conversion from ‘long long unsigned int’ to ‘resource_size_t’ {aka ‘unsigned int’} changes value from ‘18446744073709551615’ to ‘4294967295’ [-Werror=overflow]
#     
#     this was reported by Geert for m68k, but he points out that it happens
#     on other 32-bit architectures too, eg mips, xtensa, parisc, and powerpc.
#     
#     Limiting 'PHYSMEM_END' to a 'phys_addr_t' (which is the same as
#     'resource_size_t') fixes the build, but Geert points out that it will
#     then cause a silent overflow in mm/sparse.c:
#     
#             unsigned long max_sparsemem_pfn = (PHYSMEM_END + 1) >> PAGE_SHIFT;
#     
#     so we actually do want PHYSMEM_END to be defined a 64-bit type - just
#     not all ones, and not larger than 'phys_addr_t'.
#     
#     The proper fix is probably to not have some kind of default fallback at
#     all, but just make sure every architecture has a valid MAX_PHYSMEM_BITS.
#     But in the meantime, this just applies the rule that PHYSMEM_END is the
#     largest value that fits in a 'phys_addr_t', but does not have the high
#     bit set in 64 bits.
#     
#     Ugly, ugly.
#     
#     Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
#     Cc: Andrew Morton <akpm@linux-foundation.org>
#     Cc: Huang Ying <ying.huang@intel.com>
#     Cc: Thomas Gleixner <tglx@linutronix.de>
#     Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
# < /opt/cross/kisskb/korg/gcc-13.1.0-nolibc/m68k-linux/bin/m68k-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-13.1.0-nolibc/m68k-linux/bin/m68k-linux-ld --version
# < git log --format=%s --max-count=1 f8eb5bd9a818cc5f2a1e50b22b0091830b28cc36
# make -s -j 160 ARCH=m68k O=/kisskb/build/linus_sun3_defconfig_m68k-gcc13 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-13.1.0-nolibc/m68k-linux/bin/m68k-linux-  sun3_defconfig

WARNING: unmet direct dependencies detected for GET_FREE_REGION
  Depends on [n]: SPARSEMEM [=n]
  Selected by [m]:
  - RESOURCE_KUNIT_TEST [=m] && RUNTIME_TESTING_MENU [=y] && KUNIT [=m]

WARNING: unmet direct dependencies detected for GET_FREE_REGION
  Depends on [n]: SPARSEMEM [=n]
  Selected by [m]:
  - RESOURCE_KUNIT_TEST [=m] && RUNTIME_TESTING_MENU [=y] && KUNIT [=m]
# < make -s -j 160 ARCH=m68k O=/kisskb/build/linus_sun3_defconfig_m68k-gcc13 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-13.1.0-nolibc/m68k-linux/bin/m68k-linux-  help
# make -s -j 160 ARCH=m68k O=/kisskb/build/linus_sun3_defconfig_m68k-gcc13 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-13.1.0-nolibc/m68k-linux/bin/m68k-linux-  olddefconfig

WARNING: unmet direct dependencies detected for GET_FREE_REGION
  Depends on [n]: SPARSEMEM [=n]
  Selected by [m]:
  - RESOURCE_KUNIT_TEST [=m] && RUNTIME_TESTING_MENU [=y] && KUNIT [=m]

WARNING: unmet direct dependencies detected for GET_FREE_REGION
  Depends on [n]: SPARSEMEM [=n]
  Selected by [m]:
  - RESOURCE_KUNIT_TEST [=m] && RUNTIME_TESTING_MENU [=y] && KUNIT [=m]
# make -s -j 160 ARCH=m68k O=/kisskb/build/linus_sun3_defconfig_m68k-gcc13 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-13.1.0-nolibc/m68k-linux/bin/m68k-linux-  
Completed OK
# rm -rf /kisskb/build/linus_sun3_defconfig_m68k-gcc13
# Build took: 0:09:19.869652