From: Stefan Agner <stefan@xxxxxxxx> Subject: mm/memblock: introduce PHYS_ADDR_MAX So far code was using ULLONG_MAX and type casting to obtain a phys_addr_t with all bits set. The typecast is necessary to silence compiler warnings on 32-bit platforms. Use the simpler but still type safe approach "~(phys_addr_t)0" to create a preprocessor define for all bits set. Link: http://lkml.kernel.org/r/20180406213809.566-1-stefan@xxxxxxxx Signed-off-by: Stefan Agner <stefan@xxxxxxxx> Suggested-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> Acked-by: Michal Hocko <mhocko@xxxxxxxx> Reviewed-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Cc: Catalin Marinas <catalin.marinas@xxxxxxx> Cc: Pavel Tatashin <pasha.tatashin@xxxxxxxxxx> Cc: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- include/linux/kernel.h | 1 + mm/memblock.c | 22 +++++++++++----------- 2 files changed, 12 insertions(+), 11 deletions(-) diff -puN include/linux/kernel.h~mm-memblock-introduce-phys_addr_max include/linux/kernel.h --- a/include/linux/kernel.h~mm-memblock-introduce-phys_addr_max +++ a/include/linux/kernel.h @@ -29,6 +29,7 @@ #define LLONG_MIN (-LLONG_MAX - 1) #define ULLONG_MAX (~0ULL) #define SIZE_MAX (~(size_t)0) +#define PHYS_ADDR_MAX (~(phys_addr_t)0) #define U8_MAX ((u8)~0U) #define S8_MAX ((s8)(U8_MAX>>1)) diff -puN mm/memblock.c~mm-memblock-introduce-phys_addr_max mm/memblock.c --- a/mm/memblock.c~mm-memblock-introduce-phys_addr_max +++ a/mm/memblock.c @@ -68,7 +68,7 @@ ulong __init_memblock choose_memblock_fl /* adjust *@size so that (@base + *@size) doesn't overflow, return new size */ static inline phys_addr_t memblock_cap_size(phys_addr_t base, phys_addr_t *size) { - return *size = min(*size, (phys_addr_t)ULLONG_MAX - base); + return *size = min(*size, PHYS_ADDR_MAX - base); } /* @@ -925,7 +925,7 @@ void __init_memblock __next_mem_range(u6 r = &type_b->regions[idx_b]; r_start = idx_b ? r[-1].base + r[-1].size : 0; r_end = idx_b < type_b->cnt ? - r->base : (phys_addr_t)ULLONG_MAX; + r->base : PHYS_ADDR_MAX; /* * if idx_b advanced past idx_a, @@ -1041,7 +1041,7 @@ void __init_memblock __next_mem_range_re r = &type_b->regions[idx_b]; r_start = idx_b ? r[-1].base + r[-1].size : 0; r_end = idx_b < type_b->cnt ? - r->base : (phys_addr_t)ULLONG_MAX; + r->base : PHYS_ADDR_MAX; /* * if idx_b advanced past idx_a, * break out to advance idx_a @@ -1516,13 +1516,13 @@ phys_addr_t __init_memblock memblock_end static phys_addr_t __init_memblock __find_max_addr(phys_addr_t limit) { - phys_addr_t max_addr = (phys_addr_t)ULLONG_MAX; + phys_addr_t max_addr = PHYS_ADDR_MAX; struct memblock_region *r; /* * translate the memory @limit size into the max address within one of * the memory memblock regions, if the @limit exceeds the total size - * of those regions, max_addr will keep original value ULLONG_MAX + * of those regions, max_addr will keep original value PHYS_ADDR_MAX */ for_each_memblock(memory, r) { if (limit <= r->size) { @@ -1537,7 +1537,7 @@ static phys_addr_t __init_memblock __fin void __init memblock_enforce_memory_limit(phys_addr_t limit) { - phys_addr_t max_addr = (phys_addr_t)ULLONG_MAX; + phys_addr_t max_addr = PHYS_ADDR_MAX; if (!limit) return; @@ -1545,14 +1545,14 @@ void __init memblock_enforce_memory_limi max_addr = __find_max_addr(limit); /* @limit exceeds the total size of the memory, do nothing */ - if (max_addr == (phys_addr_t)ULLONG_MAX) + if (max_addr == PHYS_ADDR_MAX) return; /* truncate both memory and reserved regions */ memblock_remove_range(&memblock.memory, max_addr, - (phys_addr_t)ULLONG_MAX); + PHYS_ADDR_MAX); memblock_remove_range(&memblock.reserved, max_addr, - (phys_addr_t)ULLONG_MAX); + PHYS_ADDR_MAX); } void __init memblock_cap_memory_range(phys_addr_t base, phys_addr_t size) @@ -1580,7 +1580,7 @@ void __init memblock_cap_memory_range(ph /* truncate the reserved regions */ memblock_remove_range(&memblock.reserved, 0, base); memblock_remove_range(&memblock.reserved, - base + size, (phys_addr_t)ULLONG_MAX); + base + size, PHYS_ADDR_MAX); } void __init memblock_mem_limit_remove_map(phys_addr_t limit) @@ -1593,7 +1593,7 @@ void __init memblock_mem_limit_remove_ma max_addr = __find_max_addr(limit); /* @limit exceeds the total size of the memory, do nothing */ - if (max_addr == (phys_addr_t)ULLONG_MAX) + if (max_addr == PHYS_ADDR_MAX) return; memblock_cap_memory_range(0, max_addr); _ -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
