| Message ID | 1548057848-15136-7-git-send-email-rppt@linux.ibm.com (mailing list archive) |
|---|---|
| State | Not Applicable |
| Headers | show |
| Series | Refine memblock API | expand |
On Mon, Jan 21, 2019 at 10:03:53AM +0200, Mike Rapoport wrote: > diff --git a/arch/arm64/mm/numa.c b/arch/arm64/mm/numa.c > index ae34e3a..2c61ea4 100644 > --- a/arch/arm64/mm/numa.c > +++ b/arch/arm64/mm/numa.c > @@ -237,6 +237,10 @@ static void __init setup_node_data(int nid, u64 start_pfn, u64 end_pfn) > pr_info("Initmem setup node %d [<memory-less node>]\n", nid); > > nd_pa = memblock_phys_alloc_try_nid(nd_size, SMP_CACHE_BYTES, nid); > + if (!nd_pa) > + panic("Cannot allocate %zu bytes for node %d data\n", > + nd_size, nid); > + > nd = __va(nd_pa); > > /* report and initialize */ Does it mean that memblock_phys_alloc_try_nid() never returns valid physical memory starting at 0?
On Fri, Jan 25, 2019 at 05:45:02PM +0000, Catalin Marinas wrote: > On Mon, Jan 21, 2019 at 10:03:53AM +0200, Mike Rapoport wrote: > > diff --git a/arch/arm64/mm/numa.c b/arch/arm64/mm/numa.c > > index ae34e3a..2c61ea4 100644 > > --- a/arch/arm64/mm/numa.c > > +++ b/arch/arm64/mm/numa.c > > @@ -237,6 +237,10 @@ static void __init setup_node_data(int nid, u64 start_pfn, u64 end_pfn) > > pr_info("Initmem setup node %d [<memory-less node>]\n", nid); > > > > nd_pa = memblock_phys_alloc_try_nid(nd_size, SMP_CACHE_BYTES, nid); > > + if (!nd_pa) > > + panic("Cannot allocate %zu bytes for node %d data\n", > > + nd_size, nid); > > + > > nd = __va(nd_pa); > > > > /* report and initialize */ > > Does it mean that memblock_phys_alloc_try_nid() never returns valid > physical memory starting at 0? Yes, it does. memblock_find_in_range_node() that is used by all allocation methods skips the first page [1]. [1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/mm/memblock.c#n257 > -- > Catalin >
Mike Rapoport <rppt@linux.ibm.com> writes: > diff --git a/arch/arm64/mm/numa.c b/arch/arm64/mm/numa.c > index ae34e3a..2c61ea4 100644 > --- a/arch/arm64/mm/numa.c > +++ b/arch/arm64/mm/numa.c > @@ -237,6 +237,10 @@ static void __init setup_node_data(int nid, u64 start_pfn, u64 end_pfn) > pr_info("Initmem setup node %d [<memory-less node>]\n", nid); > > nd_pa = memblock_phys_alloc_try_nid(nd_size, SMP_CACHE_BYTES, nid); > + if (!nd_pa) > + panic("Cannot allocate %zu bytes for node %d data\n", > + nd_size, nid); > + > nd = __va(nd_pa); Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc) cheers
Michael Ellerman <mpe@ellerman.id.au> writes: > Mike Rapoport <rppt@linux.ibm.com> writes: > >> diff --git a/arch/arm64/mm/numa.c b/arch/arm64/mm/numa.c >> index ae34e3a..2c61ea4 100644 >> --- a/arch/arm64/mm/numa.c >> +++ b/arch/arm64/mm/numa.c >> @@ -237,6 +237,10 @@ static void __init setup_node_data(int nid, u64 start_pfn, u64 end_pfn) >> pr_info("Initmem setup node %d [<memory-less node>]\n", nid); >> >> nd_pa = memblock_phys_alloc_try_nid(nd_size, SMP_CACHE_BYTES, nid); >> + if (!nd_pa) >> + panic("Cannot allocate %zu bytes for node %d data\n", >> + nd_size, nid); >> + >> nd = __va(nd_pa); Wrong hunk, O_o > Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc) You know what I mean though :) cheers
diff --git a/arch/arm64/mm/numa.c b/arch/arm64/mm/numa.c index ae34e3a..2c61ea4 100644 --- a/arch/arm64/mm/numa.c +++ b/arch/arm64/mm/numa.c @@ -237,6 +237,10 @@ static void __init setup_node_data(int nid, u64 start_pfn, u64 end_pfn) pr_info("Initmem setup node %d [<memory-less node>]\n", nid); nd_pa = memblock_phys_alloc_try_nid(nd_size, SMP_CACHE_BYTES, nid); + if (!nd_pa) + panic("Cannot allocate %zu bytes for node %d data\n", + nd_size, nid); + nd = __va(nd_pa); /* report and initialize */ diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c index 270cefb..8f2bbe1 100644 --- a/arch/powerpc/mm/numa.c +++ b/arch/powerpc/mm/numa.c @@ -788,6 +788,10 @@ static void __init setup_node_data(int nid, u64 start_pfn, u64 end_pfn) int tnid; nd_pa = memblock_phys_alloc_try_nid(nd_size, SMP_CACHE_BYTES, nid); + if (!nd_pa) + panic("Cannot allocate %zu bytes for node %d data\n", + nd_size, nid); + nd = __va(nd_pa); /* report and initialize */ diff --git a/mm/memblock.c b/mm/memblock.c index f019aee..8aabb1b 100644 --- a/mm/memblock.c +++ b/mm/memblock.c @@ -1393,7 +1393,9 @@ phys_addr_t __init memblock_phys_alloc_try_nid(phys_addr_t size, phys_addr_t ali if (res) return res; - return memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ACCESSIBLE); + return memblock_alloc_range_nid(size, align, 0, + MEMBLOCK_ALLOC_ACCESSIBLE, + NUMA_NO_NODE, MEMBLOCK_NONE); } /**
The memblock_phys_alloc_try_nid() function tries to allocate memory from the requested node and then falls back to allocation from any node in the system. The memblock_alloc_base() fallback used by this function panics if the allocation fails. Replace the memblock_alloc_base() fallback with the direct call to memblock_alloc_range_nid() and update the memblock_phys_alloc_try_nid() callers to check the returned value and panic in case of error. Signed-off-by: Mike Rapoport <rppt@linux.ibm.com> --- arch/arm64/mm/numa.c | 4 ++++ arch/powerpc/mm/numa.c | 4 ++++ mm/memblock.c | 4 +++- 3 files changed, 11 insertions(+), 1 deletion(-)