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mm: fix build on 32-bit targets without MAX_PHYSMEM_BITS

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The merge resolution to deal with the conflict between commits
ea72ce5da2 ("x86/kaslr: Expose and use the end of the physical memory
address space") and 99185c10d5 ("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>
This commit is contained in:
Linus Torvalds 2024-09-23 08:58:31 -07:00
parent 9631042b91
commit f8eb5bd9a8
1 changed files with 1 additions and 1 deletions
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2
include/linux/mm.h
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@ -101,7 +101,7 @@ extern int mmap_rnd_compat_bits __read_mostly;
# ifdef MAX_PHYSMEM_BITS
# define PHYSMEM_END ((1ULL << MAX_PHYSMEM_BITS) - 1)
# else
# define PHYSMEM_END (-1ULL)
# define PHYSMEM_END (((phys_addr_t)-1)&~(1ULL<<63))
# endif
#endif