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s390/boot: Fix physical memory search range

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search_mem_end() calculates the number of 1MB blocks with a signed int
literal. CONFIG_MAX_PHYSMEM_BITS values of 51 and above either overflow
the signed int or shift beyond its width. This produces an invalid search
range when the binary-search memory detection fallback is used.

Use an unsigned long literal so the full supported physical address range
is represented.

Fixes: 54c57795e8 ("s390/mem_detect: replace tprot loop with binary search")
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Vasily Gorbik 2026-08-19 12:30:05 +02:00 committed by Heiko Carstens
parent bb06e5a2a0
commit a0c798ed41
1 changed files with 1 additions and 1 deletions
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2
arch/s390/boot/physmem_info.c
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@ -141,7 +141,7 @@ static int tprot(unsigned long addr)
static unsigned long search_mem_end(void)
{
unsigned long range = 1 << (MAX_PHYSMEM_BITS - 20); /* in 1MB blocks */
unsigned long range = 1UL << (MAX_PHYSMEM_BITS - 20); /* in 1MB blocks */
unsigned long offset = 0;
unsigned long pivot;